Comments on: Stored Function to generate Sequences http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/ Everything about MySQL Performance Wed, 10 Mar 2010 01:20:14 +0000 hourly 1 By: Bruno Braga http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/comment-page-1/#comment-668321 Bruno Braga Sat, 24 Oct 2009 00:15:13 +0000 http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/#comment-668321 Yeah, I did a stress testing on this, and worked fine (on InnoDB as well). Yeah, I did a stress testing on this, and worked fine (on InnoDB as well).

]]> By: Baron Schwartz http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/comment-page-1/#comment-668117 Baron Schwartz Fri, 23 Oct 2009 12:23:59 +0000 http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/#comment-668117 MyISAM has table-level locking. It works. MyISAM has table-level locking. It works.

]]> By: Bruno Braga http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/comment-page-1/#comment-667566 Bruno Braga Thu, 22 Oct 2009 07:06:04 +0000 http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/#comment-667566 This code does not handle concurrency/locking. Has anyone tested this against overloaded systems? I have the feeling it will not work properly. This code does not handle concurrency/locking. Has anyone tested this against overloaded systems? I have the feeling it will not work properly.

]]> By: saroj http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/comment-page-1/#comment-572044 saroj Tue, 02 Jun 2009 05:15:38 +0000 http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/#comment-572044 thanks peter code worked thanks peter code worked

]]> By: Using Multiple Sequences in a Table « Everything MySQL http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/comment-page-1/#comment-355572 Using Multiple Sequences in a Table « Everything MySQL Tue, 16 Sep 2008 18:32:21 +0000 http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/#comment-355572 [...] issues.  After lot of trials, debates and finally referring Planet MySQL, I went ahead with this suggestion by Peter from MySQL Performance Blog and some help from here. CREATE TABLE sequences ( event_id [...] [...] issues.  After lot of trials, debates and finally referring Planet MySQL, I went ahead with this suggestion by Peter from MySQL Performance Blog and some help from here. CREATE TABLE sequences ( event_id [...]

]]> By: Justin Huff http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/comment-page-1/#comment-337671 Justin Huff Thu, 31 Jul 2008 01:22:16 +0000 http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/#comment-337671 I typically see the update step written like: UPDATE sequence SET nValue=last_insert_id(nValue+1) WHERE strName=? I'd like to allow servers the option of asking for more than one id per call by moving the increment step outside the last_insert_id: UPDATE sequence SET nValue=last_insert_id(nValue)+? WHERE strName=? The value in the table shifts from being the 'last id handed out' to 'the next id to hand out'. That way requesters don't need to know how big the last block was. Am I missing something here? Thanks! I typically see the update step written like:
UPDATE sequence SET nValue=last_insert_id(nValue+1) WHERE strName=?

I’d like to allow servers the option of asking for more than one id per call by moving the increment step outside the last_insert_id:
UPDATE sequence SET nValue=last_insert_id(nValue)+? WHERE strName=?

The value in the table shifts from being the ‘last id handed out’ to ‘the next id to hand out’. That way requesters don’t need to know how big the last block was.

Am I missing something here?
Thanks!

]]> By: Links for Wed 7 May 2008 - Joseph Scott’s Blog http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/comment-page-1/#comment-296732 Links for Wed 7 May 2008 - Joseph Scott’s Blog Thu, 08 May 2008 16:52:56 +0000 http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/#comment-296732 [...] Stored Function to generate Sequences | MySQL Performance Blog - You could combine this with an INSERT trigger and get even more auto_increment like functionality. Tags: database mysql sequence [...] [...] Stored Function to generate Sequences | MySQL Performance Blog – You could combine this with an INSERT trigger and get even more auto_increment like functionality. Tags: database mysql sequence [...]

]]> By: peter http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/comment-page-1/#comment-265378 peter Fri, 04 Apr 2008 01:41:33 +0000 http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/#comment-265378 Arjen, Indeed insert on dup key updates saves you from initialization though I'm wondering what way would be the faster. Though I guess there would not be any significant difference here. Arjen,

Indeed insert on dup key updates saves you from initialization though I’m wondering what way would be the faster.
Though I guess there would not be any significant difference here.

]]> By: Arjen Lentz http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/comment-page-1/#comment-265373 Arjen Lentz Fri, 04 Apr 2008 01:36:52 +0000 http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/#comment-265373 kL, even with a sequence generator stored in MyISAM you would not see the same number in different threads. kL, even with a sequence generator stored in MyISAM you would not see the same number in different threads.

]]> By: Arjen Lentz http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/comment-page-1/#comment-265372 Arjen Lentz Fri, 04 Apr 2008 01:34:58 +0000 http://www.mysqlperformanceblog.com/2008/04/02/stored-function-to-generate-sequences/#comment-265372 Here was mine http://arjen-lentz.livejournal.com/34627.html (been there for a few years ;-) Also incorporates a trigger so the app can be oblivious it's not an AUTO_INCREMENT column. Here was mine http://arjen-lentz.livejournal.com/34627.html (been there for a few years ;-)
Also incorporates a trigger so the app can be oblivious it’s not an AUTO_INCREMENT column.

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