This parameter
indicates the maximum size of the heap used in collecting statistics
using the RUNSTATS command.
The
constraint set by this parameter applies to each RUNSTATS operation.
With Version 9.5, this database configuration parameter has
a default value of AUTOMATIC, meaning that it increases
as needed until either the appl_memory limit
is reached, or the instance_memory limit is reached.
- Configuration type
- Database
- Parameter type
- Configurable online
- Configurable by member in a DB2® pureScale® environment
- Default [range]
- Automatic [1 096 - 524 288]
Note: The default value is subject to change by the DB2 Configuration Advisor after
initial database creation.
- Unit of measure
- Pages (4 KB)
- When allocated
- When the RUNSTATS utility is started
- When freed
- When the RUNSTATS utility is completed
Recommendation: RUNSTATS memory
requirements depend on several factors. More memory is required with
more statistic options, for example if LIKE statistics or DETAILED
index statistics are being collected. When column statistics are
collected, gathering statistics of a higher number of columns will
require more memory. When distribution statistics are being collected,
gathering a higher number of frequent, quantile values, or both will
require more memory. The default setting of AUTOMATIC is
recommended.
DB2 10.5 for Linux, UNIX, and Windows