Home Database Mysql Tutorial mysql提示[Warning] Invalid (old?) table or database name问题_MySQL

mysql提示[Warning] Invalid (old?) table or database name问题_MySQL

Jun 01, 2016 pm 01:23 PM
mysql

bitsCN.com DROP TABLE IF EXISTS [TEMP_TABLE_NAME];
create temporary table [TEMP_TABLE_NAME] select col1,col2,... from [TABLE_NAME];
alter table [TEMP_TABLE_NAME] add unique idx_col1(col1);
经过以上操作中,多次出现该warning问题。通过查询和跟踪调试源码,有以下线索和处理方式:
mysql的"[Warning] Invalid (old?) table or database name"问题出现位置:

sql_table.cc:279
uint explain_filename (THD* thd, const char *from, char *to , uint to_length , enum_explain_filename_mode explain_mode )

跟踪代码发现,只有在ha_innodb.cc:1946的innobase_convert_identifier 中调用explain_filename函数。

/*****************************************************************//**
Convert an SQL identifier to the MySQL system_charset_info (UTF-8)
and quote it if needed.
@return pointer to the end of buf */
static char* innobase_convert_identifier (
/*========================*/
char* buf, /*!ulint buflen, /*!const char * id, /*!ulint idlen, /*!void* thd, /*!ibool file_id) /*!FALSE=id is an UTF-8 string */

顺着线索向上查找,发现在有两个位置调用了innobase_convert_identifier 函数,分两个线索继续查找。

线索一:
ha_innodb.cc:2034
调用innodb_convert_identifier函数

/*****************************************************************//**
Convert a table or index name to the MySQL system_charset_info (UTF-8)
and quote it if needed.
@return pointer to the end of buf */
extern "C" UNIV_INTERN char* innobase_convert_name (
/*==================*/
char* buf, /*!ulint buflen, /*!const char * id, /*!ulint idlen, /*!void* thd, /*!ibool table_id) /*!FALSE=id is an index name */

从函数定义和函数功能来看,该函数是将mysql的表名或者索引名转换成utf8,与字符集相关。查看现有数据库字符集和生成的临时表字符集均为lanti1,推断是可能的原因之一。
处理方式:
修改数据库的字符集为utf8,观察数据库是否仍然出现该错误。

线索二:

ha_innodb.cc:6269
调用innodb_convert_identifier函数
/*****************************************************************//**
Creates a table definition to an InnoDB database. */
static create_table_def (
/*=============*/
trx_t* trx, /*!TABLE* form, /*!columns and indexes */
const char * table_name, /*!const char * path_of_temp_table, /*!created by the user with the
TEMPORARY keyword, then this
parameter is the dir path where the
table should be placed if we create
an .ibd file for it (no .ibd extension
in the path, though); otherwise this
is NULL */
ulint flags) /*!
在create_table_def 函数中,调用row_create_table_for_mysql函数后,当返回值为DB_DUPLICATE_KEY时,调用innodb_convert_identifier,从而触发该warning。

row0mysql.c:1820
UNIV_INTERN int row_create_table_for_mysql(
/*=======================*/
dict_table_t* table, /*!(will be freed) */
trx_t* trx) /*!
该函数中调用了更深层次的函数,但从调试代码来看,暂时没有发现导致该问题的点。
处理方式:
在线索一中的处理方式不能解决问题的情况下,再进行进一步的代码分析。
总结:
经过以上代码调试和分析,得出两条线索,但是一直未能重现该问题。因此,目前只能对现有服务器进行线索一的处理。如果按照线索一处理方式处理后,仍然出现该问题,将对第二步进行深入的分析。

作者 king_wanghengbitsCN.com

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP's big data structure processing skills PHP's big data structure processing skills May 08, 2024 am 10:24 AM

Big data structure processing skills: Chunking: Break down the data set and process it in chunks to reduce memory consumption. Generator: Generate data items one by one without loading the entire data set, suitable for unlimited data sets. Streaming: Read files or query results line by line, suitable for large files or remote data. External storage: For very large data sets, store the data in a database or NoSQL.

How to optimize MySQL query performance in PHP? How to optimize MySQL query performance in PHP? Jun 03, 2024 pm 08:11 PM

MySQL query performance can be optimized by building indexes that reduce lookup time from linear complexity to logarithmic complexity. Use PreparedStatements to prevent SQL injection and improve query performance. Limit query results and reduce the amount of data processed by the server. Optimize join queries, including using appropriate join types, creating indexes, and considering using subqueries. Analyze queries to identify bottlenecks; use caching to reduce database load; optimize PHP code to minimize overhead.

How to use MySQL backup and restore in PHP? How to use MySQL backup and restore in PHP? Jun 03, 2024 pm 12:19 PM

Backing up and restoring a MySQL database in PHP can be achieved by following these steps: Back up the database: Use the mysqldump command to dump the database into a SQL file. Restore database: Use the mysql command to restore the database from SQL files.

How to insert data into a MySQL table using PHP? How to insert data into a MySQL table using PHP? Jun 02, 2024 pm 02:26 PM

How to insert data into MySQL table? Connect to the database: Use mysqli to establish a connection to the database. Prepare the SQL query: Write an INSERT statement to specify the columns and values ​​to be inserted. Execute query: Use the query() method to execute the insertion query. If successful, a confirmation message will be output.

How to fix mysql_native_password not loaded errors on MySQL 8.4 How to fix mysql_native_password not loaded errors on MySQL 8.4 Dec 09, 2024 am 11:42 AM

One of the major changes introduced in MySQL 8.4 (the latest LTS release as of 2024) is that the "MySQL Native Password" plugin is no longer enabled by default. Further, MySQL 9.0 removes this plugin completely. This change affects PHP and other app

How to use MySQL stored procedures in PHP? How to use MySQL stored procedures in PHP? Jun 02, 2024 pm 02:13 PM

To use MySQL stored procedures in PHP: Use PDO or the MySQLi extension to connect to a MySQL database. Prepare the statement to call the stored procedure. Execute the stored procedure. Process the result set (if the stored procedure returns results). Close the database connection.

How to create a MySQL table using PHP? How to create a MySQL table using PHP? Jun 04, 2024 pm 01:57 PM

Creating a MySQL table using PHP requires the following steps: Connect to the database. Create the database if it does not exist. Select a database. Create table. Execute the query. Close the connection.

The difference between oracle database and mysql The difference between oracle database and mysql May 10, 2024 am 01:54 AM

Oracle database and MySQL are both databases based on the relational model, but Oracle is superior in terms of compatibility, scalability, data types and security; while MySQL focuses on speed and flexibility and is more suitable for small to medium-sized data sets. . ① Oracle provides a wide range of data types, ② provides advanced security features, ③ is suitable for enterprise-level applications; ① MySQL supports NoSQL data types, ② has fewer security measures, and ③ is suitable for small to medium-sized applications.

See all articles