<div dir="ltr">Hi John/All,<div><br></div><div>One more question. If I find MyISAM tables in my DB is it a simple matter of ALTER TABLE isam_table_name ENGINE = innodb ?</div><div><br></div><div>Fran Callaghan<br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div><br></div></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 14 Feb 2019 at 15:47, Fran Callaghan via Eprints-tech &lt;<a href="mailto:eprints-tech@ecs.soton.ac.uk">eprints-tech@ecs.soton.ac.uk</a>&gt; wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi John,<div><br></div><div>Thanks for the very prompt feedback. I don&#39;t have a line in <a href="https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmysql.pm&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7C6b20b54b4e694f2437f408d693458c22%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&amp;sdata=20OFdG%2B34QxYZHG8cc8SgtL8YgJswSZMGiQGxZDJ6CU%3D&amp;reserved=0" originalSrc="http://mysql.pm" shash="LNu2Qr0K8bqdXbHTNeUxmBQcYCMrjDl0f/ya7dREkY4cnacw2vC32Exx83kgBzqzmvegEV4tNbRbZVCrs6XBodKnHtZwprK2kW4xP4QHqhOdt/jpWGD3VpupxAKUJkrQrdyMz4Wa0XlZRfrz2556WiqjxoDafUxZbHr3OvOGrP0=" target="_blank">mysql.pm</a> so I&#39;ll try setting that (to 3 or 4 as suggested). Interestingly the ideal solution is to &quot;produce better SQL&quot; but isn&#39;t it only eprints producing the SQL?</div><div><br></div><div>As for MyISAM I thought it was deprecated (or at least supplanted by InnoDB) the system was only built 6 months ago. Can anybody tell me how I can determine if it&#39;s using MyISAM?</div><div><br></div><div>Thanks again,</div><div>Fran<br clear="all"><div><div dir="ltr" class="gmail-m_2956997050270959076gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><br></div></div></div></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 14 Feb 2019 at 15:28, John Salter &lt;<a href="mailto:J.Salter@leeds.ac.uk" target="_blank">J.Salter@leeds.ac.uk</a>&gt; wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Hi Fran,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">A couple of things to look at:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">In ~/perl_lib/EPrints/Database/<a href="https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmysql.pm&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7C6b20b54b4e694f2437f408d693458c22%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&amp;sdata=20OFdG%2B34QxYZHG8cc8SgtL8YgJswSZMGiQGxZDJ6CU%3D&amp;reserved=0" originalSrc="http://mysql.pm" shash="LNu2Qr0K8bqdXbHTNeUxmBQcYCMrjDl0f/ya7dREkY4cnacw2vC32Exx83kgBzqzmvegEV4tNbRbZVCrs6XBodKnHtZwprK2kW4xP4QHqhOdt/jpWGD3VpupxAKUJkrQrdyMz4Wa0XlZRfrz2556WiqjxoDafUxZbHr3OvOGrP0=" target="_blank">mysql.pm</a>, do you have a line that references &#39;optimizer_search_depth&#39;?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">If not, this might be useful: <a href="https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Feprints%2Feprints%2Fissues%2F120&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7C6b20b54b4e694f2437f408d693458c22%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&amp;sdata=W5KhCao2ccVyEFYhLC3CPgxnrj0RM0Pg6W%2B4veuOv28%3D&amp;reserved=0" originalSrc="https://github.com/eprints/eprints/issues/120" shash="hFl94VP6hvIbcGJggIIah4Vg1H+0ltWI+qsr/HhgGZmrqtiqS/o/FZKDDcVYKF7JmU+tx/J2jCDd5gxuA3C/MIimD4yERLdHWVTbbyTvgmU/mCJnbXjXQ+nci7n/bkeaxH4h3337lUk+UT1G+pU08+dIFlS8gqJPDmbJrRebvjU=" target="_blank">https://github.com/eprints/eprints/issues/120</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">If you already have that, what about the storage engines the tables are using?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">MyISAM uses table-level locking, but InnoDB use row-level locking.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">I did some investigations a while ago, and found that some queries that looked like they shouldn&#39;t lock a table were doing so for some
 reason (I cannot recall the exact details - but I don&#39;t think it&#39;s an &#39;eprints&#39; thing - I could recreate the scenario in the DB directly).<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Any of that help?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Cheers,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">John<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11pt;font-family:Calibri,sans-serif">From:</span></b><span lang="EN-US" style="font-size:11pt;font-family:Calibri,sans-serif"> <a href="mailto:eprints-tech-bounces@ecs.soton.ac.uk" target="_blank">eprints-tech-bounces@ecs.soton.ac.uk</a> [mailto:<a href="mailto:eprints-tech-bounces@ecs.soton.ac.uk" target="_blank">eprints-tech-bounces@ecs.soton.ac.uk</a>]
<b>On Behalf Of </b>Fran Callaghan via Eprints-tech<br>
<b>Sent:</b> 14 February 2019 14:50<br>
<b>To:</b> <a href="mailto:eprints-tech@ecs.soton.ac.uk" target="_blank">eprints-tech@ecs.soton.ac.uk</a><br>
<b>Subject:</b> [EP-tech] New system, crashing periodically b/c MySQL Locking<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Hi Everybody,<u></u><u></u></p>
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<p class="MsoNormal">We have a (reasonably) new install that has been grinding to a halt every week or two. When I look at &#39;top&#39; on the command line (Red Hat) mysqld is hogging 100% CPU. When I use mysqladmin processlist I can see a number of sessions queuing
 behind this...<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal" style="margin-bottom:10pt;line-height:115%"><span lang="EN" style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif">| 104558 | doras | localhost | doras | Query   | 1587 | statistics                   | INSERT INTO
 `cache17312`(`pos`, `eprintid`) SELECT @i:=@i+1, `eprintid` FROM (SELECT `eprint`.`eprin | 0.000    |</span><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:10pt;line-height:115%"><span lang="EN" style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif">The other processes (queued) are all waiting for table level lock and look like this...</span><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:10pt;line-height:115%"><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-bottom:10pt;line-height:115%"><span lang="EN" style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif">| 105134 | doras | localhost | doras | Query   | 487  | Waiting for table level lock | UPDATE `eprint`
 SET `edit_lock_user`=&#39;1037&#39;, `edit_lock_since`=&#39;1550139932&#39;, `edit_lock_until`=&#39;1550 | 0.000    |</span><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:10pt;line-height:115%"><span lang="EN" style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif">| 105135 | doras | localhost | doras | Query   | 486  | Waiting for table level lock | SELECT `eprintid`,`rev_number`,`eprint_status`,`userid`,`importid`,`source`,`dir`,`datestamp_year`,`
 | 0.000  </span><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:10pt;line-height:115%"><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-bottom:10pt;line-height:115%"><span lang="EN" style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif">Eventually the max http processes is reached and the system crashes. The only remedy is to restart
 httpd and mariadb.</span><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:10pt;line-height:115%"><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-bottom:10pt;line-height:115%"><span lang="EN" style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif">Any ideas what this insert into cache is and why it&#39;s locking the the system?</span><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif"><u></u><u></u></span></p>
<p class="MsoNormal" style="margin-bottom:10pt;line-height:115%"><span lang="EN" style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif">Thanks for any guidance</span><span style="font-size:11pt;line-height:115%;font-family:Calibri,sans-serif"><u></u><u></u></span></p>
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<p class="MsoNormal">Fran Callaghan<u></u><u></u></p>
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<p class="MsoNormal">Dublin City University<u></u><u></u></p>
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<pre style="background-color:rgb(255,255,255)"><i><p><font color="#929292" face="Verdana, sans-serif"><span style="font-size:10px;white-space:normal"><b>Séanadh Ríomhphoist/Email Disclaimer</b></span></font></p><p><font color="#929292" face="Verdana, sans-serif"><span style="font-size:10px;white-space:normal"><b>Tá an ríomhphost seo agus aon chomhad a sheoltar leis faoi rún agus is lena úsáid ag an seolaí agus sin amháin é. <a href="https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww4.dcu.ie%2Fiss%2Fseanadh-riomhphoist.shtml&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7C6b20b54b4e694f2437f408d693458c22%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&amp;sdata=Q%2F%2BlQR6Pb9NX7vuNJ%2FIfHUOaIwlVcKqyUvNU%2F%2B6qPOA%3D&amp;reserved=0" originalSrc="https://www4.dcu.ie/iss/seanadh-riomhphoist.shtml" shash="LXRE7deOJYicMtded2ajs6ACaR/av8FLOajnr/EejrpzrdrHyMJkbtDnAotGHWFsQ16FTKQ9Qe3VGX2SDqxubXMhrRuJ0+yQH13yn64br9VsMwoZRJygGjSrbSnpZ6c+PNrEV+2DbLeMDsGDbyT814upzjdtuGjZ7BQKZXCeFOU=" target="_blank">Is féidir tuilleadh a léamh anseo. </a></b></span></font></p><p><font color="#929292" face="Verdana, sans-serif"><span style="font-size:10px;white-space:normal"><b>This e-mail and any files transmitted with it are confidential and are intended solely for use by the addressee. <a href="https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww4.dcu.ie%2Fiss%2Femail-disclaimer.shtml&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7C6b20b54b4e694f2437f408d693458c22%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&amp;sdata=Wy%2Bc8biERk8OYXcF0z8odm5lZpny5E2BbtMkkNLdl%2B8%3D&amp;reserved=0" originalSrc="https://www4.dcu.ie/iss/email-disclaimer.shtml" shash="zojHylxwiwaW/oCD3IGmrCfoS+dxET26zQcg0Kbh1D9qNfK/K5k0+F4aYPTo7H1ZNrQPLsH4fjCWQdCJmlDUOFoxh0gKCCdC5+OOJPMr8z058JZs9wHbwfQJnGDS/fQ0tDWG8zDfgh/+drDfWaFEjAM/0IB1pdah0FjC3YWo/r4=" target="_blank">Read more here.</a></b></span></font></p><div style="color:rgb(146,146,146);font-family:Verdana;font-size:10px;white-space:normal"><br></div><div style="color:rgb(146,146,146);font-family:Verdana;font-size:10px;white-space:normal"><br></div></i></pre>
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