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Bug#49501 Inefficient information_schema check (system collation)

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added check_length optimization for I_S_NAME comparison
This commit is contained in:
Sergey Glukhov
2010-01-19 13:03:40 +04:00
parent 22cff39274
commit baacdf1dae
9 changed files with 49 additions and 41 deletions
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5
sql/sql_db.cc
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@ -618,7 +618,7 @@ int mysql_create_db(THD *thd, char *db, HA_CREATE_INFO *create_info,
DBUG_ENTER("mysql_create_db");
/* do not create 'information_schema' db */
if (!my_strcasecmp(system_charset_info, db, INFORMATION_SCHEMA_NAME.str))
if (is_schema_db(db, strlen(db)))
{
my_error(ER_DB_CREATE_EXISTS, MYF(0), db);
DBUG_RETURN(-1);
@ -1557,8 +1557,7 @@ bool mysql_change_db(THD *thd, const LEX_STRING *new_db_name, bool force_switch)
}
}
if (my_strcasecmp(system_charset_info, new_db_name->str,
INFORMATION_SCHEMA_NAME.str) == 0)
if (is_schema_db(new_db_name->str, new_db_name->length))
{
/* Switch the current database to INFORMATION_SCHEMA. */