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B.5.6.2 TEMPORARY Table Problems

Temporary tables created with CREATE TEMPORARY TABLE have the following limitations:

  • TEMPORARY tables are supported only by the InnoDB, MEMORY, MyISAM, and MERGE storage engines.

  • Temporary tables are not supported for NDB Cluster.

  • The SHOW TABLES statement does not list TEMPORARY tables.

  • You cannot use RENAME TABLE to rename a TEMPORARY table. However, you can use ALTER TABLE instead:

    ALTER TABLE old_name RENAME new_name;
    
  • You cannot refer to a TEMPORARY table more than once in the same query. For example, the following does not work:

    SELECT * FROM temp_table JOIN temp_table AS t2;
    

    The statement produces this error:

    ERROR 1137: Can't reopen table: 'temp_table'
    
  • The Can't reopen table error also occurs if you refer to a temporary table multiple times in a stored function under different aliases, even if the references occur in different statements within the function. It may occur for temporary tables created outside stored functions and referred to across multiple calling and callee functions.

  • There are known issues in using temporary tables with replication. See Section 17.4.1.24, “Replication and Temporary Tables”, for more information.


User Comments
  Posted by Devang Modi on August 30, 2011
Combine queries for Insert and Select always obeys Innodb locking rules
if one of the source table is based on Innodb engine.
It is also possible that the INSERT activity applicable to TEMPORARY
table which is not InnoDB engine. It is also possible that in SELECT
section with INNODB, some other TEMPORARY Tables are used.
Devang Modi
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