on mysql 4.0.10-gamma (rpm install, Redhat advanced server), I 
am running into 'too many open files' issues ( error 24 ).

  I am using a rather large merge table (30 distinct tables merged),
which is likely the culprit. The error shows up as I have about a
dozen of connections.

  I did increase the number of file handles substantionally (16384)
and it looks like this limit is not reached:

cat /proc/sys/fs/file-nr  
5328    4758    16384

  This is a 2.4 kernel, so inodes are allocated automatically and
there is no inode-max setting.

  'open_files_limit' is set to 0.
  'table_cache' is set to 1024

   cmd line used to run mysqld:

/bin/sh /usr/bin/mysqld_safe --log-slow-queries --datadir=/var/lib/mysql 
--pid-file=/var/lib/mysql/x440.pid
...
/usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql 
--user=mysql--pid-file=/var/lib/mysql/x440.pid --skip-locking--log-slow-queries

   in other words: I checked ulimit...

   What am I missing?

hardware: dual Xeon system, 8 GByte RAM


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