| Bug #1503 | Cannot repair MyISAM table | ||
|---|---|---|---|
| Submitted: | 8 Oct 2003 8:40 | Modified: | 14 Nov 2003 13:08 |
| Reporter: | Martin Mokrejs | Email Updates: | |
| Status: | Closed | Impact on me: | |
| Category: | MySQL Server: MyISAM storage engine | Severity: | S3 (Non-critical) |
| Version: | bk-1.1603 | OS: | Linux (Linux 2.4.19) |
| Assigned to: | Sergei Golubchik | CPU Architecture: | Any |
[8 Oct 2003 8:40]
Martin Mokrejs
[8 Oct 2003 9:26]
Martin Mokrejs
One more old bug not fixed. Freshly fixes table is recognized to have wrong checksum. download http://jerboas.gsf.de/Caenorhabditis_elegans_WS75.tar.gz and repeat commands as below. You should get same results in every step. root@kulan:/data/mysql/test# /usr/local/mysql/bin/myisamchk -dvv contig_data.MYI MyISAM file: contig_data.MYI Record format: Compressed Character set: latin1 (8) File-version: 1 Creation time: 2003-03-18 12:07:56 Recover time: 2003-03-18 12:10:22 Status: crashed Checksum: 0 Data records: 0 Deleted blocks: 0 Datafile parts: 0 Deleted data: 0 Datafile pointer (bytes): 4 Keyfile pointer (bytes): 4 Datafile length: 53 Keyfile length: 1024 Max datafile length: 4294967294 Max keyfile length: 4398046510079 Recordlength: 5691679 table description: Key Start Len Index Type Rec/key Root Blocksize 1 2 4 unique long 0 1024 2 6 4 multip. long 0 1024 3 10 100 multip. char packed stripped 0 1024 4 110 100 multip. char packed stripped 0 1024 5 210 255 multip. char packed stripped NULL 0 2048 Field Start Length Nullpos Nullbit Type Huff tree Bits 1 1 1 1 9 2 2 4 no zeros, zerofill(3) 1 9 3 6 4 no zeros, zerofill(3) 1 9 4 10 100 no endspace 1 9 5 110 100 no endspace 1 9 6 210 255 1 1 no endspace 1 9 7 465 12 1 2 blob 1 9 8 477 100 no endspace, no empty 1 9 root@kulan:/data/mysql/test# cp contig_data.MYD contig_data.MYD- root@kulan:/data/mysql/test# ls -la total 26752 drwx------ 2 mysql mysql 4096 Oct 8 17:44 . drwx------ 463 mysql mysql 16384 Oct 7 19:22 .. -rw-rw---- 1 mysql mysql 0 Oct 8 17:44 contig_data.MYD -rw-r----- 1 root root 27303889 Oct 8 17:44 contig_data.MYD- -rw-rw---- 1 mysql mysql 1024 Oct 8 17:44 contig_data.MYI -rw-rw---- 1 mysql mysql 8744 Oct 8 17:43 contig_data.frm -rw-rw---- 1 mysql mysql 20 Oct 7 19:04 testac.MYD -rw-rw---- 1 mysql mysql 1024 Oct 7 19:11 testac.MYI -rw-rw---- 1 mysql mysql 8604 Oct 7 19:04 testac.frm root@kulan:/data/mysql/test# /usr/local/mysql/bin/myisampack contig_data.MYI Compressing contig_data.MYD: (0 records) - Calculating statistics - Compressing file Empty file saved in compressed format Remember to run myisamchk -rq on compressed tables root@kulan:/data/mysql/test# cp contig_data.MYD- contig_data.MYD root@kulan:/data/mysql/test# /usr/local/mysql/bin/myisamchk -rq contig_data.MYI - check key delete-chain - check record delete-chain - recovering (with keycache) MyISAM-table 'contig_data.MYI' Data records: 0 Found wrong record at 12017949 MyISAM-table 'contig_data.MYI' is not fixed because of errors Try fixing it by using the --safe-recover (-o) or the --force (-f) option root@kulan:/data/mysql/test# /usr/local/mysql/bin/myisamchk -r contig_data.MYI - recovering (with sort) MyISAM-table 'contig_data.MYI' Data records: 3 - Fixing index 1 Found wrong record at 12017949 - Fixing index 2 - Fixing index 3 - Fixing index 4 - Fixing index 5 root@kulan:/data/mysql/test# root@kulan:/data/mysql/test# /usr/local/mysql/bin/myisamchk -dvv contig_data.MYI MyISAM file: contig_data.MYI Record format: Compressed Character set: latin1 (8) File-version: 1 Creation time: 2003-10-08 17:44:37 Recover time: 2003-10-08 18:22:47 Status: checked,optimized keys Checksum: 0 Data records: 3 Deleted blocks: 0 Datafile parts: 3 Deleted data: 0 Datafile pointer (bytes): 4 Keyfile pointer (bytes): 4 Datafile length: 12017949 Keyfile length: 7168 Max datafile length: 4294967294 Max keyfile length: 4398046510079 Recordlength: 5691679 table description: Key Start Len Index Type Rec/key Root Blocksize 1 2 4 unique long 0 1024 1024 2 6 4 multip. long 0 2048 1024 3 10 100 multip. char packed stripped 0 3072 1024 4 110 100 multip. char packed stripped 0 4096 1024 5 210 255 multip. char packed stripped NULL 0 5120 2048 Field Start Length Nullpos Nullbit Type Huff tree Bits 1 1 1 1 9 2 2 4 no zeros, zerofill(3) 1 9 3 6 4 no zeros, zerofill(3) 1 9 4 10 100 no endspace 1 9 5 110 100 no endspace 1 9 6 210 255 1 1 no endspace 1 9 7 465 12 1 2 blob 1 9 8 477 100 no endspace, no empty 1 9 root@kulan:/data/mysql/test# /usr/local/mysql/bin/myisamchk contig_data.MYI Checking MyISAM file: contig_data.MYI Data records: 3 Deleted blocks: 0 - check file-size - check key delete-chain - check record delete-chain - check index reference - check data record references index: 1 - check data record references index: 2 - check data record references index: 3 - check data record references index: 4 - check data record references index: 5 - check record links myisamchk: warning: Record checksum is not the same as checksum stored in the index file MyISAM-table 'contig_data.MYI' is usable but should be fixed root@kulan:/data/mysql/test#
[12 Oct 2003 10:43]
Sergei Golubchik
One question - changeset 1.1603 in what tree ? 4.0 or 4.1 ?
[17 Oct 2003 8:17]
Martin Mokrejs
4.0 tree.
[14 Nov 2003 13:08]
Sergei Golubchik
It's not really a bug. myisamchk does not update table's checksum automatically. You need to use --correct-checksum switch for this (in repair mode, that is with -r or -o). But I fixed myisamchk (in 4.0.17) to always imply this flag for compressed tables.
