On Sun, 9 Aug 2009 20:17:15 +0200, "Ralph Deffke" wrote: > I'm facing the fact that it seems that auto_increment fields in a table not > start at 1 like it was in earlier versions even if I install mySQL brand new > creating all tables new. it seems to me that auto_increments handling has > changed to older version. is somebody out there who can give me a quick > background about auto_increment and how and if I can control the behavior of > mySQL about them.
Did you Google for it? I found the following page that might be relevant: <http://dev.mysql.com/doc/refman/5.1/en/innodb-auto-increment-handling.html> "Beginning with MySQL 5.1.22, InnoDB provides a locking strategy that significantly improves scalability and performance of SQL statements that add rows to tables with AUTO_INCREMENT columns. ... InnoDB uses the following algorithm to initialize the auto-increment counter for a table t that contains an AUTO_INCREMENT column named ai_col: After a server startup, for the first insert into a table t, InnoDB executes the equivalent of this statement: SELECT MAX(ai_col) FROM t FOR UPDATE; InnoDB increments by one the value retrieved by the statement and assigns it to the column and to the auto-increment counter for the table." /Nisse -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
