How to reduce excessive redo log generation in Oracle 10G
Hi All,
Please let me know is there any way to reduce excessive redo log generation in Oracle DB 10.2.0.3
previously per day there is only 15 Archive log files are generating but now a days it is increased to 40 to 45
below is the size of redo log file members:
L.BYTES/1024/1024 MEMBER
200 /u05/applprod/prdnlog/redolog1a.dbf
200 /u06/applprod/prdnlog/redolog1b.dbf
200 /u05/applprod/prdnlog/redolog2a.dbf
200 /u06/applprod/prdnlog/redolog2b.dbf
200 /u05/applprod/prdnlog/redolog3a.dbf
200 /u06/applprod/prdnlog/redolog3b.dbf
here is the some content of alert message for your reference how frequent log switch is occuring:
Beginning log switch checkpoint up to RBA [0x441f.2.10], SCN: 4871839752
Thread 1 advanced to log sequence 17439
Current log# 3 seq# 17439 mem# 0: /u05/applprod/prdnlog/redolog3a.dbf
Current log# 3 seq# 17439 mem# 1: /u06/applprod/prdnlog/redolog3b.dbf
Tue Jul 13 14:46:17 2010
Completed checkpoint up to RBA [0x441f.2.10], SCN: 4871839752
Tue Jul 13 14:46:38 2010
Beginning log switch checkpoint up to RBA [0x4420.2.10], SCN: 4871846489
Thread 1 advanced to log sequence 17440
Current log# 1 seq# 17440 mem# 0: /u05/applprod/prdnlog/redolog1a.dbf
Current log# 1 seq# 17440 mem# 1: /u06/applprod/prdnlog/redolog1b.dbf
Tue Jul 13 14:46:52 2010
Completed checkpoint up to RBA [0x4420.2.10], SCN: 4871846489
Tue Jul 13 14:53:33 2010
Beginning log switch checkpoint up to RBA [0x4421.2.10], SCN: 4871897354
Thread 1 advanced to log sequence 17441
Current log# 2 seq# 17441 mem# 0: /u05/applprod/prdnlog/redolog2a.dbf
Current log# 2 seq# 17441 mem# 1: /u06/applprod/prdnlog/redolog2b.dbf
Tue Jul 13 14:53:37 2010
Completed checkpoint up to RBA [0x4421.2.10], SCN: 4871897354
Tue Jul 13 14:55:37 2010
Incremental checkpoint up to RBA [0x4421.4b45c.0], current log tail at RBA [0x4421.4b5c5.0]
Tue Jul 13 15:15:37 2010
Incremental checkpoint up to RBA [0x4421.4d0c1.0], current log tail at RBA [0x4421.4d377.0]
Tue Jul 13 15:35:38 2010
Incremental checkpoint up to RBA [0x4421.545e2.0], current log tail at RBA [0x4421.54ad9.0]
Tue Jul 13 15:55:39 2010
Incremental checkpoint up to RBA [0x4421.55eda.0], current log tail at RBA [0x4421.56aa5.0]
Tue Jul 13 16:15:41 2010
Incremental checkpoint up to RBA [0x4421.58bc6.0], current log tail at RBA [0x4421.596de.0]
Tue Jul 13 16:35:41 2010
Incremental checkpoint up to RBA [0x4421.5a7ae.0], current log tail at RBA [0x4421.5aae2.0]
Tue Jul 13 16:42:28 2010
Beginning log switch checkpoint up to RBA [0x4422.2.10], SCN: 4872672366
Thread 1 advanced to log sequence 17442
Current log# 3 seq# 17442 mem# 0: /u05/applprod/prdnlog/redolog3a.dbf
Current log# 3 seq# 17442 mem# 1: /u06/applprod/prdnlog/redolog3b.dbf
Thanks in advance
hi,
Use the below script to find out at what hour the generation of archives are more and in the hour check for eg. if MV's are running...or any programs where delete * from table is going on..
L
1 select
2 to_char(first_time,'DD-MM-YY') day,
3 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'00',1,0)),'999') "00",
4 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'01',1,0)),'999') "01",
5 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'02',1,0)),'999') "02",
6 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'03',1,0)),'999') "03",
7 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'04',1,0)),'999') "04",
8 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'05',1,0)),'999') "05",
9 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'06',1,0)),'999') "06",
10 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'07',1,0)),'999') "07",
11 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'08',1,0)),'999') "08",
12 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'09',1,0)),'999') "09",
13 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'10',1,0)),'999') "10",
14 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'11',1,0)),'999') "11",
15 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'12',1,0)),'999') "12",
16 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'13',1,0)),'999') "13",
17 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'14',1,0)),'999') "14",
18 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'15',1,0)),'999') "15",
19 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'16',1,0)),'999') "16",
20 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'17',1,0)),'999') "17",
21 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'18',1,0)),'999') "18",
22 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'19',1,0)),'999') "19",
23 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'20',1,0)),'999') "20",
24 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'21',1,0)),'999') "21",
25 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'22',1,0)),'999') "22",
26 to_char(sum(decode(substr(to_char(first_time,'HH24'),1,2),'23',1,0)),'999') "23",
27 COUNT(*) TOT
28 from v$log_history
29 group by to_char(first_time,'DD-MM-YY')
30 order by daythanks,
baskar.l
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1 select
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27 COUNT(*) TOT
28 from v$log_history
29 group by to_char(first_time,'DD-MM-YY')
30 order by day
31*
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DAY 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 TOT
01-07-10 29 19 10 8 8 13 12 19 24 20 10 16 10 10 33 24 23 26 27 32 25 13 8 11 430
02-07-10 9 8 8 8 8 8 10 8 15 8 10 8 8 9 44 30 14 8 25 11 8 12 9 11 297
03-07-10 10 9 8 8 8 8 9 13 14 18 14 22 16 14 10 8 9 10 9 12 10 11 9 11 270
04-07-10 10 8 8 9 8 8 8 9 13 9 8 17 10 8 10 13 14 8 9 11 9 10 8 11 236
05-07-10 10 8 9 8 8 8 9 8 16 14 11 9 10 8 9 10 8 19 13 16 8 10 9 11 249
06-07-10 10 8 9 8 8 8 9 12 13 15 9 8 10 12 13 11 10 9 10 11 13 9 8 11 244
07-07-10 10 11 8 8 8 8 9 8 15 8 19 10 19 14 12 10 21 9 8 12 9 9 14 17 276
08-07-10 13 9 8 8 8 8 9 14 13 11 8 8 13 9 8 21 8 8 13 9 8 9 8 8 239
09-07-10 10 8 8 8 9 8 10 12 15 9 8 14 8 9 19 9 8 8 16 8 9 8 8 9 238
10-07-10 9 9 8 8 8 8 9 14 14 10 8 8 9 9 13 8 8 8 8 9 8 9 8 8 218
11-07-10 10 8 9 8 8 8 9 11 14 8 8 8 8 9 8 8 9 8 10 8 8 8 8 8 209
12-07-10 10 9 8 8 8 8 9 12 14 11 14 13 8 13 13 9 8 13 10 8 10 8 8 8 240
13-07-10 9 12 8 8 8 8 8 14 16 17 11 9 12 17 12 11 9 9 8 15 9 12 11 8 261
14-07-10 10 12 8 8 8 8 9 12 14 10 8 8 8 8 9 9 8 8 9 9 9 31 52 40 315
15-07-10 16 8 9 8 8 8 12 10 17 9 13 16 9 11 8 15 8 10 15 12 8 12 8 8 258
16-07-10 10 9 8 8 8 8 9 11 15 11 14 12 20 8 9 9 9 8 8 12 10 8 8 8 240
17-07-10 10 8 8 8 8 8 8 12 16 10 15 8 9 8 9 8 8 8 9 8 8 9 8 8 219
18-07-10 11 10 8 8 8 8 8 8 10 9 10 8 9 12 16 10 9 8 8 8 8 8 10 8 220
19-07-10 10 9 8 8 8 8 9 4 15 9 8 9 8 8 9 11 9 8 17 8 21 8 8 8 228
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24-07-10 10 9 8 8 8 8 8 12 14 9 8 8 10 9 9 9 8 11 12 8 8 8 8 8 218
25-07-10 10 8 9 8 8 8 9 8 14 9 8 8 8 9 8 9 8 10 8 9 9 8 8 8 209
26-07-10 10 9 8 8 8 8 9 9 13 10 8 14 8 8 10 19 24 10 27 37 36 23 8 9 333
27-07-10 9 9 8 8 8 8 8 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 64
30-06-10 0 1 49 11 9 8 15 8 8 15 17 25 16 27 28 9 13 9 12 14 12 28 40 43 417
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