Comments on: MyISAM concurrent insert http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/ Percona's MySQL & InnoDB performance and scalability blog Sat, 11 Feb 2012 16:45:54 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Richard http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/comment-page-1/#comment-815378 Richard Tue, 23 Aug 2011 13:44:03 +0000 http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/#comment-815378 OK, I've never mucked much with this setting, or ever actually, but the stock site I manage is about 170 gig on drive, daily does millions of inserts, updates, selects, and a few 1000 deletes. Some of the larger tables are well over 100,000,000 rows of data, that are part of the daily changes. I have noticed since more and more data is being written, changed, I'm getting slow query issues reading and writing. Do you think if I were to disabled concurrent insert this would help or worsen the select from time issues (the tables are Primary Key index ID,Date, and indexed Date, with the Select statements always: Select from table where ID = ###### Order by Date with sometimes AND Date >= 20100101 and Date <= 20110101 (for ranges of between specific dates) OK, I’ve never mucked much with this setting, or ever actually, but the stock site I manage is about 170 gig on drive, daily does millions of inserts, updates, selects, and a few 1000 deletes. Some of the larger tables are well over 100,000,000 rows of data, that are part of the daily changes. I have noticed since more and more data is being written, changed, I’m getting slow query issues reading and writing. Do you think if I were to disabled concurrent insert this would help or worsen the select from time issues (the tables are Primary Key index ID,Date, and indexed Date, with the Select statements always:

Select from table where ID = ###### Order by Date

with sometimes

AND Date >= 20100101 and Date <= 20110101 (for ranges of between specific dates)

]]> By: Bandara http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/comment-page-1/#comment-699413 Bandara Mon, 21 Dec 2009 18:06:04 +0000 http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/#comment-699413 Hi, Any one know how to run mySQL from the visual studio 2008. I tried by building the mySQL source code and it worked fine. But problem is how to run it. So if any one can provide step by step procedure its great. Hi,

Any one know how to run mySQL from the visual studio 2008. I tried by building the mySQL source code and it worked fine. But problem is how to run it. So if any one can provide step by step procedure its great.

]]> By: Marc Pinel http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/comment-page-1/#comment-337964 Marc Pinel Thu, 31 Jul 2008 15:01:45 +0000 http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/#comment-337964 Hi man, i have concurrent-insert=2 set....how would the positively impact the performance? i have a torrent tracker (legal content ofcourse) with heavy php and mysql visits daily...and some spikes. Hi man,

i have concurrent-insert=2 set….how would the positively impact the performance? i have a torrent tracker (legal content ofcourse) with heavy php and mysql visits daily…and some spikes.

]]> By: Online Car Insurance Rate Quotes http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/comment-page-1/#comment-2865 Online Car Insurance Rate Quotes Thu, 28 Sep 2006 07:36:21 +0000 http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/#comment-2865 <strong>Online Car Insurance Rate Quotes...</strong> Online Car Insurance Rate Quotes... Online Car Insurance Rate Quotes…

Online Car Insurance Rate Quotes…

]]> By: Vadim http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/comment-page-1/#comment-2766 Vadim Mon, 25 Sep 2006 06:16:20 +0000 http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/#comment-2766 Jerry, Well... There are several points: 1. Possible negative effect - your INSERTS will be a bit longer. I don't know any bugs with disabled concurrent insert. 2. If you use only point selects, or selects that retieve only several rows - I don't think concurrent=off will help you much - perhaps otherwise. 3. if you use select retrieves many rows - you definitely should use concurrent=off 4. if your database is more write that read - then I again don't think concurrent is important for you - most time tables are in WRITE lock. 5. But better way - test it - for example you can take mysql with patched query log and analyze execution time of queries with concurrent insert = off and on. Jerry,

Well…
There are several points:
1. Possible negative effect – your INSERTS will be a bit longer. I don’t know any bugs with disabled concurrent insert.
2. If you use only point selects, or selects that retieve only several rows – I don’t think concurrent=off will help you much – perhaps otherwise.
3. if you use select retrieves many rows – you definitely should use concurrent=off
4. if your database is more write that read – then I again don’t think concurrent is important for you – most time
tables are in WRITE lock.
5. But better way – test it – for example you can take mysql with patched query log and analyze execution time of queries with concurrent insert = off and on.

]]> By: Jerry http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/comment-page-1/#comment-2756 Jerry Sun, 24 Sep 2006 16:41:17 +0000 http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/#comment-2756 What is the negative impact to turn the concurrent_insert off? Will it make insert waits much longer? Is there any bug or issue related to turn off this default feature? Will turning off the feature help queries which have no insert on the same table at the same time? My system has update:Insert:Select ratio is 3:1.5:1 so the db is write more than read. Thanks. What is the negative impact to turn the concurrent_insert off? Will it make insert waits much longer? Is there any bug or issue related to turn off this default feature?
Will turning off the feature help queries which have no insert on the same table at the same time?

My system has update:Insert:Select ratio is 3:1.5:1 so the db is write more than read.

Thanks.

]]> By: Vadim http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/comment-page-1/#comment-260 Vadim Fri, 23 Jun 2006 13:31:39 +0000 http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/#comment-260 Citrin, I usually use sysbench (http://sysbench.sf.net). Citrin,

I usually use sysbench (http://sysbench.sf.net).

]]> By: citrin http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/comment-page-1/#comment-259 citrin Fri, 23 Jun 2006 13:22:58 +0000 http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/#comment-259 Which soft was used in this benchmark? Which soft was used in this benchmark?

]]> By: Vadim http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/comment-page-1/#comment-194 Vadim Sat, 17 Jun 2006 05:15:39 +0000 http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/#comment-194 I did not test concurrent-insert = 2, but looking at source code - it changes SELECTs code in no way. So the results will be the same. I did not test concurrent-insert = 2, but looking at source code – it changes SELECTs code in no way. So the results will be the same.

]]> By: Apachez http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/comment-page-1/#comment-187 Apachez Fri, 16 Jun 2006 21:26:24 +0000 http://www.mysqlperformanceblog.com/2006/06/13/myisam-concurrent-insert/#comment-187 How does the "concurrent-insert = 2" feature described by Arjen affect the outcome of the above benchmark ? How does the “concurrent-insert = 2″ feature described by Arjen affect the outcome of the above benchmark ?

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