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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiYzAyNmQ3YWE1NTMzNDI5ZThlOWZlMmFmYmE1Mzg1MDUiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-13843?atlOrigin=eyJpIjoiYzAyNmQ3YWE1NTMzNDI5ZThlOWZlMmFmYmE1Mzg1MDUiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-424af044-3d0b-4dd9-bf08-cda3db6f84d0" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-13843?atlOrigin=eyJpIjoiYzAyNmQ3YWE1NTMzNDI5ZThlOWZlMmFmYmE1Mzg1MDUiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HHH-13843</a> </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="francois.vandelft" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_francois.vandelft" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5ce578ac3b428d0dcd7ca883"> Francois van Delft </a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <span class="diffcontext">In our use case I noticed a serious slowdown in schema migration after upgrading from 4.3 => 5.4.<br><br>For this I created a fix, that reads the tables in DatabaseInformationImpl for the whole namespace in one go, instead of one at a time. See attached patch too.<br><br>Schema migration with 5.4.10-final => 2 minutes 38 seconds <br>Schema migration with 5.4.11-final with cache: 1 minute 20 seconds<br><br>In our test case this concerns 559 classes that map to about 2400 tables. This is a default empty environment, depending on the usage exceeding 3000 tables is common.</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br>For now I implemented the instance creation of {{DatabaseInformationCachedImpl}} directly in class: {{GroupedSchemaMigratorImp.java }}<br><br>Did not see added value in putting the instance creation of “{{DatabaseInformationCachedImpl}}“ to {{org.hibernate.tool.schema.internal}}.Helper <br><br>feel tree to change however.</span> </td>
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