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Problem IT29006
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Status: Closed |
AN OLD NON-BIG CHUNK MADE EXTENSIBLE CAN GROW HUGE WITHOUT SWITCHING TO BIG-CHUNK MODE, CAUSING PAGE HEADER CORRUPTIONS
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| product: |
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10 |
| Problem description: |
A chunk inherited from a a pre-v10.00 life of an instance is
allowed to be made extentable and then can grow without limit.
If this chunk never had been turned into a 'big' chunk, it will
remain non-big even though growing way beyond the 1mio
(1024*1024) pages limit supported by non-big chunk page headers.
E.g.:
IBM Informix Dynamic Server Version 12.10.FC11 -- On-Line -- Up
00:20:59 -- 56208 Kbytes
Dbspaces
address number flags fchunk nchunks pgsize
flags owner name
700000020358028 1 0x20001 1 1 4096
N A informix rootdbs
70000002047cc28 2 0x20001 2 1 4096
N A informix datadbs
2 active, 2047 maximum
Chunks
address chunk/dbs offset size free
bpages flags pathname
700000020358268 1 1 0 75000 63273
PO---D /chunks/rootchunk
7000000503b0028 2 2 0 2499287 0
PO--ED /chunks/datachunk
2 active, 2047 maximum
Typically all index and data pages continue to function and be
usable normally (even though carrying bad page addresses. Where
the problem surfaces typially is with bfcheck assersions on
'chunk free list' pages (should carry flag 8, but turn out to
have different flags - in reallity that's not even true, only
such page might be read from wrong location.)
The real danger of this problem will arise with a restore of
such dbspace. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Users of IDS prior to 12.10.xC13. *
****************************************************************
* PROBLEM DESCRIPTION: *
* An old non-big chunk made extensible can grow huge without *
* switching to big-chunk mode causing page header corruptions. *
****************************************************************
* RECOMMENDATION: *
**************************************************************** |
| Local Fix: |
Need to unload an affected space, the drop / recreate and
re-load it. |
| Solution |
|
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 02.05.2019
03.10.2019
03.10.2019 |
| Problem solved at the following versions (IBM BugInfos) |
12.10.xC13
|
| Problem solved according to the fixlist(s) of the following version(s) |
