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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">This should do it:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">SELECT<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">&nbsp; TABLE_NAME,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">&nbsp;&nbsp;ENGINE<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">FROM<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">&nbsp; information_schema.TABLES<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">WHERE<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">&nbsp; TABLE_SCHEMA = 'doras';<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">If you've migrated EPrints config, or migrated databases, there might be some old-format tables hanging around.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">John<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> eprints-tech-bounces@ecs.soton.ac.uk [mailto:eprints-tech-bounces@ecs.soton.ac.uk]
<b>On Behalf Of </b>Fran Callaghan via Eprints-tech<br>
<b>Sent:</b> 14 February 2019 15:38<br>
<b>To:</b> eprints-tech@ecs.soton.ac.uk<br>
<b>Subject:</b> Re: [EP-tech] New system, crashing periodically b/c MySQL Locking<o:p></o:p></span></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">Hi John,<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">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&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7Cc399a01927574c230f3d08d692945459%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&amp;sdata=nv0oW7a9m%2Fj9My4gmIRHiqn8ashklcNfWdbUSUvBn9U%3D&amp;reserved=0" originalSrc="http://mysql.pm" shash="IgEcrw46K2jtdH398dWc+fixAqd7DF5O9XcMzyaSHoUVtf30iOKUMd28VhsRSxOv2KwxWggS9xncEEe9ArmYi26MI3oN4O+1phW4LfnsnM5bAlboyXk2eJJBCGCka0PNmuc0x9RqXewUm804oKW9WrHXQ3DsL1DwTpITSTsPAl0=">
mysql.pm</a> so I'll try setting that (to 3 or 4 as suggested). Interestingly the ideal solution is to &quot;produce better SQL&quot; but isn't it only eprints producing the SQL?<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">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?<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">Thanks again,<o:p></o:p></p>
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<p class="MsoNormal">Fran<br clear="all">
<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">On Thu, 14 Feb 2019 at 15:28, John Salter &lt;<a href="mailto:J.Salter@leeds.ac.uk">J.Salter@leeds.ac.uk</a>&gt; wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Hi Fran,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">A couple of things to look at:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">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%7Cc399a01927574c230f3d08d692945459%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&amp;sdata=nv0oW7a9m%2Fj9My4gmIRHiqn8ashklcNfWdbUSUvBn9U%3D&amp;reserved=0" originalSrc="http://mysql.pm" shash="IgEcrw46K2jtdH398dWc+fixAqd7DF5O9XcMzyaSHoUVtf30iOKUMd28VhsRSxOv2KwxWggS9xncEEe9ArmYi26MI3oN4O+1phW4LfnsnM5bAlboyXk2eJJBCGCka0PNmuc0x9RqXewUm804oKW9WrHXQ3DsL1DwTpITSTsPAl0=" target="_blank">mysql.pm</a>,
 do you have a line that references 'optimizer_search_depth'?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">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%7Cc399a01927574c230f3d08d692945459%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&amp;sdata=CkkyQTHyZjaNUrY%2FUJHWWuxLZMX88Gueoh6QH%2BnIBhg%3D&amp;reserved=0" originalSrc="https://github.com/eprints/eprints/issues/120" shash="voiksXJ/QuJ8U418UMC46g0qfcpLblhVkzn3NRvvHCBVJTtsGTigZqke3GlP1fSmKl37hMUirw/s3BnPokCPrRH8qZJnd0d3J+dYfFDUuij3Ymi+27Fsds5mfnQc/yls2DOtfsyG/M7NDHVM6gb2EpU1/1J6R2n6HOQQXxzeVRk=" target="_blank">
https://github.com/eprints/eprints/issues/120</a></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">&nbsp;</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">&nbsp;</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">If you already have that, what about the storage engines the tables are using?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">MyISAM uses table-level locking, but InnoDB use row-level locking.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">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).</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">&nbsp;</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Any of that help?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Cheers,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">John</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">&nbsp;</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">&nbsp;</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US" style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:&quot;Calibri&quot;,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</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">&nbsp;<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi Everybody,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">&nbsp;<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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...<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">&nbsp;<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:10.0pt;line-height:115%">
<span lang="EN" style="font-size:11.0pt;line-height:115%;font-family:&quot;Calibri&quot;,sans-serif">| 104558 | doras | localhost | doras | Query&nbsp;&nbsp; | 1587 | statistics&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | INSERT INTO `cache17312`(`pos`, `eprintid`) SELECT @i:=@i&#43;1, `eprintid` FROM (SELECT
 `eprint`.`eprin | 0.000&nbsp;&nbsp;&nbsp; |</span><o:p></o:p></p>
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<span lang="EN" style="font-size:11.0pt;line-height:115%;font-family:&quot;Calibri&quot;,sans-serif">The other processes (queued) are all waiting for table level lock and look like this...</span><o:p></o:p></p>
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<span style="font-size:11.0pt;line-height:115%;font-family:&quot;Calibri&quot;,sans-serif">&nbsp;</span><o:p></o:p></p>
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<span lang="EN" style="font-size:11.0pt;line-height:115%;font-family:&quot;Calibri&quot;,sans-serif">| 105134 | doras | localhost | doras | Query&nbsp;&nbsp; | 487&nbsp; | Waiting for table level lock | UPDATE `eprint` SET `edit_lock_user`='1037', `edit_lock_since`='1550139932', `edit_lock_until`='1550
 | 0.000&nbsp;&nbsp;&nbsp; |</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:10.0pt;line-height:115%">
<span lang="EN" style="font-size:11.0pt;line-height:115%;font-family:&quot;Calibri&quot;,sans-serif">| 105135 | doras | localhost | doras | Query&nbsp;&nbsp; | 486&nbsp; | Waiting for table level lock | SELECT `eprintid`,`rev_number`,`eprint_status`,`userid`,`importid`,`source`,`dir`,`datestamp_year`,`
 | 0.000&nbsp;&nbsp;</span><o:p></o:p></p>
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<span style="font-size:11.0pt;line-height:115%;font-family:&quot;Calibri&quot;,sans-serif">&nbsp;</span><o:p></o:p></p>
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<span lang="EN" style="font-size:11.0pt;line-height:115%;font-family:&quot;Calibri&quot;,sans-serif">Eventually the max http processes is reached and the system crashes. The only remedy is to restart httpd and mariadb.</span><o:p></o:p></p>
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<span style="font-size:11.0pt;line-height:115%;font-family:&quot;Calibri&quot;,sans-serif">&nbsp;</span><o:p></o:p></p>
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<span lang="EN" style="font-size:11.0pt;line-height:115%;font-family:&quot;Calibri&quot;,sans-serif">Any ideas what this insert into cache is and why it's locking the the system?</span><o:p></o:p></p>
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<span lang="EN" style="font-size:11.0pt;line-height:115%;font-family:&quot;Calibri&quot;,sans-serif">Thanks for any guidance</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Fran Callaghan<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Dublin City University<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">&nbsp;<o:p></o:p></p>
<p style="background:white"><b><i><span style="font-size:7.5pt;font-family:&quot;Verdana&quot;,sans-serif;color:#929292">Séanadh Ríomhphoist/Email Disclaimer</span></i></b><o:p></o:p></p>
<p style="background:white"><b><i><span style="font-size:7.5pt;font-family:&quot;Verdana&quot;,sans-serif;color:#929292">Tá an ríomhphost seo agus aon chomhad a sheoltar leis faoi rún agus is lena úsáid ag an seolaí agus sin amháin é.
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Is féidir tuilleadh a léamh anseo.&nbsp;</a></span></i></b><o:p></o:p></p>
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Read more here.</a></span></i></b><o:p></o:p></p>
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<pre style="background:white"><i><span style="font-size:7.5pt;font-family:&quot;Verdana&quot;,sans-serif;color:#929292">&nbsp;</span></i><o:p></o:p></pre>
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<pre style="background:white"><i><span style="font-size:7.5pt;font-family:&quot;Verdana&quot;,sans-serif;color:#929292">&nbsp;</span></i><o:p></o:p></pre>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p style="background:white"><b><i><span style="font-size:7.5pt;font-family:&quot;Verdana&quot;,sans-serif;color:#929292">Séanadh Ríomhphoist/Email Disclaimer</span></i></b><i><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;"><o:p></o:p></span></i></p>
<p style="background:white"><b><i><span style="font-size:7.5pt;font-family:&quot;Verdana&quot;,sans-serif;color:#929292">Tá an ríomhphost seo agus aon chomhad a sheoltar leis faoi rún agus is lena úsáid ag an seolaí agus sin amháin é.
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Is féidir tuilleadh a léamh anseo.&nbsp;</a></span></i></b><i><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;"><o:p></o:p></span></i></p>
<p style="background:white"><b><i><span style="font-size:7.5pt;font-family:&quot;Verdana&quot;,sans-serif;color:#929292">This e-mail and any files transmitted with it are confidential and are intended solely for use by the addressee.
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Read more here.</a></span></i></b><i><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;"><o:p></o:p></span></i></p>
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<pre style="background:white"><i><span style="font-size:7.5pt;font-family:&quot;Verdana&quot;,sans-serif;color:#929292"><o:p>&nbsp;</o:p></span></i></pre>
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<pre style="background:white"><i><span style="font-size:7.5pt;font-family:&quot;Verdana&quot;,sans-serif;color:#929292"><o:p>&nbsp;</o:p></span></i></pre>
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