Mysql Error Not Enough Memory For Blob At
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Email Updates: Status: Closed Impact on me: None Category:MySQL Server: MyISAM storage engine Severity:S2 (Serious) Version: OS:Linux (Suse/Windows XP) Assigned to: Michael Widenius View Add Comment Files Developer Edit Submission View Progress Log Contributions [18 Nov 2003 5:29] Miguel Solorzano Description: myisamchk presents the below error when trying to fix a table with blob columns: miguel@hegel:~/test> /home/miguel/mysql-4.0/myisam/myisamchk -r https://www.experts-exchange.com/questions/24150163/MySQL-table-keeps-crashing-not-enough-memory-for-blob.html home/miguel/test/*.MYI - recovering (with sort) MyISAM-table '/home/miguel/test/testrun.MYI' Data records: 43968 - Fixing index 1 Wrong block with wrong total length starting at 76758748 myisamchk: error: Not enough memory for blob at 76758800 MyISAM-table '/home/miguel/test/testrun.MYI' is not fixed because of errors How to repeat: Sergei: The file you should https://bugs.mysql.com/bug.php?id=1869 get at our irc:/tmp directory. Suggested fix: I don't know :) [18 Nov 2003 6:16] Miguel Solorzano I forget for to add Windows OS. [19 Nov 2003 4:56] Alexander Keremidarski With same test files myisamchk from 4.1 crashes with Segmentation fault no matter what options it is stared with: It always fails with following backtrace: (gdb) bt #0 0x40036a7e in pthread_mutex_lock () from /lib/tls/libpthread.so.0 #1 0x0809be7e in safe_mutex_lock (mp=0x5c, file=0x80b1fbf "mf_keycache.c", line=2056) at thr_mutex.c:95 #2 0x0808c7f3 in flush_key_blocks (keycache=0x0, file=6, type=FLUSH_FORCE_WRITE) at mf_keycache.c:2056 #3 0x0806d467 in chk_size (param=0x8167040, info=0x816a3b0) at mi_check.c:275 #4 0x08051eb1 in myisamchk (param=0x8167040, filename=0xbffff832 "testrun") at myisamchk.c:1017 #5 0x08050a29 in main (argc=0, argv=0x81694d8) at myisamchk.c:106 [19 Nov 2003 23:35] Sergei Golubchik here there are two unrelated issues: 1. myisamchk reports "Not enough memory" - there is nothing we can fix here. It's true that 1G blob that myisa
06, Mike Brickman wrote: > Hi, > > I have a client who has managed to corrupt an MYD table so that it can > not be repaired. I have tried: > > Myisamchk https://lists.mysql.com/mysql/157016 -re {table} > > And this crashes out with: > > myisamchk: error: Not enough memory for blob at 3960 (need 1090519040) > > and then quits. > > There is no http://grokbase.com/t/mysql/mysql/0416e7fmzj/corrupt-myd-table-can-not-repair complete backup of this file so I would like to recover as > much data as possible. > > 4) What exactly does the error mean? It means that myisamchk tries to mysql error allocate 1090519040 bytes to read a blob of this size - and malloc() fails. > 3) Are the internal structures of MYD files documented anywhere > (url please)? To my knowledge - no. > 2) Why does myisamchk not fix the problem? Because the problem is "Out Of Memory" error - this isn't something myisamchk can fix :) What happens is, myisamchk finds a mysql error not something that looks like row header, but in fact it is part of your data. Interpreting this row header myisamchk thinks it belongs to a 1Gb blob. It's unavoidable - when you ask to recover "as much as possible", myisamchk does it, literally, and you may get spurious rows in the result. The negative effect is that spurious row header can abort the repair process. To fix it, in 4.1.1 we added a new command-line option to myisamchk: --max-record-length. If you happen to know that no row in your table is longer than N, you may tell myisamchk that all rows longer than that are false matches and should be ignored. > 1) Are there any tools which will allow me to salvage some data? myisamchk as of 4.1.1. Regards, Sergei -- __ ___ ___ ____ __ / |/ /_ __/ __/ __ \/ / Sergei Golubchik
so that it cannot be repaired. I have tried:Myisamchk -re {table}And this crashes out with:myisamchk: error: Not enough memory for blob at 3960 (need 1090519040)and then quits.There is no complete backup of this file so I would like to recover asmuch data as possible.1) Are there any tools which will allow me to salvage some data?2) Why does myisamchk not fix the problem?3) Are the internal structures of MYD files documented anywhere(url please)?4) What exactly does the error mean?Any help or clues will be appreciated.Mike BrickmanRadical Solutions reply Tweet Search Discussions Search All Groups mysql 3 responses Oldest Nested Miguel solorzano At 19:04 6/1/2004 +0000, Mike Brickman wrote: If you are able for to build myisamchk from the 4.1 bk tree it will permit you to set a max row length for to skip them and continue the recovery. -- Regards, For technical support contracts, visit https://order.mysql.com/ Are you MySQL certified?, http://www.mysql.com/certification/ Miguel Angel Solórzano < [email protected] > São Paulo - Brazil Miguel solorzano at Jan 6, 2004 at 7:13 pm ⇧ At 19:04 6/1/2004 +0000, Mike Brickman wrote:If you are able for to build myisamchk from the 4.1 bk treeit will permit you to set a max row length for to skip themand continue the recovery.Hi,I have a client who has managed to corrupt an MYD table so that it cannot be repaired. I have tried:Myisamchk -re {table}And this crashes out with:myisamchk: error: Not enough memory for blob at 3960 (need 1090519040)and then quits.There is no complete backup of this file so I would like to recover asmuch data as possible.1) Are there any tools which will allow me to salvage some data?2) Why does myisamchk not fix the problem?3) Are the internal structures of MYD files documented anywhere(url please)?4) What exactly does the error mean?Any help or clues will be appreciated.Mike BrickmanRadical Solutions--Regards,For technical support contracts, visit https://order.mysql.com/Are you MySQL certified?, http://www.mysql.com/certification/Miguel Angel Solórzano