dungmanh88
/ backup_collection_mongo.sh
Last active
January 22, 2024 07:42
Dump multiple collections of a db in mongodb
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| #!/bin/bash | |
| db=<db> | |
| collection_list="<collection1> <collection2> <collection3>" | |
| host=127.0.0.1 | |
| port=<port> | |
| out_prefix=/Temp | |
| for collection in $collection_list; do | |
| echo $collection | |
| out_dir="${out_prefix}/${db}_${collection}/" |
eranation
/ gist:3241616
Created
August 2, 2012 22:51
MongoDB Aggregation Framework way for "select count (distinct fieldName) from someTable" for large collections
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| //equivalent of "select count (distinct fieldName) from someTable" | |
| db.someCollection.aggregate([{ $group: { _id: "$fieldName"} },{ $group: { _id: 1, count: { $sum: 1 } } } ]) |