Log File Catalog

The performance log file catalog is an index of all of the data values in a binary performance log file. This can speed access to particular values in large performance log files while it increases the size of the file slightly. By default, performance log files are created without a catalog.

You can choose to create a catalog in a log file when it is created, or create a catalog in an existing log file that does not have one. Catalogs should be updated when the performance data collection session is ended and the query has been closed. They can be updated at any time, but updating the catalog while collecting data will slow the data collection.

Performance log files in the CSV, TSV, and Perfmon format cannot contain catalogs.