DB2 UDB for z/OS Version 8 Performance Topics - IBM Redbooks

This message is completed with the COLLECTION-ID if available, see Example 4-6.
Example 4-6 DSNI031I - Lock escalation
DSNI031I -D8F1 DSNILKES - LOCK ESCALATION HAS
OCCURRED FOR
RESOURCE NAME = DSNDB04.SSECQTY0
LOCK STATE = X
PLAN NAME : PACKAGE NAME = DSNESPCS : DSNESM68
COLLECTION-ID = DSNESPCS
STATEMENT NUMBER = 000063
CORRELATION-ID = PAOLOR6
CONNECTION-ID = TSO
LUW-ID = USIBMSC.SCPD8F1.BC1C562B4800
THREAD-INFO = PAOLOR6 : * : *
4.12.4 Accounting enhancements
In addition to reducing the overhead of collecting class 2 and class 3 accounting information,
a number of other enhancements have also been made to the accounting trace records.
Accounting roll-up for DDF and RRSAF threads
To avoid flooding the system with accounting records, DB2 V8 allows applications coming into
DB2 through DDF or RRS to roll up the accounting information of individual “transactions” into
a single record that is written out at a user-defined interval.
Package level accounting
DB2 V8 adds SQL, buffer pool, and locking counters to package level accounting. As before,
the gathering of package level accounting level information is triggered by activating
accounting trace classes 7 and 8. This is especially important for applications that come in
through the network via DRDA, since they only execute packages, not plans, and they
produce a large amount of accounting-related information.
The new SQL counters collected at the package level are:
► The number of SELECT statements
► The number of INSERT statements
► The number of UPDATE statements
► The number of DELETE statements
► The number of DESCRIBE statements
► The number of PREPARE statements
► The number of OPEN statements
► The number of CLOSE statements
► The number of FETCH statements
► The number of LOCK TABLE statements
► The number of SQL CALL statements
The buffer pool counters at the package level are identical to those you have in today’s plan
level accounting record. However, there is only one section for all buffer pools used by the
package. For example, if the package did 5 getpages for objects in BP1 and 9 getpages for
objects in BP2, in the package level buffer pool section, you find 14 getpages.
Note, however, that adding up the numbers in the buffer pool sections of all packages touched
by a plan, may not add up to the same number that is shown at the plan level. This can be the
case because DB2 does some work while the plan is running but before the package is
208 DB2 UDB for z/OS Version 8 Performance Topics