Assert failure

Version: Informix 10 We saw following error: 22:18:32 Maximum server connections 489 22:18:56 Logical Log 360070 Complete, timestamp: 0xbdeddf86. 22:19:13 Assert Failed: read_record: decompress_row, source =0xc00000001293901 8, target = 0xc00000001e7ea4a8 22:19:13 IBM Informix Dynamic Server Version 10.00.FC4 22:19:13 Who: Session(70049, azto@dbazto, 11889, c00000001fcc27c8) Thread(71783, sqlexec, c00000001d8655f8, 6) File: rsread.c Line: 2814 22:19:13 Results: Record not read 22:19:13 Action: Please notify IBM Informix Technical Support. 22:19:13 stack trace for pid 1974 written to /store/tmp/af.1c4fd1d0 22:19:13 See Also: /store/tmp/af.1c4fd1d0, shmem.1c4fd1d0.0 22:19:42 read_record: decompress_row, source = 0xc000000012939018,target = 0xc 00000001e7ea4a8 22:19:43 read_record: invalid rowid = 12d01, partnum = 6005b7 22:22:16 Logical Log 360071 Complete, timestamp: 0xbdefe347. 22:22:36 Fuzzy Checkpoint Completed: duration was 2 seconds, 3454buffers not -- then we ran oncheck and saw for one of the tables: BAD PAGE 14:255715: Bad data row - rowid 65537 BAD PAGE 14:255718: Bad data row - rowid 66305 BAD PAGE 14:255721: Bad data row - rowid 67073 BAD PAGE 14:255724: Bad data row - rowid 67841 ERROR: Tablespace 0x6005b7. Page 0x128 appears to be of type "btree", which is out of sync with its bitmap representation (0xc). ERROR: Tablespace 0x6005b7. Page 0x12e appears to be of type "btree", which is out of sync with its bitmap representation (0xc). We also saw: Validating indexes for azto:informix.syscolumns... Index column ERROR: Keys in node 0x30 are not in order. ERROR: Index column for azto:informix.syscolumns is bad. Index col_xtd_id -- 1. Anybody has any suggestions ? I checked various things, but I couldn't anaylse it much myself because I was made aware of this issue late and now all I have it information that I posted in this post. I am not sure why we saw so many errors. 2. I do know that we were running deletes and update stats at that time. Could it have been because of btree thread. We have one btree thread running. 3. Do we need multiple btree threads ? How do we determine the right number.