April 2008
Intermediate to advanced
566 pages
21h 55m
English
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Name
UNLOCK TABLES
Synopsis
UNLOCK TABLES
Use this statement to unlock tables that were locked by the
current connection thread with the LOCK TABLES
statement or by FLUSH TABLES WITH READ LOCK.
UNLOCK TABLES implicitly commits any active
transactions if any tables were locked with LOCK
TABLES. When performing a large amount of changes to data in
MyISAM tables, it can be useful and faster to lock the tables first.
This way the key cache isn’t flushed after each SQL statement.
Instead, the server flushes the key cache when executing
UNLOCK TABLES. Here is an example:
UNLOCK TABLES;
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I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.