hi, dba friends:
some paper said, pqo should only be used in SMP machines, while others say,
We can also use pqo in uniprocessor machines in some case.
I am trying to use parallel index creation in the following env:
Dell 1650 with 3 scsi160 disks and 1 CPU and 2G memory.
Oracle 9.2
Table contains 22000000 records,1.2GB
Table tablespace contains 3 datafiles , 400M, 400M and 600M, on seperate 3 disks.
Index tablespace contains 3 datafiles, 200M, 200M and 200M on seperate 3 disks.
SQL> set term on timing on echo on feedback on
SQL> alter session set sort_area_size = 100000000;
Session altered.
Elapsed: 00:00:00.01
SQL> create index idx_serial on viewcount( SID_LIST) nologging parallel (degree 2)
tablespace pqind;
Index created.
Elapsed: 00:18:01.36
SQL> drop index idx_serial;
Elapsed: 00:00:00.16
SQL> create index idx_serial on viewcount( SID_LIST) nologging tablespace pqind;
Elapsed: 00:06:48.04
This machine is exclusived used my me and It seems that PQO is rather slower
than single thread. So is it still possible to use PQO on single processor machines?
Please share your experience and idear.
Thanks.
Wait event like:
Top 5 Timed Events
~~~~~~~~~~~~~~~~~~ % Total
Event Waits Time (s) Ela Time
-------------------------------------------- ------------ ----------- --------
PX qref latch 48,371 415 40.94
PX Deq: Execute Reply 176 340 33.54
PX Deq Credit: send blkd 47,704 248 24.47
control file parallel write 112 5 .48
PX Deq Credit: need buffer 1,835 4 .38
-------------------------------------------------------------
^LWait Events for DB: ORA9 Instance: ora9 Snaps: 19 -20
-> s - second
-> cs - centisecond - 100th of a second
-> ms - millisecond - 1000th of a second
Regards
zhu chao
msn:[EMAIL PROTECTED]
www.happyit.net
www.cnoug.org(China Oracle User Group)
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