Limits the amount of memory used for generating an XML version of a query plan when query logging is enabled using the WITH XMLPLAN option of BEGIN QUERY LOGGING.
Field Group
Performance
Valid Range
256 through 65536 KB
Default
8192 KB
Changes Take Effect
After the DBS Control Record has been written.
Usage Notes
The WITH XMLPLAN option of the BEGIN QUERY LOGGING statement causes the query plan for every non-cached DDL, DML, and DCL SQL statement to be logged as an XML document in the Database Query Log (DBQL). This document is stored in the DBC.DBQLXMLTbl system table.
DBQLXMLPlanMemLimit limits the amount of memory used to generate XML for each SQL request. Reducing the amount of memory used to generate XML plans can free up memory for other tasks, however, setting DBQLXMLPlanMemLimit to a value smaller than the default risks that generated XML plan documents will be incomplete.
EXPLAIN, INSERT EXPLAIN, and DUMP EXPLAIN statements are not logged.
Related Information
For more information on query logging, see Teradata Vantage™ - Database Administration, B035-1093 and Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144.