Change Data Capture in SQL Server

Post Author: rtamanji
CA Forum: Data Integration
I am having primary key constraint problems whenever there is a failure during the data flow from the source to the target, and I have to restart the process. It looks like check points only occurs if the data flows completely ends. How often are these check points initiated ? The AL table keeps track of this value, is there a similarly table to determine the last record read ? Or does DI reads the entire Repcmd table using the last xact_seqno stored ? Thanks for any information.

It is not using triggers. The source is the transaction log.
Related link:
Basics of Change Data Capture
...The source of change data for change data capture is the SQL Server transaction log. As inserts, updates, and deletes are applied to tracked source tables, entries that describe those
changes are added to the log. The log serves as input to the change data capture capture process. This reads the log and adds information about changes to the tracked table’s associated change table. Functions are provided to enumerate
the changes that appear in the change tables over a specified range, returning the information in the form of a filtered result set. The filtered result set is typically used by an application process to update a representation of the source in some external
environment. ...
Kalman Toth, SQL Server & Business Intelligence Training; SQL Server 2008 Training

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    Mike Yin
    TechNet Community Support

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    Mark ANSWER if this reply resolves your query, If helpful then VOTE HELPFUL
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    Mohammad Nizamuddin
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  • Syncronous Change Data Capture.

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  • Can CDC (Change Data Capture) Can be used for Audit / Trail Purposes

    Hi,
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  • Query on Change Data Capture

    Hi,
    A small clarification on oracle CDC(change data capture),if the CDC is down for 6 hours due to some issues how do I capture all the source transactions into CDC views during this window?
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    Oracle CDC is all about capturing changes in DB tables and the changes are stored in special Oracle tables. There are two modes of CDC operation: asynchronous (based on Java) or synchronous (based on DB triggers, more performance overhead).
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    http://docs.oracle.com/cd/B13789_01/server.101/b10736/cdc.htm#i1025409
    http://docs.oracle.com/cd/E14571_01/integrate.1111/e12643/data_capture.htm

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