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

Important: With PTFs UK04394 (DB2 V8) and UK04393 (DB2 V7) for APAR PQ99658 the
availability of virtual storage diagnostic record IFCID 225 is added to Statistics Class 1, the
system parameter STATIME default time is reduced from 30 minutes to 5, and an internal
cache of IFCID 225 records is being kept to track storage changes over time.
Example 4-1 shows an extract from a DB2 PE V8.1 Statistics Long Trace, showing the DBM1
STORAGE STATISTICS sections for a DB2 V7 subsystem. The report was produced with the
fix for APAR PQ91101 applied to DB2 V7 and the fix for APAR PQ94872 applied to DB2 PE.
See also 10.2, “DB2 Performance Expert” on page 364, and Appendix B, “The DBM1 storage
map” on page 393.
Example 4-1 DBM1 Storage Statistics for a DB2 V7 subsystem
DBM1 AND MVS STORAGE BELOW 2 GB QUANTITY DBM1 AND MVS STORAGE BELOW 2 GB CONTINUED QUANTITY
-------------------------------------------- ------------------ -------------------------------------------- ------------------
TOTAL DBM1 STORAGE BELOW 2 GB (MB) 779.63 24 BIT LOW PRIVATE (MB) 0.21
TOTAL GETMAINED STORAGE (MB) 599.18 24 BIT HIGH PRIVATE (MB) 0.43
VIRTUAL BUFFER POOLS (MB) 437.50 31 BIT EXTENDED LOW PRIVATE (MB) 24.64
VIRTUAL POOL CONTROL BLOCKS (MB) 13.67 31 BIT EXTENDED HIGH PRIVATE (MB) 794.60
EDM POOL (MB) 146.48 EXTENDED REGION SIZE (MAX) (MB) 1628.00
COMPRESSION DICTIONARY (MB) 0.00 EXTENDED CSA SIZE (MB) 256.83
CASTOUT BUFFERS (MB) 0.00
DATA SPACE LOOKASIDE BUFFER (MB) 0.00 AVERAGE THREAD FOOTPRINT (MB) 0.30
HIPERPOOL CONTROL BLOCKS (MB) 0.00 MAX NUMBER OF POSSIBLE THREADS 2593.01
DATA SPACE BP CONTROL BLOCKS (MB) 0.00
TOTAL VARIABLE STORAGE (MB) 153.39
TOTAL AGENT LOCAL STORAGE (MB) 109.16
TOTAL AGENT SYSTEM STORAGE (MB) 3.54
NUMBER OF PREFETCH ENGINES 5
NUMBER OF DEFERRED WRITE ENGINES 26
NUMBER OF CASTOUT ENGINES 0
NUMBER OF GBP WRITE ENGINES 0
NUMBER OF P-LOCK/NOTIFY EXIT ENGINES 0
TOTAL AGENT NON-SYSTEM STORAGE (MB) 105.63
TOTAL NUMBER OF ACTIVE USER THREADS 500
RDS OP POOL (MB) 1.15
RID POOL (MB) 0.57
PIPE MANAGER SUB POOL (MB) 0.00
LOCAL DYNAMIC STMT CACHE CNTL BLKS (MB) 0.99
THREAD COPIES OF CACHED SQL STMTS (MB) 22.77
IN USE STORAGE (MB) N/A
STATEMENTS COUNT N/A
HWM FOR ALLOCATED STATEMENTS (MB) N/A
STATEMENT COUNT AT HWM N/A
DATE AT HWM N/A
TIME AT HWM N/A
BUFFER & DATA MANAGER TRACE TBL (MB) 16.95
TOTAL FIXED STORAGE (MB) 0.30
TOTAL GETMAINED STACK STORAGE (MB) 26.77
STORAGE CUSHION (MB) 132.58
DBM1 STORAGE ABOVE 2 GB QUANTITY REAL AND AUXILIARY STORAGE QUANTITY
-------------------------------------------- ------------------ -------------------------------------------- ------------------
FIXED STORAGE (MB) N/A REAL STORAGE IN USE (MB) 516.13
GETMAINED STORAGE (MB) N/A AUXILIARY STORAGE IN USE (MB) 0.00
COMPRESSION DICTIONARY (MB) N/A
CACHED DYNAMIC SQL STATEMENTS (MAX) (MB) N/A
DBD CACHE (MAX) (MB) N/A
VARIABLE STORAGE (MB) N/A
VIRTUAL BUFFER POOLS (MB) N/A
VIRTUAL POOL CONTROL BLOCKS (MB) N/A
CASTOUT BUFFERS (MB) N/A
STAR JOIN MEMORY POOL (MB) N/A
The format of the DBM1 Storage Statistics sections of the DB2 PE Statistics Detail Report is
enhanced over previous versions. See DB2 for z/OS and OS/390 Version 7 Selected
Performance Topics, SG24-6894, for an example of the previous report. The new report is
hierarchical, more complete and logically organized.
158 DB2 UDB for z/OS Version 8 Performance Topics