A user-managed cache table is a table in the data object cache database that you create, populate, and manually refresh when needed.
Configure a logical data object or virtual table to use a user-managed cache table when you want to incrementally update the cache. When the Data Object Cache Manager manages the cache, it inserts all data into the cache table with each refresh. If the source contains a large data set, the refresh can take a long time to process. Instead, you can configure the object to use a user-managed cache table and then use an external tool to insert only the changed data into the cache table. For example, you can use a PowerCenter CDC mapping to extract changed data for the objects and incrementally update the cache.
When you configure an object to use a user-managed cache table, you must use a database client or other tool to create, populate, purge, and refresh the cache table. You create the user-managed cache table in the data object cache database that the Data Integration Service accesses with the cache database connection.
You cannot use the Administrator tool or command line tools to manage a user-managed cache table. The Data Integration Service uses the cache stored in the user-managed cache table when it runs a mapping, an SQL data service query, or a web service request that includes the object. However, the Data Object Cache Manager does not manage the cache table. When you use the
tab to monitor an object that uses a user-managed cache table, the object has a cache state of Skipped.
If the user-managed cache table is stored in a Microsoft SQL Server database and the database user name is not the same as the schema name, you must specify a schema name in the database connection object. Otherwise, mappings, SQL data service queries, and web service requests that access the cache fail.