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Is logfile recovery after restoring file backups possible using M AXDB?: msg#00278

db.maxdb

Subject: Is logfile recovery after restoring file backups possible using M AXDB?

Hello,
Instead of using the MAXDB 7.5 tools (backup_start) for a full online
database backup I would like to use the SNAP function on our SAN (hardware).
So I
freeze the MAXDB database by suspending the log writer to create a
consistent
backup (data and log files) with the commands:

dbmcli -D database -uUTL -u dbm,dbm util_execute suspend logwriter

<then I create the SNAPSHOT from the LUN's with the DATA and LOG
volumes (comparable with split mirror) in seconds with the SAN
functionality>

dbmcli -D database -uUTL -u dbm,dbm util_execute resume logwriter

Since database startup, the autologging function is switched on
(autolog_on), so all database actions are logged in number trailered
logfiles. After the SAN backup (in this example a tar file with the LOG
and DATA files) I generate some load up to the point where 6 logfiles
have been written. So I have a full database backup (the tar file) and I
have the
logfiles to perform a point-in-time recovery (rollforward). The next files
are
available for recovery:

-rw-rw---- 1 sdb sdba 5701632 Jan 28 09:39 autoLOG_TESTDB.bak.002
-rw-rw---- 1 sdb sdba 5701632 Jan 28 09:39 autoLOG_TESTDB.bak.003
-rw-r--r-- 1 sdb sdba 999443456 Jan 28 09:40 SNAP_TESTDB.tar
-rw-rw---- 1 sdb sdba 5701632 Jan 28 09:40 autoLOG_TESTDB.bak.004
-rw-rw---- 1 sdb sdba 5701632 Jan 28 09:40 autoLOG_TESTDB.bak.006
-rw-rw---- 1 sdb sdba 5701632 Jan 28 09:40 autoLOG_TESTDB.bak.005
-rw-rw---- 1 sdb sdba 5701632 Jan 28 09:41 autoLOG_TESTDB.bak.007
-rw-rw---- 1 sdb sdba 5701632 Jan 28 09:41 autoLOG_TESTDB.bak.008
-rw-rw---- 1 sdb sdba 5701632 Jan 28 09:41 autoLOG_TESTDB.bak.009

Test recovery:
I shutdown the database (db_stop), I remove the DATA an LOG volume
files and put the SAN SNAPSHOT with the DATA and the LOG volumes back
(the restore from the full database).
1. Restore SNAPSHOT from files as they are:
When I (db_start) online the database, everything is normal, database
is consistent. Everything works fine.
2. Restore SNAPSHOT from files and recover logs (rollforward):
I open the database in db_admin mode, open a utility session and try to
perform
recovery (rollforward) on the database with the 6 logfiles that were created
after
the SAN snapshot (tar file).
After the first recover_start the database is in the db_online state and I
cannot
proceed recovery (LOG 005). I used the next commands in a dbmcli session to
recover:

db_admin
util_connect
recover_start auto_logF LOG 004
recover_replace auto_logF /data/backup/autoLOG_TESTDB.bak005
recover_start auto_logF LOG 005
recover_replace auto_logF /data/backup/autoLOG_TESTDB.bak 006
recover_start auto_logF LOG 006
recover_replace auto_logF /data/backup/autoLOG_TESTDB.bak 007
recover_start auto_logF LOG 007
recover_replace auto_logF /data/backup/autoLOG_TESTDB.bak 008
recover_start auto_logF LOG 008
recover_replace auto_logF /data/backup/autoLOG_TESTDB.bak 009
recover_start auto_logF LOG 009
recover_cancel
util_release
db_stop
db_start

The output I get is:

>recover_start auto_logF LOG 004
OK
Returncode 0
Date 20050128
Time 00094836
Server u25
Database TESTDB
Kernel Version Kernel 7.5.0 Build 018-123-079-776
Pages Transferred 424
Pages Left 0
Volumes
Medianame auto_logF
Location /data/backup/autoLOG_TESTDB.bak.004
Errortext
Label LOG_000000004
Is Consistent
First LOG Page 2700
Last LOG Page 3517
DB Stamp 1 Date 20050128
DB Stamp 1 Time 00093911
DB Stamp 2 Date 20050128
DB Stamp 2 Time 00093928
Page Count 817
Devices Used 1
Database ID u25:TESTDB_20050128_093836
Max Used Data Page

---
>recover_replace auto_logF /data/backup/autoLOG_TESTDB.bak 005
ERR
-24988,ERR_SQL: sql error
-8888,connection broken server state 10

PS: I cannot use autorecovery because the backup history is incomplete
(SAN snapshots are not registered and there are no previous "backup_start"
full backups).

Can someone tell me what I am doing wrong and what dbmcli commands I shoud
issue to get backup/recover (point-in-time) working using our SAN
snapshot functionality?

Regards,
Jos Weijers


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