resetlogs 打开数据库时新生成日志位置问题
resetlogs打开数据库时新生成日志位置问题若系统中缺少联机日志,以resetlogs方式重建控制文件,那么当我们以alterdatabaseopenresetlogs方式打开数据库时,新生
resetlogs 打开数据库时新生成日志位置问题
若系统中缺少联机日志,以resetlogs方式重建控制文件,那么当我们以alter database open resetlogs方式打开数据库时,新生成的联机日志会位于何处?
一:下面分别讨论几种情况
1 如果在重建控制文件语句中未指定日志条目,未指定omf参数,那么resetlogs 打开数据库时,自动创建的日志位于何处
2 如果在重建控制文件语句中未指定日志条目,仅指定了omf参数db_create_file_dest, 那么resetlogs 打开数据库时,自动创建的日志位于何处
3 如果在重建控制文件语句中指定了日志条目,指定了omf参数,香港虚拟主机,那么resetlogs 打开数据库事,自动创建的日志位于何处
4 如果在重建控制文件语句中未指定日志条目,指定了omf参数db_create_file_dest和 db_create_online_log_dest_n 那么resetlogs 打开数据库时,自动创建的日志位于何处
二:实验
实验1 重建控制文件语句未指定日志条目,未指定omf参数,那么resetlogs打开数据库后日志位置
1 实验前提
重建控制文件中不指定日志条目语句如下
STARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "ZBCRM" RESETLOGS ARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 292
DATAFILE
'/oracle/CRM/ZBCRM/system01.dbf',
'/oracle/CRM/ZBCRM/sysaux01.dbf',
'/oracle/CRM/ZBCRM/undotbs01.dbf',
'/oracle/CRM/ZBCRM/users01.dbf',
'/oracle/CRM/ZBCRM/sysaux02.dbf'
CHARACTER SET ZHS16GBK
;
参数文件中未指定omf参数
NAME VALUE
---------------------------------------- --------------------------------------------------
db_create_file_dest
db_create_online_log_dest_1
db_create_online_log_dest_2
db_create_online_log_dest_3
db_create_online_log_dest_4
db_create_online_log_dest_5
db_recovery_file_dest
db_recovery_file_dest_size 0
2 过程如下:
SQL> @/oracle/control1.sql
ORACLE instance started.
Total System Global Area 1152450560 bytes
Fixed Size 2225832 bytes
Variable Size 704645464 bytes
Database Buffers 436207616 bytes
Redo Buffers 9371648 bytes
Control file created.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
SQL> alter database open resetlogs;
Database altered.
SQL> select open_mode from v$database;
OPEN_MODE
--------------------
READ WRITE
SQL> col member for a50
SQL> select group#,member from v$logfile;
GROUP# MEMBER
---------- --------------------------------------------------
2 /oracle/app/db1/dbs/log2ZBCRM.dbf
1 /oracle/app/db1/dbs/log1ZBCRM.dbf
结果:当控制文件重建语句中未指定日志条目,也未设置omf参数,那么resetlogs 打开数据库后新创建的日志文件位于dbs目录下。
实验2 重建控制文件语句中未指定了日志位置,指定omf参数,香港服务器,那么resetlogs打开数据库后日志位置
1 实验前提
重建控制文件语句如下
STARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "ZBCRM" RESETLOGS ARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 292
DATAFILE
'/oracle/CRM/ZBCRM/system01.dbf',
'/oracle/CRM/ZBCRM/sysaux01.dbf',
'/oracle/CRM/ZBCRM/undotbs01.dbf',
'/oracle/CRM/ZBCRM/users01.dbf',
'/oracle/CRM/ZBCRM/sysaux02.dbf'
CHARACTER SET ZHS16GBK
;
参数文件中指定omf参数
NAME VALUE
---------------------------------------- ----------------------------------------
db_create_file_dest /oracle/CRM/ZBCRM/
db_create_online_log_dest_1
db_create_online_log_dest_2
db_create_online_log_dest_3
db_create_online_log_dest_4
db_create_online_log_dest_5
db_recovery_file_dest
db_recovery_file_dest_size 0

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