Purposely Corrupting a table
Ok, been googling all morning, and keep getting the same post (on multiple different sites). Is there a way, where i corrupt a table purposely? I've tried playing with the .MYD file, and yeah, it marks it deleted under the check routine, but the table is still readable/writable, just doesn't have any info when selecting it... is there another way to corrupt the table, where you can't even select from it, or the responce back from a select is an error? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Purposely Corrupting a table
Hi, Keep key_buffer_size very low and insert lots of data into table (myisam). After some time the index file will crash. Krishna CGI.COM On Tue, Oct 19, 2010 at 7:53 PM, Steve Staples sstap...@mnsi.net wrote: Ok, been googling all morning, and keep getting the same post (on multiple different sites). Is there a way, where i corrupt a table purposely? I've tried playing with the .MYD file, and yeah, it marks it deleted under the check routine, but the table is still readable/writable, just doesn't have any info when selecting it... is there another way to corrupt the table, where you can't even select from it, or the responce back from a select is an error? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=prajapat...@gmail.com
Re: Purposely Corrupting a table
It's easy to corrupt the MYISAM index (MYI) file... I do something like this in linux -- assuming your table is not tiny, and mysql isn't running or you have a lock on the table: dd if=table.MYI of=table2.MYI bs=2048 count=100 then copy table2.MYI over table.MYI and then flush tables and then unlock. Your table will be unreadable until you rebuild the index with REPAIR TABLE or myisamchk. The MYD file will remain intact. If your MYI file is smaller than 200k, then just reduce the count=#. -Hank On Tue, Oct 19, 2010 at 7:53 PM, Steve Staples sstap...@mnsi.net wrote: Ok, been googling all morning, and keep getting the same post (on multiple different sites). Is there a way, where i corrupt a table purposely? I've tried playing with the .MYD file, and yeah, it marks it deleted under the check routine, but the table is still readable/writable, just doesn't have any info when selecting it... is there another way to corrupt the table, where you can't even select from it, or the responce back from a select is an error? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Purposely Corrupting a table
I'll tell a much easier way to corrupt table. Open the data or index file, remove some text data in the file and save. It will show it a corrupt. ( Only for test setups ). On Tue, Oct 19, 2010 at 10:11 PM, Hank hes...@gmail.com wrote: It's easy to corrupt the MYISAM index (MYI) file... I do something like this in linux -- assuming your table is not tiny, and mysql isn't running or you have a lock on the table: dd if=table.MYI of=table2.MYI bs=2048 count=100 then copy table2.MYI over table.MYI and then flush tables and then unlock. Your table will be unreadable until you rebuild the index with REPAIR TABLE or myisamchk. The MYD file will remain intact. If your MYI file is smaller than 200k, then just reduce the count=#. -Hank On Tue, Oct 19, 2010 at 7:53 PM, Steve Staples sstap...@mnsi.net wrote: Ok, been googling all morning, and keep getting the same post (on multiple different sites). Is there a way, where i corrupt a table purposely? I've tried playing with the .MYD file, and yeah, it marks it deleted under the check routine, but the table is still readable/writable, just doesn't have any info when selecting it... is there another way to corrupt the table, where you can't even select from it, or the responce back from a select is an error? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=sureshkumar...@gmail.com -- Thanks Suresh Kuna MySQL DBA
