You can use an END QUERY LOGGING request like the following to end all the rules in the DBC.DBQLRuleTbl.
END QUERY LOGGING ON ALL RULES;
However, between the time all the rules have been ended and a new rule has begun with newly specified options, logging does not take place for the specified user, application, or account.
To avoid this problem, the REPLACE QUERY LOGGING statement simply replaces an existing rule using a request like one of the following.
REPLACE QUERY LOGGING WITH options ON user_name ACCOUNT = 'acct_ID'
REPLACE QUERY LOGGING WITH options on APPL_NAME=application_name;