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Mongo shell startup configuration file .mongorc.js (3)

Custom MongoDB operation function

You can save your own js code somewhere, have MongoDB load it, and then manipulate it on the command line of MongoDB.

Mongodb shell loads the ~ / .mongorc.js file by default.

For example, the following changes are made to the startup prompt text and the left prompt text, and the my_show_shards shell function is added to display the load of the current sharded collection chunks in each shard:

/ / ~ / .mongorc.js / / show at begin var compliment = ["attractive", "intelligent", "like batman"]; var index = Math.floor (Math.random () * 3); print ("Hello, you're looking particularly" + compliment [index] + "today!"); / / change the prompt prompt = function () {if (typeof db = "undefined") {return "(nodb) >" } / / Check the last db operation try {db.runCommand ({getLastError: 1);} catch (e) {print (e);} return db + ">";} / / show all shard's chunks function my_show_shards () {var config_db = db.getSiblingDB ("config"); var collections = {} Var shards = {}; var shard_it = config_db.chunks.find (). Snapshot (); while (shard_it.hasNext ()) {next_item = shard_it.next (); collections [JSON.stringify (next_item ["ns"]). Replace (/\ "/ g,")] = 1 Shards [JSON.stringify (next_item ["shard"]). Replace (/\ "/ g,")] = 1;} var list_collections = []; var list_shards = []; for (item in collections) {list_collections.push (item);} for (item in shards) {list_shards.push (item) } list_collections.forEach (function (collec) {list_shards.forEach (function (item) {obj = {}; obj ["shard"] = item; obj ["ns"] = collec; it = config_db.chunks.find (obj) Print (collec, item, it.count ();})})}

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