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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=eyJpIjoiYzIxYzhmZjZlYTFmNGUzZjhjYzNhNTQ3MDE2MzRhMTciLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-13331?atlOrigin=eyJpIjoiYzIxYzhmZjZlYTFmNGUzZjhjYzNhNTQ3MDE2MzRhMTciLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-72312ea5-1507-4d18-8ab1-3f7b7a860694" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-13331?atlOrigin=eyJpIjoiYzIxYzhmZjZlYTFmNGUzZjhjYzNhNTQ3MDE2MzRhMTciLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HHH-13331</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-13331?atlOrigin=eyJpIjoiYzIxYzhmZjZlYTFmNGUzZjhjYzNhNTQ3MDE2MzRhMTciLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Query Cache should not be allowed for queris having Non Cacheable Query Spaces</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-72312ea5-1507-4d18-8ab1-3f7b7a860694" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 20/Mar/2019 07:15 AM </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-critical-292f78f8-e6c5-452d-b9b6-13e8e0c178f4" height="16" width="16" border="0" align="absmiddle" alt="Critical" style="vertical-align: text-bottom"> Critical </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Reporter:</th>
<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="debashish.bharali" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_debashish.bharali" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5a867788b01a4c302bf16efa"> Debashish Bharali </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"> <h1 style="margin: 10px 0 0; margin-top: 0; font-size: 24px; font-weight: normal; line-height: 1.250; margin: 40px 0 0; margin-top: 0"><a name="QueryCacheshouldnotbeallowedforquerieshavingNonCacheableQuerySpaces." style="color: #3b73af; text-decoration: none"></a>Query Cache should not be allowed for queries having Non Cacheable Query Spaces.</h1> <h2 style="margin: 10px 0 0; font-size: 20px; font-weight: normal; line-height: 1.500; margin: 40px 0 0; margin-top: 10px"><a name="Analysis%3A" style="color: #3b73af; text-decoration: none"></a>Analysis:</h2>
<ul>
<li>When query is cacheable i.e. 'org.hibernate.cacheable=true', and is having query spaces which are non cacheable, then this may lead to the well known <b>'N+1'</b> issue.</li>
<li>I.e. the cached query result containing the 'N' ids, will further result in N queries of 'findById' to the database.</li>
</ul> <h2 style="margin: 10px 0 0; font-size: 20px; font-weight: normal; line-height: 1.500; margin: 40px 0 0"><a name="Expectation%3A" style="color: #3b73af; text-decoration: none"></a>Expectation:</h2>
<ul>
<li>Query Cache should not be allowed for queries having Non Cacheable Query Spaces. Either throw an exception while loading the query, or rather ignore the query cache in this case.</li>
<li>With this, even high number of puts to <b>'UpdateTimestampCache'</b> can be avoided. Which are originating from all the high number of transactional DMLs being executed to a query space which is non-cacheable.</li>
</ul> <h2 style="margin: 10px 0 0; font-size: 20px; font-weight: normal; line-height: 1.500; margin: 40px 0 0"><a name="PossibleResolution%3Aorg.hibernate.loader.Loader.listmethod" style="color: #3b73af; text-decoration: none"></a>Possible Resolution: org.hibernate.loader.Loader.list method</h2>
<ul>
<li>Maintain a set of cacheable 'query space (String)' - call it Metadata etc</li>
<li>To the existing condition of checking whether cacheable or not, add the check of validating every corresponding query spaces in this Metadata set.</li>
<li>If any of the query space is not in the cacheable metadata set, mark the final boolean variable 'cacheable' as false.</li>
<li>So 'listIgnoreQueryCache' will be called rather than 'listUsingQueryCache'</li>
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