Note that deleting the CDC instance also drops the associated change data database. Also, since that script must be executed with sufficient privileges, there is a good chance that it will have to be handed over to an Oracle DBA. Overall, this feature can significantly improve the quality of SQL Server data warehousing projects that source some or all of their data from Oracle. If this happens, temporarily suspend the Oracle database workload, if possible, or wait until a period of low activity in the Oracle database. CDC services can be clustered as a Generic Service resource. Instead, permissions are granted to the service identity using per-service SID. These steps require holding sufficient privileges in the Oracle database; therefore, you may need to work with an Oracle DBA who can run corresponding scripts. 
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This means that you can monitor each CDC instance by querying these tables. Note that the same CDC service may be associated with more than one CDC instance in our case we could have used a single CDC service to capture changes from both of our source Oracle databases. The second script creates mirror tables and capture instances in the change data database.
To design orcale-cdc CDC instances, we used a specific workflow that resulted in a set of deployment scripts. This includes status changes, errors, etc. One caveat here is that the asymmetric key password is subject to password complexity rules in effect on the Windows server.
This is done by executing the following: When clustering the CDC service, it must be first installed in an identical fashion on all nodes of the cluster. In addition to the output from Collect Diagnosticsif the problem seems to be related to the Oracle database and Log Miner, then it is also helpful to include the output from the following Oracle queries, which shows the state attynity online and archived logs: Once deleted, we can go ahead and execute the three scripts described above in the same sequence, which should result in a new CDC instance, configured as desired.
In this scenario, you may also run into a kind of a chicken and egg problem. Trace data is very helpful in troubleshooting CDC instance configuration and operation problems. While we did not find out the root cause for the CDC service not creating the key for a new change data database, in all such cases restarting the CDC service caused the key to be created, and allowed this script to iracle-cdc.
Data warehousing – Data, Design, and SQL Server
The change data database created by the wizard uses the default database options of the model database, which may or may not be optimal for your purposes. When specifying Oracle connection info, you can enter it in the format suggested on the wizard page host: Specifically, column order in some tables was different. Step 5 Split the generated deployment script into three parts: As of this writing, the only way to determine which version is installed is to check the properties of files on disk in C: The part of the third script that does all this looks like this: If your requirement is not to miss any changes, you will need to restart data capture and run the initial load again.
Once the CDC instance is processing changes, you can start the initial load from the source Oracle database into the destination SQL Server database, and once that completes, start running incremental loads.
- Attunity CDC for SSIS
Step 2 If you have not added any source tables while running the wizard, do that now. More detailed tracing can be enabled by setting the trace option to 1. You can add tables in batches — each batch will be saved with the CDC instance.
The purpose of this blog is to make it easier for SQL Server developers and DBAs who are working on data warehousing projects to discover, implement, and support this feature. It is entirely attunitu to create an empty CDC instance and add tables later.
If so, it is highly recommended to collect a set of diagnostic information for the support engineers actually this may help you in your troubleshooting efforts as well. When a capture instance is created for a table in a CDC enabled database, the sys.
Tag: Data warehousing
If this happens, temporarily suspend the Oracle database workload, if possible, or wait until a period of low activity in the Oracle database. Character data types in the deployment script generated by the CDC Designer console were doubled.
This list is by no means comprehensive, but may provide some helpful troubleshooting ideas and odacle-cdc. Not everything mentioned here will necessarily be applicable or even optimal on other such projects.
As noted earlier, this either causes the capture instance for the table to be dropped, or stops data capture altogether. Each mirror table has exactly the same column names as the Oracle table, these columns are in the same oraclf-cdc as in the Oracle table, and have data types that match the Oracle data types as closely as possible. Mirror tables are used to create capture instances in the change data database by calling the sys.
Our initial assumption was that the database schemas of the two Oracle databases must be the same, too.
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