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<td class="page-title-pattern-first-line " style="padding: 0px; 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-10374" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-a935d3c9-58e1-43f8-b608-758fc9f37d49" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10374" style="color: #3b73af; text-decoration: none">HHH-10374</a> </td>
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<td style="vertical-align: top;; padding: 0px; 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-10374" style="color: #3b73af; text-decoration: none">Sequence sharing with different settings of increment produces duplicate keys</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: 0px; 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-a935d3c9-58e1-43f8-b608-758fc9f37d49" 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">Affects Versions:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 4.3.10 </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">Assignee:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </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">Components:</th>
<td style="padding: 0px; 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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 11/Dec/2015 03:22 AM </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">Environment:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> MSSQL, PostgreSQL </td>
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<td class="has-icon" style="padding: 0px; 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-minor-7485003f-c58d-4829-8c35-8fdd55784e22" height="16" width="16" border="0" align="absmiddle" alt="Minor" style="vertical-align: text-bottom"> Minor </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: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="raymond" id="email_raymond" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=raymond" style="color:#6c797f;; color: #3b73af; text-decoration: none">Raymond Darius</a> </td>
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<table class="text-paragraph-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 2px">
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">It is not an error to share a Sequence in different mappings but with different Values for <tt>increment_size</tt>.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">This reliably leads to insertion of duplicate keys.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Guesswork:<br> All in a rather tangled fashion since duplicate keys are generated for one Table, when you would expect it to at least be consistent internally for one mapping. But the mapping with the lower Value for <tt>increment_size</tt> probably resets the Generator and then the larger one steps back.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Sensible Solution:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Do a Validation phase when reading the Mapping and check for parameter consistency between all Sequences that are shared.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Possibly give an explanation in the error how to find out the <tt>increment_size</tt> in the database and to set it in all mappings to that value.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">New Style Sequence Generator is used.</p> </td>
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