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2878588 - What to do in case of database corruption - SAP IQ

Symptom

*** To SAP Customers: Open an incident and wait for SAP Procuduct Support's instructions ***
*** To SAP Procuduct Support engineers: Consult IQ engineering before proceeding to any of the steps outlined in this KBA ***

 

If "Incorrect page header read" errors or "Decompression error during read" are seen in IQMSG, then one or several database corruptions have occurred.

Examples:

main Bufman: Incorrect page header read; from slib/s_trycatch.cxx:3033 into buffer 0x7f39dbc87160
expected: btype=14,pbn=2255438998,txn=318030875,sp=6,nlb=16,npb=16,iscmp=0,uid=202237502,blk=2255438998,mn=1519,upmn=1519,flgs=0x80000008
head: btype=12,pbn=2211438900,txn=316265476,sp=32,nlb=16,npb=13,iscmp=1,ctr=136,cta=134,ver=1,pb=79,pus=35194
buffer: 0x0c0010000d00888696446f860000000004d4d9120000000020000000014f7a89
Expected Pad1: 150 (0x96), Pad2: 58942 (0xe63e)
Got Pad1: 79 (0x4f), Pad2: 35194 (0x897a)

main Bufman: Decompression error during Read; from slib/s_buf.cxx:1801 into buffer 0x7f39cca8abf0
expected: btype=7,pbn=1796053477,txn=318017859,sp=7,nlb=16,npb=12,iscmp=1,uid=168301663,blk=134,mn=503,upmn=503,flgs=0x80000018
head: btype=7,pbn=1796053455,txn=317373933,sp=9,nlb=16,npb=12,iscmp=1,ctr=136,cta=134,ver=1,pb=95,pus=134
buffer: 0x070010000c008886e5990d6b00000000edbdea120000000009000000015f8600
Expected Pad1: 95 (0x5f), Pad2: 134 (0x0086)
Got Pad1: 95 (0x5f), Pad2: 134 (0x0086)

A stack trace could also be printed (not always) with or without the SQL statement accessing data with those block numbers.


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Environment

SAP IQ 16.x

Keywords

"Incorrect page header read",  IPHR,  "blocks with multiple owners" , "unallocated blocks in use", multiple, owners, unallocated, blocks, corrupt, sp_iqcheckdb, allocation, CORE_Options157, CORE_Options158 , KBA , BC-SYB-IQ , Sybase IQ , Problem

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