Hi! On Nov 19, Ian Collins wrote: > If you open a table using HANDLER, > > e.g, HANDLER MYTABLE OPEN; > > then during the course of your application truncate that table, > > e.g, TRUNCATE TABLE MYTABLE; > > then you get some really wierd behaviour (my wierd behaviour was the > application rolling on a free in a completely different part of the > program). > > I hadn't even used a HANDLER READ when it had crashed - just the OPEN. > > I guess it's kind of understandable, and not something that happens a lot, > but it may be worth adding this caveat to the documentation (to save some > other lost soul hours of screen kicking). > > Regards, > Ian Collins.
Actually, it is documented: `HANDLER' is somewhat low-level statement, for example it does not provide consistency. That is `HANDLER ... OPEN' does *NOT* takes a snapshot of the table, and does *NOT* locks the table. The above means, that after `HANDLER ... OPEN' table data can be modified (by this or other thread) and these modifications may appear only partially in `HANDLER ... NEXT' or `HANDLER ... PREV' scans. That is, the only thing that is guaranteed that it won't crush mysqld :-) Low-level commands should be used with caution - as usual. Still, we could, probably, make it clearer it the manual. Thanks for the note. Regards, Sergei -- MySQL Development Team __ ___ ___ ____ __ / |/ /_ __/ __/ __ \/ / Sergei Golubchik <[EMAIL PROTECTED]> / /|_/ / // /\ \/ /_/ / /__ MySQL AB, http://www.mysql.com/ /_/ /_/\_, /___/\___\_\___/ Osnabrueck, Germany <___/ --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
