Oracle 9.2.0.4 / AIX 5.1
I'm looking at an issue with redo log switches.
As far as I know, a log switch will only happen
A) if the log is full
B) if someone enters an "alter system switch logfile"
C) if archive_log_target is set
I've been asked why there would be a log switch in less than a minute
(the redo logs are all 400 MB in size). The only answer I could think of
is that there is a lot of activity in the database. Is there some
possibility I'm overlooking?
In this case I don't have access to the server, but here is a short
snippet from the alert log:
Sun May 9 01:25:58 2004
Beginning log switch checkpoint up to RBA [0x31231.2.10], SCN:
0x025d.246ab5bd
Thread 1 advanced to log sequence 201265
Current log# 22 seq# 201265 mem# 0: /oracle/PD2/origlogB/log_g22m1.dbf
Current log# 22 seq# 201265 mem# 1: /oracle/PD2/mirrlogB/log_g22m2.dbf
Sun May 9 01:25:58 2004
ARC1: Evaluating archive log 21 thread 1 sequence 201264
ARC1: Beginning to archive log 21 thread 1 sequence 201264
Creating archive destination LOG_ARCHIVE_DEST_1:
'/oracle/PD2/saparch/PD2arch1_201264.dbf'
ARC1: Completed archiving log 21 thread 1 sequence 201264
Sun May 9 01:26:00 2004
Completed checkpoint up to RBA [0x31230.2.10], SCN: 0x025d.246a6860
Beginning global checkpoint up to RBA [0x31231.10fa9.10], SCN:
0x025d.246ab65b
Completed checkpoint up to RBA [0x31231.10fa9.10], SCN: 0x025d.246ab65b
Completed checkpoint up to RBA [0x31231.2.10], SCN: 0x025d.246ab5bd
Sun May 9 01:26:34 2004
Beginning log switch checkpoint up to RBA [0x31232.2.10], SCN:
0x025d.246abab2
Thread 1 advanced to log sequence 201266
Current log# 27 seq# 201266 mem# 0: /oracle/PD2/origlogA/log_g27m1.dbf
Current log# 27 seq# 201266 mem# 1: /oracle/PD2/mirrlogA/log_g27m2.dbf
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Received on Fri Jun 04 2004 - 15:35:25 CDT
