IMServer:MongoDB

MongoDB

• 64 bit recommended due to 2gb data size barrier in 32bit
• 1.7.4 has some enhancements like 16mb limit per binary record
• Binary can be downloaded from
• On deployment server, needs a script to be installed in init.d to stop / restart / start mongodb

Creating indexes

<source lang="python">

import pymongo

1. connect with the database

try: conn = pymongo.Connection() db = conn['clay1'] print 'Connection OK' except: print 'Cound not Connect ..'

1. loop through all collections

cols = db.collection_names()

for col_name in cols: # skip if starts with system if col_name[0:6] <> 'system': print 'Opening collection : ' + col_name col = db[col_name] print ' With %d records'%(col.count()) print ' ' + str(col.index_information()) print ' Creating index ...' col.ensure_index("name") print "\r Done ... " </source>

Cookbook

How to find if a collection exists

Also it helps if mongo can be queried for existing collections first. That can be done by querying system.namespaces collection in that database, which lists all the collections

<source lang="javascript"> show dbs use clay1 db.system.namespaces.find({ "name" :"clay1.n5"}) </source>

"clay1" is the name of the database, and "n5" is the name of the collection to find