<div dir="ltr">Hi John,<div><br></div><div>Thanks for the very prompt feedback. I don't have a line in <a href="https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmysql.pm&data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7C06d391cd309c4b45364208d6929273dc%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&sdata=P36b3ErBNYtOOIkUd1vCik0uCZQZ7qHdKRaeojNQm%2B0%3D&reserved=0" originalSrc="http://mysql.pm" shash="LXpYFkaSXlvt8MV7exm5ElphXXydXaw2QauW5aGTdssWbPFLMtK2InkA+Cq2OJp0V4J4/tfeYCmyh+3MsEu3GQ5JAhl0vhje3tQpuB4Imz9JCelt8ftievbIVn9VF7jedqj74dopnBf+3vz+OVB+vJbP6SPU45KkGkidAaUvu04=">mysql.pm</a> so I'll try setting that (to 3 or 4 as suggested). Interestingly the ideal solution is to "produce better SQL" but isn'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's using MyISAM?</div><div><br></div><div>Thanks again,</div><div>Fran<br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_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 <<a href="mailto:J.Salter@leeds.ac.uk">J.Salter@leeds.ac.uk</a>> 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&data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7C06d391cd309c4b45364208d6929273dc%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&sdata=P36b3ErBNYtOOIkUd1vCik0uCZQZ7qHdKRaeojNQm%2B0%3D&reserved=0" originalSrc="http://mysql.pm" shash="LXpYFkaSXlvt8MV7exm5ElphXXydXaw2QauW5aGTdssWbPFLMtK2InkA+Cq2OJp0V4J4/tfeYCmyh+3MsEu3GQ5JAhl0vhje3tQpuB4Imz9JCelt8ftievbIVn9VF7jedqj74dopnBf+3vz+OVB+vJbP6SPU45KkGkidAaUvu04=" target="_blank">mysql.pm</a>, do you have a line that references 'optimizer_search_depth'?<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&data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7C06d391cd309c4b45364208d6929273dc%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&sdata=hfSVWQXycG0wCsOiUPTGA26VwtAiUbvxGMpv39%2F88ME%3D&reserved=0" originalSrc="https://github.com/eprints/eprints/issues/120" shash="rxFzFyP3f2lCLdcbBbAG0eK2If7h1mqX0+2RDNWxK8+61e453a/oQR0CNWatLl6b4FMiB/0guC1ol7j1ZZzbxTD6CmbY571fbLPQubslCF3d6UO7uKyItMx2LR70mlhWb7r7zGSPih7qaJoDTsU4zyboWWvPWdsuJ6nkZ0Jo2NE=" 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>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><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 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't lock a table were doing so for some
reason (I cannot recall the exact details - but I don't think it's an 'eprints' thing - I could recreate the scenario in the DB directly).<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>
<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>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<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 'top' 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`='1037', `edit_lock_since`='1550139932', `edit_lock_until`='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'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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