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Merge pull request #37519 from MicrosoftDocs/main
Auto Publish – main to live - 2026-06-25 17:30 UTC
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‎docs/integration-services/change-data-capture/known-issues-resolutions-with-cdc-for-oracle-attunity.md‎

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- Changes are lost
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- The capturing of events can go into an infinite loop and stop capturing new data changes (related to Oracle bug 5623813). When on Oracle RAC environment is performing a stop or resume of the CDC instance, changes can be skipped/lost. This means the SQL Server change data capture will be missing important rows, and thus there is data loss in the data warehouse or subscribing system. Fixed in the _Service Pack 1 release for SQL Server 2012_. See [SP1 Feature Pack download page](https://www.microsoft.com/download/details.aspx?id=35575)
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- Double widths on columns in SQL
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- When creating a CDC for Oracle instance, in the scripts to run against SQL Server, the length of a variable width data type column is doubled in SQL Server tables that are created in the script. For example, if you try to track changes on a VARCHAR2(10) column in an Oracle table, then the corresponding column in the SQL Server table is NVARCHAR(20) in the deployment script. Fix in either _Cumulative Update 2 for SQL Server 2012 SP1_ or _Cumulative update 5 for SQL Server 2012_ as described in KB [2769673](https://support.microsoft.com/kb/2769673).
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- DDL Data is truncated
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- When you run a Data Definition Language (DDL) statement that is more than 4,000 bytes against an Oracle database that contains non-Latin characters, CDC for Oracle by Attunity fails. Additionally, you see the error message `ORA-01406: fetched column value was truncated.`. Fixed in _Cumulative Update 4 for SQL Server 2012 SP1_.
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- Changes are lost in last two columns

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