WL#2814: Query timeouts (SQL_TIMEOUT option)
Affects: Server-7.0 — Status: Un-Assigned — Priority: Low
Using SQL_TIMEOUT option user will be able to specify maximum execution time for query (by inserting proper option specification into the text of the query). For example "SELECT SQL_TIMEOUT=30 * FROM foo.bar" will mean that query execution should be aborted with proper error-message if it takes more than 30 seconds. Since this option could not be used in safe way with DML statements on non-transactional tables (at least until support for statement rollbacks will be implemented for them) it is intended only for SELECT statements. We will also have "sql_select_timeout" session variable which will allow user to specify default SQL_TIMEOUT value for all (SELECT) queries in this connection. (Dmitri already has almost finished patch for this.) Note added by Trudy Pelzer on 2005-10-05: This task suggests SQL_TIMEOUT to implement the feature. WL#1242 "Kill connections with disconnected clients" also suggests the use of SQL_TIMEOUT. So we need to be aware of a possible conflict if both tasks are implemented. See also thread "Re: Newly Added (by DmitriLenev): Query timeouts (SQL_TIMEOUT option) (2814)" https://intranet.mysql.com/secure/mailarchive/mail.php?folder=5&mail=42031 See also WL#1272 User timeouts on queries
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