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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" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-11740" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-082fc72f-6e8c-4382-beb4-50c30d999b70" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11740" style="color: #3b73af; text-decoration: none">HHH-11740</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-11740" style="color: #3b73af; text-decoration: none">Default MultiTableBulkIdStrategy for DB2 does not work with connection pools</a> </span> </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-avatar-082fc72f-6e8c-4382-beb4-50c30d999b70" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </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"> hibernate-core </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"> 11/May/2017 19:53 PM </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-major-4ffaeffd-080c-4c04-a6b2-53f1c012dae7" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </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="gbadner" id="email_gbadner" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=gbadner" style="color:#6c797f;; color: #3b73af; text-decoration: none">Gail Badner</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"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">For DB2, Hibernate creates a temporary table using:<br> <tt>declare global temporary table session.HT_<baseName>(...)</tt></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Starting in Hibernate ORM 5.0, Hibernate assumes this really is a "global" temporary table (created by <tt>GlobalTemporaryTableBulkIdStrategy</tt>) that can be created by the <tt>SessionFactory</tt>, and shared between different sessions. Unfortunately, for DB2, that temp table will only be defined for the particular session in which it is declared.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This was not a problem prior to 5.0, because, up until 4.3, Hibernate treated temp tables as "local" to the current session, creating the temp tables as needed for each multi-table "bulk" operation, then dropping it (if necessary) after the statement was executed.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Starting in DB2 9.7, "real" global temporary tables (that can be shared between sessions) are supported. The DDL for creating it should be:<br> <tt>create global temporary table HT_<baseName>(...)</tt></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The document has a good explanation of the differences. <span class="error">[2]</span></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><span class="error">[3]</span> is specific to "declare global temporary table ...".</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><span class="error">[4]</span> is specific to "create global temporary table ...".</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I believe we need 2 different implementations of Dialect#getDefaultMultiTableBulkIdStrategy for DB2:</p>
<ul>
<li>for pre-9.7, DB2Dialect needs return a MultiTableBulkIdStrategy that behaves like in 4.3;</li>
<li>for 9.7 and later, DB297Dialect needs to return a GlobalTemporaryTableBulkIdStrategy that uses "create global temporary table HT_<baseName>" to create the temp table and does not prefix the table name with <tt>session.</tt>.</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><span class="error">[1]</span> <a href="https://github.com/hibernate/hibernate-orm/blob/5.0/hibernate-core/src/main/java/org/hibernate/dialect/DB2Dialect.java#L398-L419" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/hibernate/hibernate-orm/blob/5.0/hibernate-core/src/main/java/org/hibernate/dialect/DB2Dialect.java#L398-L419</a><br> <span class="error">[2]</span> <a href="https://www.ibm.com/developerworks/data/library/techarticle/dm-0912globaltemptable/" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://www.ibm.com/developerworks/data/library/techarticle/dm-0912globaltemptable/</a><br> <span class="error">[3]</span> <a href="https://www.ibm.com/support/knowledgecenter/en/SSEPGG_9.7.0/com.ibm.db2.luw.sql.ref.doc/doc/r0003272.html" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://www.ibm.com/support/knowledgecenter/en/SSEPGG_9.7.0/com.ibm.db2.luw.sql.ref.doc/doc/r0003272.html</a><br> <span class="error">[4]</span> <a href="https://www.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.wn.doc/doc/c0053706.html" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://www.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.wn.doc/doc/c0053706.html</a></p> </td>
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