On Sun, Mar 03, 2002 at 07:51:36PM -0800, Son Nguyen wrote: > Dear all, > If my site has two users try to update the same piece of data in > mySQL at the same time. > > * I wonder if I have to create a lock to handle the race condition in > my script or not? > > * Or mySQL already provided a method, which is when the first user > update the data in mySQL, mySQL is locked until the update query to be > finished. Then mySQL take the second user's request?
MyISAM tables perform implicit table locking for all queries. Write queries use an exlusive write lock, while read queries use a shared read lock. Does that help? Jeremy -- Jeremy D. Zawodny, <[EMAIL PROTECTED]> Technical Yahoo - Yahoo Finance Desk: (408) 349-7878 Fax: (408) 349-5454 Cell: (408) 685-5936 MySQL 3.23.47-max: up 24 days, processed 812,006,625 queries (382/sec. avg) --------------------------------------------------------------------- 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
