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

APAR # Area Text PTF and Notes
PQ85843 Data sharing Castout to skip 180CI limit if serviceability IFCID
338 on to remove CPU spikes every 15 sec caused
by excessive unlock castout and delete namelist.
V8 PQ86071 4/04 unconditionally for all async I/O
such as DASD read and castout.
PQ86037 Insert Insert at end option for Member Cluster TS, with
Alter TS for 0 PCTFREE and FREEPAGE to always
search forward for free space in Insert into MC TS
to avoid periodically reading space map pages
from the beginning costing >10sec, also heavy
space map latch contention, for any page size.
Load Replace dummy or REORG as needed if
deletes later.
PQ86049 Data sharing Request preference for CFLEVEL 13 instead of 7
for GBP allocation to reduce high CF utilization and
use read castout class
PQ86477 IFC The IFCID flat file for V7 and V8 now contains
current information.
PQ87126 Virtual
storage
Excessive DBM1 VS use with KEEPDYN Y and
input decimal hv (also V8)
PQ87381 Insert Insert performance suffers because of exhaustive
search for space to extending the page set
PQ87447 Catalog
query
Query 5 and 18 of the DSNTESQ catalog
consistency queries perform slowly
PQ87783 Data sharing Correct false contention counter when 1 member in
LPAR. If multiple members in the same data
sharing group on the same LPAR (rather rare),
false contention overreported. Needs DB2 PE fix
as of 8/04
PQ87917 I/O I/O performance on ESS/2105 devices can be
improved by utilizing the "bypass read/write
serialization" option. It is already done for writer,
this APAR adds support for reader.
Support R/W I/O concurrency in same defined
domain (but not same track). ESS “bypass define
extent serialization” set by DB2 is disabled when
XRC/PPRC/FlashCopy in progress.
PQ88587 Load LOAD utility with STATISTICS INDEX keywords
specified at many tables present, appears to loop
and completes with high elapsed time.
PQ89191 Load Load zero rows into a DEFINE NO TABLESPACE
sets the non partitioning index to RBDP, not leaving
it in RW.
PQ89297 FLA FLA performance enhancement with priority of Log
Apply phase in RECOVER and RESTORE utility
inherits that of the utility batch job instead of
preempted SRB priority
388 DB2 UDB for z/OS Version 8 Performance Topics
UQ86458
UQ86868
also V8 (PQ87391) +PQ99524
UQ87321
UQ92474
also in V8
UQ88970
UK06753
also in V8
UQ90653
also in V8
UQ88734
UQ886790
also in V8
UQ89026
UQ91968
also in V8
UQ92066
(and V8 for Restore)