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

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