How to run queries on live data
From Wikitech
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# Connect to the master database server with the syntax 'sql <DBNAME>', for example 'sql enwiki' | # Connect to the master database server with the syntax 'sql <DBNAME>', for example 'sql enwiki' | ||
# Run your query | # Run your query | ||
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Revision as of 13:30, 21 October 2012
If you need to query the live data (rather than a dump or toolserver mirror), follow the following steps:
- Go to http://noc.wikimedia.org/dbtree/ and look for a slave database server that isn't very busy (low lag, few active threads and slow queries) and has the data you need (See https://noc.wikimedia.org/conf/highlight.php?file=db.php)
- ssh to fenari
- Connect to the slave database server with the syntax 'sql <DBNAME> -h <HOSTNAME>', for example 'sql enwiki -h db1001'
- Run your query
You should avoid running queries on the master databases whenever possible. Otherwise you will bog down performance of the live websites. If you absolutely must run a query on a master database, follow the following instructions:
- ssh to fenari
- Connect to the master database server with the syntax 'sql <DBNAME>', for example 'sql enwiki'
- Run your query
