does the table ur trying to delete has any primary-foreign key relation. do "show create table table_name\G"
Also instead of delete, use truncate, i t will be faster. regards anandkl On Tue, Nov 10, 2009 at 3:19 AM, Sebastiaan van Erk <sebs...@sebster.com>wrote: > Hi, > > I followed the instructions but still get: > > mysql> delete from mytable; > > ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key > constraint fails (temp file operation failed) > mysql> > > Regards, > Sebastiaan > > > Krishna Chandra Prajapati wrote: > >> Hi Sebastiaan, >> >> Steps to fix the issue. >> 1. Do proper shutdown of mysql server. >> 2. Check the error log file that mysql server is shutdown properly. >> 3. Remove log files (ib_logfile0 and ib_logfile1). >> 4. Start mysql server (The log files will be created automatically) >> >> Thanks, >> Krishna >> >> On Sun, Nov 8, 2009 at 2:51 PM, Sebastiaan van Erk >> <sebs...@sebster.com<mailto: >> sebs...@sebster.com>> wrote: >> >> Hi all, >> >> I just recently upgraded to Ubuntu 9.10, but now I'm having all >> sorts of temp file problems. For example, when I try to delete a row >> and violate a contraint I get: >> >> ERROR 1451 (23000): Cannot delete or update a parent row: a foreign >> key constraint fails (temp file operation failed) >> >> Instead of telling me which constraint is violated, it tells me the >> temp file creation failed. I have no reason why it failed, I don't >> see any error messages in the log. >> >> To solve this problem I tried to make a tmpfs partition (I thought, >> maybe somehow my using ext4 might be a problem): >> >> mkdir /tmpfs >> mount -t tmpfs -o size=1g tmpfs /tmpfs >> mkdir /tmpfs/mysql >> chown mysql:mysql >> >> and changed the tmpdir in the mysql config to /tmpfs/mysql >> >> tmpdir=/tmpfs/mysql >> >> But then mysql fails on startup: >> >> /usr/sbin/mysqld: Can't create/write to file '/tmpfs/mysql/ibGgjPv7' >> (Errcode: 13) >> 091108 10:12:46 InnoDB: Error: unable to create temporary file; >> errno: 13 >> 091108 10:12:46 [ERROR] Plugin 'InnoDB' init function returned error. >> 091108 10:12:46 [ERROR] Plugin 'InnoDB' registration as a STORAGE >> ENGINE failed. >> >> I checked error code 13, which is permission denied, but I don't >> understand this, because if I change tmpdir to /tmp/mysql it does >> work, and I have: >> >> $ ls -ld /tmp/mysql >> drwxr-xr-x 2 mysql mysql 4096 2009-11-08 10:14 /tmp/mysql >> >> $ ls -ld /tmpfs/mysql >> drwxr-xr-x 2 mysql mysql 40 2009-11-08 10:12 /tmpfs/mysql >> >> So I don't see the difference.... >> >> Has anyone encountered similar problems, or know what's going on here? >> >> Best regards, >> Sebastiaan >> >> >>
