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IDS Forum

oncheck & BTS index

Posted By: MICHAEL HOFFMAN
Date: Wednesday, 1 April 2015, at 1:25 p.m.

Hi All,
Informix 11.50.FC9 on Sun sparc 10
BTS 2.00
Index size 82598929 (execute function bts_index_info('bts_name_dtl', '<size/>');

Our production server crashed two nights ago. Restarted and all is well.
We are investigating why it crashed, and the evidence points to an issue with a BTS index.

Every night we run 'oncheck -cIy' against all of our databases. When it hits the database with the BTS index, we see a massive hit to Logical Logs (25 Meg each).
The crash happend during this oncheck. There were 75MB available on the sbspace for the index.

We don't do deletes usually, and the following oncheck was run 5 minutes after a previous oncheck, so no real activity on the index in that timeframe.

*** Why would oncheck on a non-busy system cause so much Logical Log usage, and in the case of the crash, so much usage of the sbspace? ***

A normal oncheck (one I just ran) looks like this:
10:58:36 Checkpoint Completed: duration was 0 seconds.
10:58:36 Wed Apr 1 - loguniq 36624, logpos 0x19dc018, timestamp: 0xa561a029 Interval: 545032
10:58:36 Maximum server connections 115
10:58:36 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 254, Llog used 119
11:01:58 Logical Log 36624 Complete, timestamp: 0xa5629376.
11:02:01 Logical Log 36624 - Backup Started
11:02:15 Logical Log 36625 Complete, timestamp: 0xa5640eba.
11:02:23 Logical Log 36624 - Backup Completed
11:02:23 Logical Log 36625 - Backup Started
11:02:31 Logical Log 36626 Complete, timestamp: 0xa5656a20.
11:02:31 Logical Log 36625 - Backup Completed
11:02:31 Logical Log 36626 - Backup Started
11:02:39 Logical Log 36626 - Backup Completed
11:02:46 Logical Log 36627 Complete, timestamp: 0xa566e56c.
11:02:49 Logical Log 36627 - Backup Started
11:02:51 Logical Log 36628 Complete, timestamp: 0xa5685258.
11:02:54 Logical Log 36629 Complete, timestamp: 0xa5699c0b.
11:02:57 Logical Log 36627 - Backup Completed
11:02:57 Logical Log 36628 - Backup Started
11:02:58 Logical Log 36630 Complete, timestamp: 0xa56b2e0b.
11:03:01 Logical Log 36631 Complete, timestamp: 0xa56c9595.
11:03:05 Logical Log 36628 - Backup Completed
11:03:05 Logical Log 36629 - Backup Started
11:03:13 Logical Log 36629 - Backup Completed
11:03:13 Logical Log 36630 - Backup Started
11:03:21 Logical Log 36630 - Backup Completed
11:03:21 Logical Log 36631 - Backup Started
11:03:29 Logical Log 36631 - Backup Completed
11:03:38 Checkpoint Completed: duration was 2 seconds.
11:03:38 Wed Apr 1 - loguniq 36632, logpos 0xa44018, timestamp: 0xa56cd21a Interval: 545033
11:03:38 Maximum server connections 115
11:03:38 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 533, Llog used 96008

When the crash happened, the log registered this:

22:27:16 Logical Log 36517 Complete, timestamp: 0xa4842a4f.
22:27:18 Logical Log 36517 - Backup Started
22:27:24 Logical Log 36518 Complete, timestamp: 0xa485ad82.
22:27:26 Logical Log 36517 - Backup Completed
22:27:26 Logical Log 36518 - Backup Started
22:27:27 Logical Log 36519 Complete, timestamp: 0xa486ef12.
22:27:31 Logical Log 36520 Complete, timestamp: 0xa4888b8e.
22:27:33 Freeing reserve space from chunk 62 to Userdata
22:27:33 WARNING: sbspace bts_sbspace is full
22:27:33 BTS[31110]: BTS DataBlade IO Error detected with BTS DataBlade Index 'informix.bts_name_dtl' in database 'char'
22:27:33 BTS[31110]: The BTS DataBlade Index files were deleted.
22:27:33 BTS[31110]: BTS DataBlade IO Error was probably caused by either an aborted long transaction or
22:27:33 BTS[31110]: no free data or metadata space available in the sbspace for the index
22:27:33 BTS[31110]: Possible Action: drop and recreate the index with enough data and metadata space in the sbspace
22:27:33 Assert Failed: Dynamic Server must abort
22:27:33 IBM Informix Dynamic Server Version 11.50.FC9
22:27:33 Who: Session(31110, root@area51, 3449, 19c4c3790)

Thread(358996, oncheckm, 1970bac40, 1)

File: rslog.c Line: 3640
22:27:33 Results: Dynamic Server must abort
22:27:33 Action: Reinitialize shared memory
22:27:33 stack trace for pid 1706 written to /soft/informix/foghorn/tmp/af.7e3c2234
22:27:33 See Also: /soft/informix/foghorn/tmp/af.7e3c2234, shmem.7e3c2234.0
22:27:34 Logical Log 36518 - Backup Completed
22:27:34 Logical Log 36519 - Backup Started
22:27:42 Logical Log 36519 - Backup Completed
22:27:42 Logical Log 36520 - Backup Started
22:27:59 Logical Log 36520 - Backup Completed
22:29:39 rslog.c, line 3640, thread 358996, proc id 1706, Dynamic Server must abort.
22:29:39 The Master Daemon Died
22:29:39 The Master Daemon Died
22:29:40 Fatal error in ADM VP at mt.c:14033
22:29:40 Unexpected virtual processor termination, pid = 1710, exit = 0x100

Thanks,
Michael Hoffman

Messages In This Thread

  • oncheck & BTS index
    MICHAEL HOFFMAN -- Wednesday, 1 April 2015, at 1:25 p.m.

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