Repository Performance Tuning

You can use the Informatica features to improve the performance of the repository. You can update statistics and skip information when you copy, back up, or restore the repository.

Almost all PowerCenter repository tables use at least one index to speed up queries. Most databases keep and use column distribution statistics to determine which index to use to execute SQL queries optimally. Database servers do not update these statistics continuously.

In frequently used repositories, these statistics can quickly become outdated, and SQL query optimizers might not choose the best query plan. In large repositories, choosing a sub-optimal query plan can have a negative impact on performance. Over time, repository operations gradually become slower.

Informatica identifies and updates the statistics of all repository tables and indexes when you copy, upgrade, and restore repositories. You can also update statistics using the pmrep UpdateStatistics command.

Large repositories can contain a large volume of log and historical information that slows down repository service performance. This information is not essential to repository service operation. When you back up, restore, or copy a repository, you can choose to skip the following types of information:

By skipping this information, you reduce the time it takes to copy, back up, or restore a repository.

You can also skip this information when you use the pmrep commands.