10-14-2008
I think there are two approaches to do this.
Approach I
To write a complex, costly query that fetches data from multiple db compares and gives the output that is needed - everything in the form of query or to use a stored procedure to do this work. To some extent, after-query processing of data might be needed if everything cannot be achieved via querying from databases ( assuming you are not going for the option of stored procedures). But queries fetching data from multiple dbs don't come for free.
Approach II
Download the required data from each of the db/table and then use a perl/shell script to achieve the same.
The approaches need to be decided purely based on the importance of the application that you are writing. If the databases that are going to be queried are heavily loaded already, then its not worthwhile to use the approach I.
Approach I may not be more suited if the application is like reporting or batch processing that don't have strict timelines ( most of the time ) then its better to switch to approach II.
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LEARN ABOUT CENTOS
radsqlrelay
RADSQLRELAY(8) FreeRADIUS helper program RADSQLRELAY(8)
NAME
radsqlrelay - relay SQL queries to a central database server
SYNOPSIS
radsqlrelay [-?] [-d sql_driver] [-b database] [-f file] [-h host] [-u user] [-P port] [-p password] [-1] [-x] file_path
DESCRIPTION
radsqlrelay tails a SQL logfile and forwards the queries to a database server. Used to replicate accounting records to one (central) data-
base, even if the database has extended downtime.
The SQL logfile is created by the rlm_sql_log module. The module must be configured in the radiusd server before you can use radsqlrelay.
OPTIONS
-? Print usage help information.
-d sql_driver
Driver to use: mysql, pg, oracle.
-b database
Name of the database to use.
-f file
Read password from file, instead of command line.
-h host
Connect to host.
-u user
User for login.
-P port
Port number to use for connection.
-p password
Password to use when connecting to server.
-1 One-shot mode: push the file to database and exit.
-x Turn on debugging.
file_path
The pathname of the SQL logfile to use.
NOTES
Oracle driver
The command "radsqlrelay -d oracle -b db.domain.tld sql-relay" reads the database description stored in $TNS_ADMIN/tnsnames.ora:
db.domain.tld =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = db.domain.tld)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = <DB SID>)
)
)
SEE ALSO
rlm_sql_log(5)
AUTHOR
Nicolas Baradakis <nicolas.baradakis@cegetel.net>
19 June 2005 RADSQLRELAY(8)