catalog.cleanup_server_log
Applies to: 
SQL Server
SSIS Integration Runtime in Azure Data Factory
Applies to:
SQL Server
Cleans up operation logs to bring the SSISDB database into a state that lets you change the value of the SERVER_OPERATION_ENCRYPTION_LEVEL property.
Syntax
catalog.cleanup_server_log
Arguments
None.
Return Code Values
0 for success and 1 for failure.
Result Sets
None.
Permissions
This stored procedure requires one of the following permissions:
READ and EXECUTE permissions on the project and, if applicable, READ permissions on the referenced environment.
Membership in the ssis_admin database role.
Membership to the sysadmin server role.
Errors and Warnings
This stored procedure raises errors in the following scenarios:
There are one or more active operations in the SSISDB database.
The SSISDB database is not in single user mode.
Remarks
SQL Server 2012 Service Pack 2 added the SERVER_OPERATION_ENCRYPTION_LEVEL property to the internal.catalog_properties table. This property has two possible values:
PER_EXECUTION (1) - The certificate and symmetric key used for protecting sensitive execution parameters and execution logs are created for each execution. You may run into performance issues (deadlocks, failed maintenance jobs, etc.) in a production environment because certificate/keys are generated for each execution. However, this setting provides a higher level of security than the other value (2).
PER_PROJECT (2) - The certificate and symmetric key used for protecting sensitive parameters are created for each project. PER_PROJECT (2) is the default value. This setting gives you a better performance than the PER_EXECUTION level because the key and certificate are generated once for a project rather than for each execution.
You have to run the catalog.cleanup_server_log stored procedure before you can change the SERVER_OPERATION_ENCRYPTION_LEVEL from 2 to 1 or from 1 to 2. Before running this stored procedure, do the following things:
Ensure that the value of the property OPERATION_CLEANUP_ENABLED is set to TRUE in the catalog.catalog_properties (SSISDB Database) table.
Set the Integration Services database (SSISDB) to single-user mode. In SQL Server Management Studio, launch Database Properties dialog box for SSISDB, switch to the Options tab, and set the Restrict Access property to single-user mode (SINGLE_USER). After you run the cleanup_server_log stored procedure, set the property value back to the original value.
Run the stored procedure catalog.cleanup_server_log.
Now, change the value for the SERVER_OPERATION_ENCRYPTION_LEVEL property in the catalog.catalog_properties (SSISDB Database) table.
Run the stored procedure catalog.cleanup_server_execution_keys to clean up certificates keys from the SSISDB database. Dropping certificates and keys from the SSISDB database may take a long time, so it should be run periodically during off-peak times.
You can specify the scope or level (execution vs. project) and number of keys to be deleted. The default batch size for deletion is 1000. When you set the level to 2, the keys and certificates are deleted only if the associated projects have been deleted.
For more info, see the following Knowledge Base article: FIX: Performance issues when you use SSISDB as your deployment store in SQL Server 2012
Example
The following example calls the cleanup_server_log stored procedure.
USE [SSISDB]
GO
DECLARE@return_value int
EXEC@return_value = [internal].[cleanup_server_log]
SELECT'Return Value' = @return_value
GO