These options are used to specify the location of the respective files.
If you do not set them they go to your datadir e.g. /var/lib/mysql
 
http://www.mysql.com/doc/en/Replication_Options.html
 

relay-log=filename 
To specify the location and name that should be used for relay logs. You
can use this to have hostname-independant relay log names, or if your
relay logs tend to be big (and you don't want to decrease
max_relay_log_size) and you need to put them on some area different from
the data directory, or if you want to increase speed by balancing load
between disks. 

relay-log-index=filename 
To specify the location and name that should be used for the relay logs
index file
 
 
- Dathan Vance Pattishall
  - Sr. Programmer and mySQL DBA for FriendFinder Inc.
  - http://friendfinder.com/go/p40688
 
 
-->-----Original Message-----
-->From: Hsiu-Hui Tseng [mailto:[EMAIL PROTECTED]
-->Sent: Thursday, September 25, 2003 11:28 AM
-->To: [EMAIL PROTECTED]
-->Subject: replication setting
-->
-->Hi,
-->
-->I have question on replication setting in my.cnf
-->
-->what is the difference between relay-log and relay-log-index? If I do
not
-->set them, what will happen?
-->
-->thanks
-->
-->Hsiu-Hui
-->
-->
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