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前言 何为PostgreSQL? PostgreSQL简史 格式约定 更多信息 臭虫汇报指导 I. 教程 章1. 从头开始 1.1. 安装 1.2. 体系基本概念 1.3. 创建一个数据库 1.4. 访问数据库 章2. SQL语言 2.1. 介绍 2.2. 概念 2.3. 创建新表 2.4. 向表中添加行 2.5. 查询一个表 2.6. 表间链接 2.7. 聚集函数 2.8. 更新 2.9. 删除 章3. 高级特性 3.1. 介绍 3.2. 视图 3.3. 外键 3.4. 事务 3.5. 窗口函数 3.6. 继承 3.7. 结论 II. SQL语言 章4. SQL语法 4.1. 词法结构 4.2. 值表达式 4.3. 调用函数 章5. 数据定义 5.1. 表的基本概念 5.2. 缺省值 5.3. 约束 5.4. 系统字段 5.5. 修改表 5.6. 权限 5.7. 模式 5.8. 继承 5.9. 分区 5.10. 其它数据库对象 5.11. 依赖性跟踪 章 6. 数据操作 6.1. 插入数据 6.2. 更新数据 6.3. 删除数据 章7. 查询 7.1. 概述 7.2. 表表达式 7.3. 选择列表 7.4. 组合查询 7.5. 行排序 7.6. LIMIT和OFFSET 7.7. VALUES列表 7.8. WITH的查询(公用表表达式) 章8. 数据类型 8.1. 数值类型 8.2. 货币类型 8.3. 字符类型 8.4. 二进制数据类型 8.5. 日期/时间类型 8.6. 布尔类型 8.7. 枚举类型 8.8. 几何类型 8.9. 网络地址类型 8.10. 位串类型 8.11. 文本搜索类型 8.12. UUID类型 8.13. XML类型 8.14. 数组 8.15. 复合类型 8.16. 对象标识符类型 8.17. 伪类型 章 9. 函数和操作符 9.1. 逻辑操作符 9.2. 比较操作符 9.3. 数学函数和操作符 9.4. 字符串函数和操作符 9.5. 二进制字符串函数和操作符 9.6. 位串函数和操作符 9.7. 模式匹配 9.8. 数据类型格式化函数 9.9. 时间/日期函数和操作符 9.10. 支持枚举函数 9.11. 几何函数和操作符 9.12. 网络地址函数和操作符 9.13. 文本检索函数和操作符 9.14. XML函数 9.15. 序列操作函数 9.16. 条件表达式 9.17. 数组函数和操作符 9.18. 聚合函数 9.19. 窗口函数 9.20. 子查询表达式 9.21. 行和数组比较 9.22. 返回集合的函数 9.23. 系统信息函数 9.24. 系统管理函数 9.25. 触发器函数 章10. 类型转换 10.3. 函数 10.2. 操作符 10.1. 概述 10.4. 值存储 10.5. UNION 章11. 索引 11.1. 介绍 11.2. 索引类型 11.3. 多字段索引 11.4. 索引和ORDER BY 11.5. 组合多个索引 11.6. 唯一索引 11.7. 表达式上的索引 11.8. 部分索引 11.9. 操作类和操作簇 11.10. 检查索引的使用 章12. Full Text Search 12.1. Introduction 12.2. Tables and Indexes 12.3. Controlling Text Search 12.4. Additional Features 12.5. Parsers 12.6. Dictionaries 12.7. Configuration Example 12.8. Testing and Debugging Text Search 12.9. GiST and GIN Index Types 12.10. psql Support 12.11. Limitations 12.12. Migration from Pre-8.3 Text Search 章13. 并发控制 13.1. 介绍 13.2. 事务隔离 13.3. 明确锁定 13.4. 应用层数据完整性检查 13.5. 锁和索引 章14. 性能提升技巧 14.1. 使用EXPLAIN 14.2. 规划器使用的统计信息 14.3. 用明确的JOIN语句控制规划器 14.4. 向数据库中添加记录 14.5. 非持久性设置 III. 服务器管理 章15. 安装指导 15.1. 简版 15.2. 要求 15.3. 获取源码 15.4. 升级 15.5. 安装过程 15.6. 安装后的设置 15.7. 支持的平台 15.8. 特殊平台的要求 章16. Installation from Source Code on Windows 16.1. Building with Visual C++ or the Platform SDK 16.2. Building libpq with Visual C++ or Borland C++ 章17. 服务器安装和操作 17.1. PostgreSQL用户帐户 17.2. 创建数据库集群 17.3. 启动数据库服务器 17.4. 管理内核资源 17.5. 关闭服务 17.6. 防止服务器欺骗 17.7. 加密选项 17.8. 用SSL进行安全的TCP/IP连接 17.9. Secure TCP/IP Connections with SSH Tunnels 章18. 服务器配置 18.1. 设置参数 18.2. 文件位置 18.3. 连接和认证 18.4. 资源消耗 18.5. 预写式日志 18.6. 查询规划 18.7. 错误报告和日志 18.8. 运行时统计 18.9. 自动清理 18.10. 客户端连接缺省 18.12. 版本和平台兼容性 18.11. 锁管理 18.13. 预置选项 18.14. 自定义的选项 18.15. 开发人员选项 18.16. 短选项 章19. 用户认证 19.1. pg_hba.conf 文件 19.2. 用户名映射 19.3. 认证方法 19.4. 用户认证 章20. 数据库角色和权限 20.1. 数据库角色 20.2. 角色属性 20.3. 权限 20.4. 角色成员 20.5. 函数和触发器 章21. 管理数据库 21.1. 概述 21.2. 创建一个数据库 21.3. 临时库 21.4. 数据库配置 21.5. 删除数据库 21.6. 表空间 章22. 本土化 22.1. 区域支持 22.2. 字符集支持 章23. 日常数据库维护工作 23.1. Routine Vacuuming日常清理 23.2. 经常重建索引 23.3. 日志文件维护 章24. 备份和恢复 24.1. SQL转储 24.2. 文件系统级别的备份 24.3. 在线备份以及即时恢复(PITR) 24.4. 版本间迁移 章25. 高可用性与负载均衡,复制 25.1. 不同解决方案的比较 25.2. 日志传送备份服务器 25.3. 失效切换 25.4. 日志传送的替代方法 25.5. 热备 章26. 恢复配置 26.1. 归档恢复设置 26.2. 恢复目标设置 26.3. 备服务器设置 章27. 监控数据库的活动 27.1. 标准Unix工具 27.2. 统计收集器 27.3. 查看锁 27.4. 动态跟踪 章28. 监控磁盘使用情况 28.1. 判断磁盘的使用量 28.2. 磁盘满导致的失效 章29. 可靠性和预写式日志 29.1. 可靠性 29.2. 预写式日志(WAL) 29.3. 异步提交 29.4. WAL配置 29.5. WAL内部 章30. Regression Tests 30.1. Running the Tests 30.2. Test Evaluation 30.3. Variant Comparison Files 30.4. Test Coverage Examination IV. 客户端接口 章31. libpq-C库 31.1. 数据库联接函数 31.2. 连接状态函数 31.3. 命令执行函数 31.4. 异步命令处理 31.5. 取消正在处理的查询 31.6. 捷径接口 31.7. 异步通知 31.8. 与COPY命令相关的函数 31.9. Control Functions 控制函数 31.10. 其他函数 31.11. 注意信息处理 31.12. 事件系统 31.13. 环境变量 31.14. 口令文件 31.15. 连接服务的文件 31.16. LDAP查找连接参数 31.17. SSL支持 31.18. 在多线程程序里的行为 31.19. 制作libpq程序 31.20. 例子程序 章32. 大对象 32.1. 介绍 32.2. 实现特点 32.3. 客户端接口 32.4. 服务器端函数 32.5. 例子程序 章33. ECPG - Embedded SQL in C 33.1. The Concept 33.2. Connecting to the Database Server 33.3. Closing a Connection 33.4. Running SQL Commands 33.5. Choosing a Connection 33.6. Using Host Variables 33.7. Dynamic SQL 33.8. pgtypes library 33.9. Using Descriptor Areas 33.10. Informix compatibility mode 33.11. Error Handling 33.12. Preprocessor directives 33.13. Processing Embedded SQL Programs 33.14. Library Functions 33.15. Internals 章34. 信息模式 34.1. 关于这个模式 34.2. 数据类型 34.3. information_schema_catalog_name 34.4. administrable_role_authorizations 34.5. applicable_roles 34.6. attributes 34.7. check_constraint_routine_usage 34.8. check_constraints 34.9. column_domain_usage 34.10. column_privileges 34.11. column_udt_usage 34.12. 字段 34.13. constraint_column_usage 34.14. constraint_table_usage 34.15. data_type_privileges 34.16. domain_constraints 34.18. domains 34.17. domain_udt_usage 34.19. element_types 34.20. enabled_roles 34.21. foreign_data_wrapper_options 34.22. foreign_data_wrappers 34.23. foreign_server_options 34.24. foreign_servers 34.25. key_column_usage 34.26. parameters 34.27. referential_constraints 34.28. role_column_grants 34.29. role_routine_grants 34.30. role_table_grants 34.31. role_usage_grants 34.32. routine_privileges 34.33. routines 34.34. schemata 34.35. sequences 34.36. sql_features 34.37. sql_implementation_info 34.38. sql_languages 34.39. sql_packages 34.40. sql_parts 34.41. sql_sizing 34.42. sql_sizing_profiles 34.43. table_constraints 34.44. table_privileges 34.45. tables 34.46. triggered_update_columns 34.47. 触发器 34.48. usage_privileges 34.49. user_mapping_options 34.50. user_mappings 34.51. view_column_usage 34.52. view_routine_usage 34.53. view_table_usage 34.54. 视图 V. 服务器端编程 章35. 扩展SQL 35.1. 扩展性是如何实现的 35.2. PostgreSQL类型系统 35.3. User-Defined Functions 35.4. Query Language (SQL) Functions 35.5. Function Overloading 35.6. Function Volatility Categories 35.7. Procedural Language Functions 35.8. Internal Functions 35.9. C-Language Functions 35.10. User-Defined Aggregates 35.11. User-Defined Types 35.12. User-Defined Operators 35.13. Operator Optimization Information 35.14. Interfacing Extensions To Indexes 35.15. 用C++扩展 章36. 触发器 36.1. 触发器行为概述 36.3. 用 C 写触发器 36.2. 数据改变的可视性 36.4. 一个完整的例子 章37. 规则系统 37.1. The Query Tree 37.2. 视图和规则系统 37.3. 在INSERT,UPDATE和DELETE上的规则 37.4. 规则和权限 37.5. 规则和命令状态 37.6. 规则与触发器得比较 章38. Procedural Languages 38.1. Installing Procedural Languages 章39. PL/pgSQL - SQL过程语言 39.1. 概述 39.2. PL/pgSQL的结构 39.3. 声明 39.4. 表达式 39.5. 基本语句 39.6. 控制结构 39.7. 游标 39.8. 错误和消息 39.9. 触发器过程 39.10. PL/pgSQL Under the Hood 39.11. 开发PL/pgSQL的一些提示 39.12. 从OraclePL/SQL 进行移植 章40. PL/Tcl - Tcl Procedural Language 40.1. Overview 40.2. PL/Tcl Functions and Arguments 40.3. Data Values in PL/Tcl 40.4. Global Data in PL/Tcl 40.5. Database Access from PL/Tcl 40.6. Trigger Procedures in PL/Tcl 40.7. Modules and the unknown command 40.8. Tcl Procedure Names 章41. PL/Perl - Perl Procedural Language 41.1. PL/Perl Functions and Arguments 41.2. Data Values in PL/Perl 41.3. Built-in Functions 41.4. Global Values in PL/Perl 41.6. PL/Perl Triggers 41.5. Trusted and Untrusted PL/Perl 41.7. PL/Perl Under the Hood 章42. PL/Python - Python Procedural Language 42.1. Python 2 vs. Python 3 42.2. PL/Python Functions 42.3. Data Values 42.4. Sharing Data 42.5. Anonymous Code Blocks 42.6. Trigger Functions 42.7. Database Access 42.8. Utility Functions 42.9. Environment Variables 章43. Server Programming Interface 43.1. Interface Functions Spi-spi-connect Spi-spi-finish Spi-spi-push Spi-spi-pop Spi-spi-execute Spi-spi-exec Spi-spi-execute-with-args Spi-spi-prepare Spi-spi-prepare-cursor Spi-spi-prepare-params Spi-spi-getargcount Spi-spi-getargtypeid Spi-spi-is-cursor-plan Spi-spi-execute-plan Spi-spi-execute-plan-with-paramlist Spi-spi-execp Spi-spi-cursor-open Spi-spi-cursor-open-with-args Spi-spi-cursor-open-with-paramlist Spi-spi-cursor-find Spi-spi-cursor-fetch Spi-spi-cursor-move Spi-spi-scroll-cursor-fetch Spi-spi-scroll-cursor-move Spi-spi-cursor-close Spi-spi-saveplan 43.2. Interface Support Functions Spi-spi-fname Spi-spi-fnumber Spi-spi-getvalue Spi-spi-getbinval Spi-spi-gettype Spi-spi-gettypeid Spi-spi-getrelname Spi-spi-getnspname 43.3. Memory Management Spi-spi-palloc Spi-realloc Spi-spi-pfree Spi-spi-copytuple Spi-spi-returntuple Spi-spi-modifytuple Spi-spi-freetuple Spi-spi-freetupletable Spi-spi-freeplan 43.4. Visibility of Data Changes 43.5. Examples VI. 参考手册 I. SQL命令 Sql-abort Sql-alteraggregate Sql-alterconversion Sql-alterdatabase Sql-alterdefaultprivileges Sql-alterdomain Sql-alterforeigndatawrapper Sql-alterfunction Sql-altergroup Sql-alterindex Sql-alterlanguage Sql-alterlargeobject Sql-alteroperator Sql-alteropclass Sql-alteropfamily Sql-alterrole Sql-alterschema Sql-altersequence Sql-alterserver Sql-altertable Sql-altertablespace Sql-altertsconfig Sql-altertsdictionary Sql-altertsparser Sql-altertstemplate Sql-altertrigger Sql-altertype Sql-alteruser Sql-alterusermapping Sql-alterview Sql-analyze Sql-begin Sql-checkpoint Sql-close Sql-cluster Sql-comment Sql-commit Sql-commit-prepared Sql-copy Sql-createaggregate Sql-createcast Sql-createconstraint Sql-createconversion Sql-createdatabase Sql-createdomain Sql-createforeigndatawrapper Sql-createfunction Sql-creategroup Sql-createindex Sql-createlanguage Sql-createoperator Sql-createopclass Sql-createopfamily Sql-createrole Sql-createrule Sql-createschema Sql-createsequence Sql-createserver Sql-createtable Sql-createtableas Sql-createtablespace Sql-createtsconfig Sql-createtsdictionary Sql-createtsparser Sql-createtstemplate Sql-createtrigger Sql-createtype Sql-createuser Sql-createusermapping Sql-createview Sql-deallocate Sql-declare Sql-delete Sql-discard Sql-do Sql-dropaggregate Sql-dropcast Sql-dropconversion Sql-dropdatabase Sql-dropdomain Sql-dropforeigndatawrapper Sql-dropfunction Sql-dropgroup Sql-dropindex Sql-droplanguage Sql-dropoperator Sql-dropopclass Sql-dropopfamily Sql-drop-owned Sql-droprole Sql-droprule Sql-dropschema Sql-dropsequence Sql-dropserver Sql-droptable Sql-droptablespace Sql-droptsconfig Sql-droptsdictionary Sql-droptsparser Sql-droptstemplate Sql-droptrigger Sql-droptype Sql-dropuser Sql-dropusermapping Sql-dropview Sql-end Sql-execute Sql-explain Sql-fetch Sql-grant Sql-insert Sql-listen Sql-load Sql-lock Sql-move Sql-notify Sql-prepare Sql-prepare-transaction Sql-reassign-owned Sql-reindex Sql-release-savepoint Sql-reset Sql-revoke Sql-rollback Sql-rollback-prepared Sql-rollback-to Sql-savepoint Sql-select Sql-selectinto Sql-set Sql-set-constraints Sql-set-role Sql-set-session-authorization Sql-set-transaction Sql-show Sql-start-transaction Sql-truncate Sql-unlisten Sql-update Sql-vacuum Sql-values II. 客户端应用程序 App-clusterdb App-createdb App-createlang App-createuser App-dropdb App-droplang App-dropuser App-ecpg App-pgconfig App-pgdump App-pg-dumpall App-pgrestore App-psql App-reindexdb App-vacuumdb III. PostgreSQL服务器应用程序 App-initdb App-pgcontroldata App-pg-ctl App-pgresetxlog App-postgres App-postmaster VII. 内部 章44. PostgreSQL内部概览 44.1. 查询路径 44.2. 连接是如何建立起来的 44.3. 分析器阶段 44.4. ThePostgreSQL规则系统 44.5. 规划器/优化器 44.6. 执行器 章45. 系统表 45.1. 概述 45.2. pg_aggregate 45.3. pg_am 45.4. pg_amop 45.5. pg_amproc 45.6. pg_attrdef 45.7. pg_attribute 45.8. pg_authid 45.9. pg_auth_members 45.10. pg_cast 45.11. pg_class 45.12. pg_constraint 45.13. pg_conversion 45.14. pg_database 45.15. pg_db_role_setting 45.16. pg_default_acl 45.17. pg_depend 45.18. pg_description 45.19. pg_enum 45.20. pg_foreign_data_wrapper 45.21. pg_foreign_server 45.22. pg_index 45.23. pg_inherits 45.24. pg_language 45.25. pg_largeobject 45.26. pg_largeobject_metadata 45.27. pg_namespace 45.28. pg_opclass 45.29. pg_operator 45.30. pg_opfamily 45.31. pg_pltemplate 45.32. pg_proc 45.33. pg_rewrite 45.34. pg_shdepend 45.35. pg_shdescription 45.36. pg_statistic 45.37. pg_tablespace 45.38. pg_trigger 45.39. pg_ts_config 45.40. pg_ts_config_map 45.41. pg_ts_dict 45.42. pg_ts_parser 45.43. pg_ts_template 45.44. pg_type 45.45. pg_user_mapping 45.46. System Views 45.47. pg_cursors 45.48. pg_group 45.49. pg_indexes 45.50. pg_locks 45.51. pg_prepared_statements 45.52. pg_prepared_xacts 45.53. pg_roles 45.54. pg_rules 45.55. pg_settings 45.56. pg_shadow 45.57. pg_stats 45.58. pg_tables 45.59. pg_timezone_abbrevs 45.60. pg_timezone_names 45.61. pg_user 45.62. pg_user_mappings 45.63. pg_views 章46. Frontend/Backend Protocol 46.1. Overview 46.2. Message Flow 46.3. Streaming Replication Protocol 46.4. Message Data Types 46.5. Message Formats 46.6. Error and Notice Message Fields 46.7. Summary of Changes since Protocol 2.0 47. PostgreSQL Coding Conventions 47.1. Formatting 47.2. Reporting Errors Within the Server 47.3. Error Message Style Guide 章48. Native Language Support 48.1. For the Translator 48.2. For the Programmer 章49. Writing A Procedural Language Handler 章50. Genetic Query Optimizer 50.1. Query Handling as a Complex Optimization Problem 50.2. Genetic Algorithms 50.3. Genetic Query Optimization (GEQO) in PostgreSQL 50.4. Further Reading 章51. 索引访问方法接口定义 51.1. 索引的系统表记录 51.2. 索引访问方法函数 51.3. 索引扫描 51.4. 索引锁的考量 51.5. 索引唯一性检查 51.6. 索引开销估计函数 章52. GiST Indexes 52.1. Introduction 52.2. Extensibility 52.3. Implementation 52.4. Examples 52.5. Crash Recovery 章53. GIN Indexes 53.1. Introduction 53.2. Extensibility 53.3. Implementation 53.4. GIN tips and tricks 53.5. Limitations 53.6. Examples 章54. 数据库物理存储 54.1. 数据库文件布局 54.2. TOAST 54.3. 自由空间映射 54.4. 可见映射 54.5. 数据库分页文件 章55. BKI后端接口 55.1. BKI 文件格式 55.2. BKI命令 55.3. 系统初始化的BKI文件的结构 55.4. 例子 章56. 规划器如何使用统计信息 56.1. 行预期的例子 VIII. 附录 A. PostgreSQL错误代码 B. 日期/时间支持 B.1. 日期/时间输入解析 B.2. 日期/时间关键字 B.3. 日期/时间配置文件 B.4. 日期单位的历史 C. SQL关键字 D. SQL Conformance D.1. Supported Features D.2. Unsupported Features E. 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E.103. Release 8.0

Release date: 2005-01-19

E.103.1. Overview

Major changes in this release:

Microsoft Windows Native Server

This is the first PostgreSQL release to run natively on Microsoft Windows® as a server. It can run as a Windows service. This release supports NT-based Windows releases like Windows 2000 SP4, Windows XP, and Windows 2003. Older releases like Windows 95, Windows 98, and Windows ME are not supported because these operating systems do not have the infrastructure to support PostgreSQL. A separate installer project has been created to ease installation on Windows — see http://www.postgresql.org/ftp/win32/.

Although tested throughout our release cycle, the Windows port does not have the benefit of years of use in production environments that PostgreSQL has on Unix platforms. Therefore it should be treated with the same level of caution as you would a new product.

Previous releases required the Unix emulation toolkit Cygwin in order to run the server on Windows operating systems. PostgreSQL has supported native clients on Windows for many years.

Savepoints

Savepoints allow specific parts of a transaction to be aborted without affecting the remainder of the transaction. Prior releases had no such capability; there was no way to recover from a statement failure within a transaction except by aborting the whole transaction. This feature is valuable for application writers who require error recovery within a complex transaction.

Point-In-Time Recovery

In previous releases there was no way to recover from disk drive failure except to restore from a previous backup or use a standby replication server. Point-in-time recovery allows continuous backup of the server. You can recover either to the point of failure or to some transaction in the past.

Tablespaces

Tablespaces allow administrators to select different file systems for storage of individual tables, indexes, and databases. This improves performance and control over disk space usage. Prior releases used initlocation and manual symlink management for such tasks.

Improved Buffer Management, CHECKPOINT, VACUUM

This release has a more intelligent buffer replacement strategy, which will make better use of available shared buffers and improve performance. The performance impact of vacuum and checkpoints is also lessened.

Change Column Types

A column's data type can now be changed with ALTER TABLE.

New Perl Server-Side Language

A new version of the plperl server-side language now supports a persistent shared storage area, triggers, returning records and arrays of records, and SPI calls to access the database.

Comma-separated-value (CSV) support in COPY

COPY can now read and write comma-separated-value files. It has the flexibility to interpret nonstandard quoting and separation characters too.

E.103.2. Migration to Version 8.0

A dump/restore using pg_dump is required for those wishing to migrate data from any previous release.

Observe the following incompatibilities:

  • In READ COMMITTED serialization mode, volatile functions now see the results of concurrent transactions committed up to the beginning of each statement within the function, rather than up to the beginning of the interactive command that called the function.

  • Functions declared STABLE or IMMUTABLE always use the snapshot of the calling query, and therefore do not see the effects of actions taken after the calling query starts, whether in their own transaction or other transactions. Such a function must be read-only, too, meaning that it cannot use any SQL commands other than SELECT.

  • Nondeferred AFTER triggers are now fired immediately after completion of the triggering query, rather than upon finishing the current interactive command. This makes a difference when the triggering query occurred within a function: the trigger is invoked before the function proceeds to its next operation.

  • Server configuration parameters virtual_host and tcpip_socket have been replaced with a more general parameter listen_addresses. Also, the server now listens on localhost by default, which eliminates the need for the -i postmaster switch in many scenarios.

  • Server configuration parameters SortMem and VacuumMem have been renamed to work_mem and maintenance_work_mem to better reflect their use. The original names are still supported in SET and SHOW.

  • Server configuration parameters log_pid, log_timestamp, and log_source_port have been replaced with a more general parameter log_line_prefix.

  • Server configuration parameter syslog has been replaced with a more logical log_destination variable to control the log output destination.

  • Server configuration parameter log_statement has been changed so it can selectively log just database modification or data definition statements. Server configuration parameter log_duration now prints only when log_statement prints the query.

  • Server configuration parameter max_expr_depth parameter has been replaced with max_stack_depth which measures the physical stack size rather than the expression nesting depth. This helps prevent session termination due to stack overflow caused by recursive functions.

  • The length() function no longer counts trailing spaces in CHAR(n) values.

  • Casting an integer to BIT(N) selects the rightmost N bits of the integer, not the leftmost N bits as before.

  • Updating an element or slice of a NULL array value now produces a nonnull array result, namely an array containing just the assigned-to positions.

  • Syntax checking of array input values has been tightened up considerably. Junk that was previously allowed in odd places with odd results now causes an error. Empty-string element values must now be written as "", rather than writing nothing. Also changed behavior with respect to whitespace surrounding array elements: trailing whitespace is now ignored, for symmetry with leading whitespace (which has always been ignored).

  • Overflow in integer arithmetic operations is now detected and reported as an error.

  • The arithmetic operators associated with the single-byte "char" data type have been removed.

  • The extract() function (also called date_part) now returns the proper year for BC dates. It previously returned one less than the correct year. The function now also returns the proper values for millennium and century.

  • CIDR values now must have their nonmasked bits be zero. For example, we no longer allow 204.248.199.1/31 as a CIDR value. Such values should never have been accepted by PostgreSQL and will now be rejected.

  • EXECUTE now returns a completion tag that matches the executed statement.

  • psql's \copy command now reads or writes to the query's stdin/stdout, rather than psql's stdin/stdout. The previous behavior can be accessed via new pstdin/pstdout parameters.

  • The JDBC client interface has been removed from the core distribution, and is now hosted at http://jdbc.postgresql.org.

  • The Tcl client interface has also been removed. There are several Tcl interfaces now hosted at http://gborg.postgresql.org.

  • The server now uses its own time zone database, rather than the one supplied by the operating system. This will provide consistent behavior across all platforms. In most cases, there should be little noticeable difference in time zone behavior, except that the time zone names used by SET/SHOW TimeZone might be different from what your platform provides.

  • Configure's threading option no longer requires users to run tests or edit configuration files; threading options are now detected automatically.

  • Now that tablespaces have been implemented, initlocation has been removed.

  • The API for user-defined GiST indexes has been changed. The Union and PickSplit methods are now passed a pointer to a special GistEntryVector structure, rather than a bytea.

E.103.3. Deprecated Features

Some aspects of PostgreSQL's behavior have been determined to be suboptimal. For the sake of backward compatibility these have not been removed in 8.0, but they are considered deprecated and will be removed in the next major release.

  • The 8.1 release will remove the to_char() function for intervals.

  • The server now warns of empty strings passed to oid/float4/float8 data types, but continues to interpret them as zeroes as before. In the next major release, empty strings will be considered invalid input for these data types.

  • By default, tables in PostgreSQL 8.0 and earlier are created with OIDs. In the next release, this will not be the case: to create a table that contains OIDs, the WITH OIDS clause must be specified or the default_with_oids configuration parameter must be set. Users are encouraged to explicitly specify WITH OIDS if their tables require OIDs for compatibility with future releases of PostgreSQL.

E.103.4. Changes

Below you will find a detailed account of the changes between release 8.0 and the previous major release.

E.103.4.1. Performance Improvements

  • Support cross-data-type index usage (Tom)

    Before this change, many queries would not use an index if the data types did not match exactly. This improvement makes index usage more intuitive and consistent.

  • New buffer replacement strategy that improves caching (Jan)

    Prior releases used a least-recently-used (LRU) cache to keep recently referenced pages in memory. The LRU algorithm did not consider the number of times a specific cache entry was accessed, so large table scans could force out useful cache pages. The new cache algorithm uses four separate lists to track most recently used and most frequently used cache pages and dynamically optimize their replacement based on the work load. This should lead to much more efficient use of the shared buffer cache. Administrators who have tested shared buffer sizes in the past should retest with this new cache replacement policy.

  • Add subprocess to write dirty buffers periodically to reduce checkpoint writes (Jan)

    In previous releases, the checkpoint process, which runs every few minutes, would write all dirty buffers to the operating system's buffer cache then flush all dirty operating system buffers to disk. This resulted in a periodic spike in disk usage that often hurt performance. The new code uses a background writer to trickle disk writes at a steady pace so checkpoints have far fewer dirty pages to write to disk. Also, the new code does not issue a global sync() call, but instead fsync()s just the files written since the last checkpoint. This should improve performance and minimize degradation during checkpoints.

  • Add ability to prolong vacuum to reduce performance impact (Jan)

    On busy systems, VACUUM performs many I/O requests which can hurt performance for other users. This release allows you to slow down VACUUM to reduce its impact on other users, though this increases the total duration of VACUUM.

  • Improve B-tree index performance for duplicate keys (Dmitry Tkach, Tom)

    This improves the way indexes are scanned when many duplicate values exist in the index.

  • Use dynamically-generated table size estimates while planning (Tom)

    Formerly the planner estimated table sizes using the values seen by the last VACUUM or ANALYZE, both as to physical table size (number of pages) and number of rows. Now, the current physical table size is obtained from the kernel, and the number of rows is estimated by multiplying the table size by the row density (rows per page) seen by the last VACUUM or ANALYZE. This should produce more reliable estimates in cases where the table size has changed significantly since the last housekeeping command.

  • Improved index usage with OR clauses (Tom)

    This allows the optimizer to use indexes in statements with many OR clauses that would not have been indexed in the past. It can also use multi-column indexes where the first column is specified and the second column is part of an OR clause.

  • Improve matching of partial index clauses (Tom)

    The server is now smarter about using partial indexes in queries involving complex WHERE clauses.

  • Improve performance of the GEQO optimizer (Tom)

    The GEQO optimizer is used to plan queries involving many tables (by default, twelve or more). This release speeds up the way queries are analyzed to decrease time spent in optimization.

  • Miscellaneous optimizer improvements

    There is not room here to list all the minor improvements made, but numerous special cases work better than in prior releases.

  • Improve lookup speed for C functions (Tom)

    This release uses a hash table to lookup information for dynamically loaded C functions. This improves their speed so they perform nearly as quickly as functions that are built into the server executable.

  • Add type-specific ANALYZE statistics capability (Mark Cave-Ayland)

    This feature allows more flexibility in generating statistics for nonstandard data types.

  • ANALYZE now collects statistics for expression indexes (Tom)

    Expression indexes (also called functional indexes) allow users to index not just columns but the results of expressions and function calls. With this release, the optimizer can gather and use statistics about the contents of expression indexes. This will greatly improve the quality of planning for queries in which an expression index is relevant.

  • New two-stage sampling method for ANALYZE (Manfred Koizar)

    This gives better statistics when the density of valid rows is very different in different regions of a table.

  • Speed up TRUNCATE (Tom)

    This buys back some of the performance loss observed in 7.4, while still keeping TRUNCATE transaction-safe.

E.103.4.2. Server Changes

  • Add WAL file archiving and point-in-time recovery (Simon Riggs)

  • Add tablespaces so admins can control disk layout (Gavin)

  • Add a built-in log rotation program (Andreas Pflug)

    It is now possible to log server messages conveniently without relying on either syslog or an external log rotation program.

  • Add new read-only server configuration parameters to show server compile-time settings: block_size, integer_datetimes, max_function_args, max_identifier_length, max_index_keys (Joe)

  • Make quoting of sameuser, samegroup, and all remove special meaning of these terms in pg_hba.conf (Andrew)

  • Use clearer IPv6 name ::1/128 for localhost in default pg_hba.conf (Andrew)

  • Use CIDR format in pg_hba.conf examples (Andrew)

  • Rename server configuration parameters SortMem and VacuumMem to work_mem and maintenance_work_mem (Old names still supported) (Tom)

    This change was made to clarify that bulk operations such as index and foreign key creation use maintenance_work_mem, while work_mem is for workspaces used during query execution.

  • Allow logging of session disconnections using server configuration log_disconnections (Andrew)

  • Add new server configuration parameter log_line_prefix to allow control of information emitted in each log line (Andrew)

    Available information includes user name, database name, remote IP address, and session start time.

  • Remove server configuration parameters log_pid, log_timestamp, log_source_port; functionality superseded by log_line_prefix (Andrew)

  • Replace the virtual_host and tcpip_socket parameters with a unified listen_addresses parameter (Andrew, Tom)

    virtual_host could only specify a single IP address to listen on. listen_addresses allows multiple addresses to be specified.

  • Listen on localhost by default, which eliminates the need for the -i postmaster switch in many scenarios (Andrew)

    Listening on localhost (127.0.0.1) opens no new security holes but allows configurations like Windows and JDBC, which do not support local sockets, to work without special adjustments.

  • Remove syslog server configuration parameter, and add more logical log_destination variable to control log output location (Magnus)

  • Change server configuration parameter log_statement to take values all, mod, ddl, or none to select which queries are logged (Bruce)

    This allows administrators to log only data definition changes or only data modification statements.

  • Some logging-related configuration parameters could formerly be adjusted by ordinary users, but only in the "more verbose" direction. They are now treated more strictly: only superusers can set them. However, a superuser can use ALTER USER to provide per-user settings of these values for non-superusers. Also, it is now possible for superusers to set values of superuser-only configuration parameters via PGOPTIONS.

  • Allow configuration files to be placed outside the data directory (mlw)

    By default, configuration files are kept in the cluster's top directory. With this addition, configuration files can be placed outside the data directory, easing administration.

  • Plan prepared queries only when first executed so constants can be used for statistics (Oliver Jowett)

    Prepared statements plan queries once and execute them many times. While prepared queries avoid the overhead of re-planning on each use, the quality of the plan suffers from not knowing the exact parameters to be used in the query. In this release, planning of unnamed prepared statements is delayed until the first execution, and the actual parameter values of that execution are used as optimization hints. This allows use of out-of-line parameter passing without incurring a performance penalty.

  • Allow DECLARE CURSOR to take parameters (Oliver Jowett)

    It is now useful to issue DECLARE CURSOR in a Parse message with parameters. The parameter values sent at Bind time will be substituted into the execution of the cursor's query.

  • Fix hash joins and aggregates of inet and cidr data types (Tom)

    Release 7.4 handled hashing of mixed inet and cidr values incorrectly. (This bug did not exist in prior releases because they wouldn't try to hash either data type.)

  • Make log_duration print only when log_statement prints the query (Ed L.)

E.103.4.3. Query Changes

  • Add savepoints (nested transactions) (Alvaro)

  • Unsupported isolation levels are now accepted and promoted to the nearest supported level (Peter)

    The SQL specification states that if a database doesn't support a specific isolation level, it should use the next more restrictive level. This change complies with that recommendation.

  • Allow BEGIN WORK to specify transaction isolation levels like START TRANSACTION does (Bruce)

  • Fix table permission checking for cases in which rules generate a query type different from the originally submitted query (Tom)

  • Implement dollar quoting to simplify single-quote usage (Andrew, Tom, David Fetter)

    In previous releases, because single quotes had to be used to quote a function's body, the use of single quotes inside the function text required use of two single quotes or other error-prone notations. With this release we add the ability to use "dollar quoting" to quote a block of text. The ability to use different quoting delimiters at different nesting levels greatly simplifies the task of quoting correctly, especially in complex functions. Dollar quoting can be used anywhere quoted text is needed.

  • Make CASE val WHEN compval1 THEN ... evaluate val only once (Tom)

    CASE no longer evaluates the tested expression multiple times. This has benefits when the expression is complex or is volatile.

  • Test HAVING before computing target list of an aggregate query (Tom)

    Fixes improper failure of cases such as SELECT SUM(win)/SUM(lose) ... GROUP BY ... HAVING SUM(lose) > 0. This should work but formerly could fail with divide-by-zero.

  • Replace max_expr_depth parameter with max_stack_depth parameter, measured in kilobytes of stack size (Tom)

    This gives us a fairly bulletproof defense against crashing due to runaway recursive functions. Instead of measuring the depth of expression nesting, we now directly measure the size of the execution stack.

  • Allow arbitrary row expressions (Tom)

    This release allows SQL expressions to contain arbitrary composite types, that is, row values. It also allows functions to more easily take rows as arguments and return row values.

  • Allow LIKE/ILIKE to be used as the operator in row and subselect comparisons (Fabien Coelho)

  • Avoid locale-specific case conversion of basic ASCII letters in identifiers and keywords (Tom)

    This solves the "Turkish problem" with mangling of words containing I and i. Folding of characters outside the 7-bit-ASCII set is still locale-aware.

  • Improve syntax error reporting (Fabien, Tom)

    Syntax error reports are more useful than before.

  • Change EXECUTE to return a completion tag matching the executed statement (Kris Jurka)

    Previous releases return an EXECUTE tag for any EXECUTE call. In this release, the tag returned will reflect the command executed.

  • Avoid emitting NATURAL CROSS JOIN in rule listings (Tom)

    Such a clause makes no logical sense, but in some cases the rule decompiler formerly produced this syntax.

E.103.4.4. Object Manipulation Changes

  • Add COMMENT ON for casts, conversions, languages, operator classes, and large objects (Christopher)

  • Add new server configuration parameter default_with_oids to control whether tables are created with OIDs by default (Neil)

    This allows administrators to control whether CREATE TABLE commands create tables with or without OID columns by default. (Note: the current factory default setting for default_with_oids is TRUE, but the default will become FALSE in future releases.)

  • Add WITH / WITHOUT OIDS clause to CREATE TABLE AS (Neil)

  • Allow ALTER TABLE DROP COLUMN to drop an OID column (ALTER TABLE SET WITHOUT OIDS still works) (Tom)

  • Allow composite types as table columns (Tom)

  • Allow ALTER ... ADD COLUMN with defaults and NOT NULL constraints; works per SQL spec (Rod)

    It is now possible for ADD COLUMN to create a column that is not initially filled with NULLs, but with a specified default value.

  • Add ALTER COLUMN TYPE to change column's type (Rod)

    It is now possible to alter a column's data type without dropping and re-adding the column.

  • Allow multiple ALTER actions in a single ALTER TABLE command (Rod)

    This is particularly useful for ALTER commands that rewrite the table (which include ALTER COLUMN TYPE and ADD COLUMN with a default). By grouping ALTER commands together, the table need be rewritten only once.

  • Allow ALTER TABLE to add SERIAL columns (Tom)

    This falls out from the new capability of specifying defaults for new columns.

  • Allow changing the owners of aggregates, conversions, databases, functions, operators, operator classes, schemas, types, and tablespaces (Christopher, Euler Taveira de Oliveira)

    Previously this required modifying the system tables directly.

  • Allow temporary object creation to be limited to SECURITY DEFINER functions (Sean Chittenden)

  • Add ALTER TABLE ... SET WITHOUT CLUSTER (Christopher)

    Prior to this release, there was no way to clear an auto-cluster specification except to modify the system tables.

  • Constraint/Index/SERIAL names are now table_column_type with numbers appended to guarantee uniqueness within the schema (Tom)

    The SQL specification states that such names should be unique within a schema.

  • Add pg_get_serial_sequence() to return a SERIAL column's sequence name (Christopher)

    This allows automated scripts to reliably find the SERIAL sequence name.

  • Warn when primary/foreign key data type mismatch requires costly lookup

  • New ALTER INDEX command to allow moving of indexes between tablespaces (Gavin)

  • Make ALTER TABLE OWNER change dependent sequence ownership too (Alvaro)

E.103.4.5. Utility Command Changes

  • Allow CREATE SCHEMA to create triggers, indexes, and sequences (Neil)

  • Add ALSO keyword to CREATE RULE (Fabien Coelho)

    This allows ALSO to be added to rule creation to contrast it with INSTEAD rules.

  • Add NOWAIT option to LOCK (Tatsuo)

    This allows the LOCK command to fail if it would have to wait for the requested lock.

  • Allow COPY to read and write comma-separated-value (CSV) files (Andrew, Bruce)

  • Generate error if the COPY delimiter and NULL string conflict (Bruce)

  • GRANT/REVOKE behavior follows the SQL spec more closely

  • Avoid locking conflict between CREATE INDEX and CHECKPOINT (Tom)

    In 7.3 and 7.4, a long-running B-tree index build could block concurrent CHECKPOINTs from completing, thereby causing WAL bloat because the WAL log could not be recycled.

  • Database-wide ANALYZE does not hold locks across tables (Tom)

    This reduces the potential for deadlocks against other backends that want exclusive locks on tables. To get the benefit of this change, do not execute database-wide ANALYZE inside a transaction block (BEGIN block); it must be able to commit and start a new transaction for each table.

  • REINDEX does not exclusively lock the index's parent table anymore

    The index itself is still exclusively locked, but readers of the table can continue if they are not using the particular index being rebuilt.

  • Erase MD5 user passwords when a user is renamed (Bruce)

    PostgreSQL uses the user name as salt when encrypting passwords via MD5. When a user's name is changed, the salt will no longer match the stored MD5 password, so the stored password becomes useless. In this release a notice is generated and the password is cleared. A new password must then be assigned if the user is to be able to log in with a password.

  • New pg_ctl kill option for Windows (Andrew)

    Windows does not have a kill command to send signals to backends so this capability was added to pg_ctl.

  • Information schema improvements

  • Add --pwfile option to initdb so the initial password can be set by GUI tools (Magnus)

  • Detect locale/encoding mismatch in initdb (Peter)

  • Add register command to pg_ctl to register Windows operating system service (Dave Page)

E.103.4.6. Data Type and Function Changes

  • More complete support for composite types (row types) (Tom)

    Composite values can be used in many places where only scalar values worked before.

  • Reject nonrectangular array values as erroneous (Joe)

    Formerly, array_in would silently build a surprising result.

  • Overflow in integer arithmetic operations is now detected (Tom)

  • The arithmetic operators associated with the single-byte "char" data type have been removed.

    Formerly, the parser would select these operators in many situations where an "unable to select an operator" error would be more appropriate, such as null * null. If you actually want to do arithmetic on a "char" column, you can cast it to integer explicitly.

  • Syntax checking of array input values considerably tightened up (Joe)

    Junk that was previously allowed in odd places with odd results now causes an ERROR, for example, non-whitespace after the closing right brace.

  • Empty-string array element values must now be written as "", rather than writing nothing (Joe)

    Formerly, both ways of writing an empty-string element value were allowed, but now a quoted empty string is required. The case where nothing at all appears will probably be considered to be a NULL element value in some future release.

  • Array element trailing whitespace is now ignored (Joe)

    Formerly leading whitespace was ignored, but trailing whitespace between an element value and the delimiter or right brace was significant. Now trailing whitespace is also ignored.

  • Emit array values with explicit array bounds when lower bound is not one (Joe)

  • Accept YYYY-monthname-DD as a date string (Tom)

  • Make netmask and hostmask functions return maximum-length mask length (Tom)

  • Change factorial function to return numeric (Gavin)

    Returning numeric allows the factorial function to work for a wider range of input values.

  • to_char/to_date() date conversion improvements (Kurt Roeckx, Fabien Coelho)

  • Make length() disregard trailing spaces in CHAR(n) (Gavin)

    This change was made to improve consistency: trailing spaces are semantically insignificant in CHAR(n) data, so they should not be counted by length().

  • Warn about empty string being passed to OID/float4/float8 data types (Neil)

    8.1 will throw an error instead.

  • Allow leading or trailing whitespace in int2/int4/int8/float4/float8 input routines (Neil)

  • Better support for IEEE Infinity and NaN values in float4/float8 (Neil)

    These should now work on all platforms that support IEEE-compliant floating point arithmetic.

  • Add week option to date_trunc() (Robert Creager)

  • Fix to_char for 1 BC (previously it returned 1 AD) (Bruce)

  • Fix date_part(year) for BC dates (previously it returned one less than the correct year) (Bruce)

  • Fix date_part() to return the proper millennium and century (Fabien Coelho)

    In previous versions, the century and millennium results had a wrong number and started in the wrong year, as compared to standard reckoning of such things.

  • Add ceiling() as an alias for ceil(), and power() as an alias for pow() for standards compliance (Neil)

  • Change ln(), log(), power(), and sqrt() to emit the correct SQLSTATE error codes for certain error conditions, as specified by SQL:2003 (Neil)

  • Add width_bucket() function as defined by SQL:2003 (Neil)

  • Add generate_series() functions to simplify working with numeric sets (Joe)

  • Fix upper/lower/initcap() functions to work with multibyte encodings (Tom)

  • Add boolean and bitwise integer AND/OR aggregates (Fabien Coelho)

  • New session information functions to return network addresses for client and server (Sean Chittenden)

  • Add function to determine the area of a closed path (Sean Chittenden)

  • Add function to send cancel request to other backends (Magnus)

  • Add interval plus datetime operators (Tom)

    The reverse ordering, datetime plus interval, was already supported, but both are required by the SQL standard.

  • Casting an integer to BIT(N) selects the rightmost N bits of the integer (Tom)

    In prior releases, the leftmost N bits were selected, but this was deemed unhelpful, not to mention inconsistent with casting from bit to int.

  • Require CIDR values to have all nonmasked bits be zero (Kevin Brintnall)

E.103.4.7. Server-Side Language Changes

  • In READ COMMITTED serialization mode, volatile functions now see the results of concurrent transactions committed up to the beginning of each statement within the function, rather than up to the beginning of the interactive command that called the function.

  • Functions declared STABLE or IMMUTABLE always use the snapshot of the calling query, and therefore do not see the effects of actions taken after the calling query starts, whether in their own transaction or other transactions. Such a function must be read-only, too, meaning that it cannot use any SQL commands other than SELECT. There is a considerable performance gain from declaring a function STABLE or IMMUTABLE rather than VOLATILE.

  • Nondeferred AFTER triggers are now fired immediately after completion of the triggering query, rather than upon finishing the current interactive command. This makes a difference when the triggering query occurred within a function: the trigger is invoked before the function proceeds to its next operation. For example, if a function inserts a new row into a table, any nondeferred foreign key checks occur before proceeding with the function.

  • Allow function parameters to be declared with names (Dennis Björklund)

    This allows better documentation of functions. Whether the names actually do anything depends on the specific function language being used.

  • Allow PL/pgSQL parameter names to be referenced in the function (Dennis Björklund)

    This basically creates an automatic alias for each named parameter.

  • Do minimal syntax checking of PL/pgSQL functions at creation time (Tom)

    This allows us to catch simple syntax errors sooner.

  • More support for composite types (row and record variables) in PL/pgSQL

    For example, it now works to pass a rowtype variable to another function as a single variable.

  • Default values for PL/pgSQL variables can now reference previously declared variables

  • Improve parsing of PL/pgSQL FOR loops (Tom)

    Parsing is now driven by presence of ".." rather than data type of FOR variable. This makes no difference for correct functions, but should result in more understandable error messages when a mistake is made.

  • Major overhaul of PL/Perl server-side language (Command Prompt, Andrew Dunstan)

  • In PL/Tcl, SPI commands are now run in subtransactions. If an error occurs, the subtransaction is cleaned up and the error is reported as an ordinary Tcl error, which can be trapped with catch. Formerly, it was not possible to catch such errors.

  • Accept ELSEIF in PL/pgSQL (Neil)

    Previously PL/pgSQL only allowed ELSIF, but many people are accustomed to spelling this keyword ELSEIF.

E.103.4.8. psql Changes

  • Improve psql information display about database objects (Christopher)

  • Allow psql to display group membership in \du and \dg (Markus Bertheau)

  • Prevent psql \dn from showing temporary schemas (Bruce)

  • Allow psql to handle tilde user expansion for file names (Zach Irmen)

  • Allow psql to display fancy prompts, including color, via readline (Reece Hart, Chet Ramey)

  • Make psql \copy match COPY command syntax fully (Tom)

  • Show the location of syntax errors (Fabien Coelho, Tom)

  • Add CLUSTER information to psql \d display (Bruce)

  • Change psql \copy stdin/stdout to read from command input/output (Bruce)

  • Add pstdin/pstdout to read from psql's stdin/stdout (Mark Feit)

  • Add global psql configuration file, psqlrc.sample (Bruce)

    This allows a central file where global psql startup commands can be stored.

  • Have psql \d+ indicate if the table has an OID column (Neil)

  • On Windows, use binary mode in psql when reading files so control-Z is not seen as end-of-file

  • Have \dn+ show permissions and description for schemas (Dennis Björklund)

  • Improve tab completion support (Stefan Kaltenbrunn, Greg Sabino Mullane)

  • Allow boolean settings to be set using upper or lower case (Michael Paesold)

E.103.4.9. pg_dump Changes

  • Use dependency information to improve the reliability of pg_dump (Tom)

    This should solve the longstanding problems with related objects sometimes being dumped in the wrong order.

  • Have pg_dump output objects in alphabetical order if possible (Tom)

    This should make it easier to identify changes between dump files.

  • Allow pg_restore to ignore some SQL errors (Fabien Coelho)

    This makes pg_restore's behavior similar to the results of feeding a pg_dump output script to psql. In most cases, ignoring errors and plowing ahead is the most useful thing to do. Also added was a pg_restore option to give the old behavior of exiting on an error.

  • pg_restore -l display now includes objects' schema names

  • New begin/end markers in pg_dump text output (Bruce)

  • Add start/stop times for pg_dump/pg_dumpall in verbose mode (Bruce)

  • Allow most pg_dump options in pg_dumpall (Christopher)

  • Have pg_dump use ALTER OWNER rather than SET SESSION AUTHORIZATION by default (Christopher)

E.103.4.10. libpq Changes

  • Make libpq's SIGPIPE handling thread-safe (Bruce)

  • Add PQmbdsplen() which returns the display length of a character (Tatsuo)

  • Add thread locking to SSL and Kerberos connections (Manfred Spraul)

  • Allow PQoidValue(), PQcmdTuples(), and PQoidStatus() to work on EXECUTE commands (Neil)

  • Add PQserverVersion() to provide more convenient access to the server version number (Greg Sabino Mullane)

  • Add PQprepare/PQsendPrepared() functions to support preparing statements without necessarily specifying the data types of their parameters (Abhijit Menon-Sen)

  • Many ECPG improvements, including SET DESCRIPTOR (Michael)

E.103.4.11. Source Code Changes

  • Allow the database server to run natively on Windows (Claudio, Magnus, Andrew)

  • Shell script commands converted to C versions for Windows support (Andrew)

  • Create an extension makefile framework (Fabien Coelho, Peter)

    This simplifies the task of building extensions outside the original source tree.

  • Support relocatable installations (Bruce)

    Directory paths for installed files (such as the /share directory) are now computed relative to the actual location of the executables, so that an installation tree can be moved to another place without reconfiguring and rebuilding.

  • Use --with-docdir to choose installation location of documentation; also allow --infodir (Peter)

  • Add --without-docdir to prevent installation of documentation (Peter)

  • Upgrade to DocBook V4.2 SGML (Peter)

  • New PostgreSQL CVS tag (Marc)

    This was done to make it easier for organizations to manage their own copies of the PostgreSQL CVS repository. File version stamps from the master repository will not get munged by checking into or out of a copied repository.

  • Clarify locking code (Manfred Koizar)

  • Buffer manager cleanup (Neil)

  • Decouple platform tests from CPU spinlock code (Bruce, Tom)

  • Add inlined test-and-set code on PA-RISC for gcc (ViSolve, Tom)

  • Improve i386 spinlock code (Manfred Spraul)

  • Clean up spinlock assembly code to avoid warnings from newer gcc releases (Tom)

  • Remove JDBC from source tree; now a separate project

  • Remove the libpgtcl client interface; now a separate project

  • More accurately estimate memory and file descriptor usage (Tom)

  • Improvements to the Mac OS X startup scripts (Ray A.)

  • New fsync() test program (Bruce)

  • Major documentation improvements (Neil, Peter)

  • Remove pg_encoding; not needed anymore

  • Remove pg_id; not needed anymore

  • Remove initlocation; not needed anymore

  • Auto-detect thread flags (no more manual testing) (Bruce)

  • Use Olson's public domain timezone library (Magnus)

  • With threading enabled, use thread flags on Unixware for backend executables too (Bruce)

    Unixware cannot mix threaded and nonthreaded object files in the same executable, so everything must be compiled as threaded.

  • psql now uses a flex-generated lexical analyzer to process command strings

  • Reimplement the linked list data structure used throughout the backend (Neil)

    This improves performance by allowing list append and length operations to be more efficient.

  • Allow dynamically loaded modules to create their own server configuration parameters (Thomas Hallgren)

  • New Brazilian version of FAQ (Euler Taveira de Oliveira)

  • Add French FAQ (Guillaume Lelarge)

  • New pgevent for Windows logging

  • Make libpq and ECPG build as proper shared libraries on OS X (Tom)

E.103.4.12. Contrib Changes

  • Overhaul of contrib/dblink (Joe)

  • contrib/dbmirror improvements (Steven Singer)

  • New contrib/xml2 (John Gray, Torchbox)

  • Updated contrib/mysql

  • New version of contrib/btree_gist (Teodor)

  • New contrib/trgm, trigram matching for PostgreSQL (Teodor)

  • Many contrib/tsearch2 improvements (Teodor)

  • Add double metaphone to contrib/fuzzystrmatch (Andrew)

  • Allow contrib/pg_autovacuum to run as a Windows service (Dave Page)

  • Add functions to contrib/dbsize (Andreas Pflug)

  • Removed contrib/pg_logger: obsoleted by integrated logging subprocess

  • Removed contrib/rserv: obsoleted by various separate projects

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