Database crash --- help

[geobg]

I finished creating a 10GB oracle 8.1.7 database on a 64 bit IBM AIX platform. I was forced to lacate the datafiles on an EMC IP4700 box (hybrid ofg EMC Symmetrix and Clariion).
The details of the databse is as follows:

Total System Global Area 1183438972 bytes
Fixed Size 116860 bytes
Variable Size 109408256 bytes
Database Buffers 1073741824 bytes
Redo Buffers 172032 bytes

db_block_buffers = 131072
shared_pool_size = 52428800
large_pool_size = 614400
java_pool_size = 20971520
log_checkpoint_interval = 10000
log_checkpoint_timeout = 1800
processes = 200
log_buffer = 163840
compatible = "8.1.0"
# sort_area_size = 65536
sort_area_size = 131072
sort_area_retained_size = 65536


redolog files werte sized at 1MB each.

Everything went fine for one week. I was then importing a 4.5 GB table and I suddenly got the first error

"This memory-realm does not exist".
End of communication channel
Oracle not available.

I had to reboot the server and the database could only be mounted. Could not open as it says there is corruption in one fo the redologs. :
*** SESSION ID:(4.1) 2001-03-21 17:26:59.254
***
Corrupt block relative dba: 0x00000001 (file 0, block 1)
Bad check value found during control file header read
Data in bad block -
type: 21 format: 2 rdba: 0x00000001
last change scn: 0xffff.00006166 seq: 0x1 flg: 0x04
consistency value in tail: 0x61661501
check value in block header: 0xe949, computed block checksum: 0xe083
spare1: 0x0, spare2: 0x0, spare3: 0x0
***
***
What could be the problem ???
Please help. I just created the database and did not get time to take bachkup measures.

Thanks in advance,


Geo.

[Halo]

Check the alert log and any trace files for further info. Seems like a block corruption. I would advise you to call Tech Support. Increase the size of the redo log files. 1M is way too small, esp for imports.

[pando]

increase your log_buffer as well
Check the alert log but I guess it didnt shutdown cleanly, if soyou better call support if it was cleanly shutdown try drop the corrupt redolog in mount state

[geobg]

Thanks for the advise.
But could you please suggest a better sizing for the reodlogs and logbuffers ?
Is a redolog of size 5M okay. I will be doing lot of large file import, extraction and exports. also, I intend to cahce a feew tables. I have 8GB of memory at my disposal. So theoritically I can use 4GB of Memory for oracle.

please advise.

Thanks,

Geo

[pando]

is it OLTP or dwh?
I usually use 3MB log buffer
whereas file size you have to monitor how often is your database switching the logs, should around 30 minutes for each log switch

[geobg]

Thanks for the update.
I was checking the alertlog.

I saw a lot of checkpoint not complete errors.
In the alertlog, it said, instance terminated by CKPT due to erro 1110

it seems I may have torebuild the database.

But I woul like to truobleshoot this and find the cause.

Thanks in advance,
Geo

[LND]

Read thread on metalink about this issue:
From: John Orsini 22-Jan-01 13:14
Subject: Corrupt block relative dba

Looks like you can temporary escape the problem by removing corrupt control file, but otherwise it seems to be hw/sw issue.