Slow Archiving.

Question

Hi,
I have O9i Prod & stdby DB. On Prod DB I have 9 Redo Log groups with 1 member each with 50MB each. The Stdby DB is config for Max Performance mode. Whenever there is a heavy lod on the DB than the Archiving process becomes very slow. At that time if I chk the alert log file, I see the following msg:
"ARC1: Unable to archive log 4 thread 1 sequence 9587
Log actively being archived by another process"
Following para are set on the prod DB:
-->log_archive_max_processes = 4
--> archive_lag_target = 3600
- log_archive_dest_2 service="(DESCRIPTION=(ADDRESS
_LIST = (ADDRESS=(PROTOCOL=tcp
)(HOST=xxx.xxx.x.xx)(PORT=1521
)))(CONNECT_DATA=(SID=xx)(OR
ACLE_HOME=/oracle/ora9/OraHome
)(SERVER=DEDICATED)))", ARCH S
YNC NOAFFIRM delay=180 OPTIONA
L max_failure=0 reopen=300
Please advice.
Also pls let me know that in the max perf mode for stby db:
1) does Arch process creates the Arch log files 1st on the Prim & then on the Stdby & after that it creates the next Archive log
or
2)does the Arch process creates the Arch log files simultaneously on both DB & after that it creates the next Archive log
or
3) 1st Arch process creates the Arch log files the Prim & then creates the next Archive log on Prim independent of the Archive log copy on the Stdby
Thank You.

Answer 1

Hi
I guess the "slow archiving" under hevy load is because You have many log switch with full checkpoints. So You should change from 50MB to biggest the redolog file" size, eg 100MB or bigger.
If there are 2 archive destination and You have 2 archive processes then the archiving will be "parallel".
lajos