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// Confirms that the dbStats command returns expected content.
//
// @tags: [requires_dbstats]
(function() {
"use strict";
function serverIsMongos() {
const res = db.runCommand("ismaster");
assert.commandWorked(res);
return res.msg === "isdbgrid";
}
function serverUsingPersistentStorage() {
const res = db.runCommand("serverStatus");
assert.commandWorked(res);
return res.storageEngine.persistent === true;
}
const isMongoS = serverIsMongos();
const isUsingPersistentStorage = !isMongoS && serverUsingPersistentStorage();
let testDB = db.getSiblingDB("dbstats_js");
assert.commandWorked(testDB.dropDatabase());
let coll = testDB["testColl"];
assert.commandWorked(coll.createIndex({x: 1}));
const doc = {
_id: 1,
x: 1
};
assert.writeOK(coll.insert(doc));
let dbStats = testDB.runCommand({dbStats: 1});
assert.commandWorked(dbStats);
assert.eq(1, dbStats.objects, tojson(dbStats)); // Includes testColl only
const dataSize = Object.bsonsize(doc);
assert.eq(dataSize, dbStats.avgObjSize, tojson(dbStats));
assert.eq(dataSize, dbStats.dataSize, tojson(dbStats));
// Index count will vary on mongoS if an additional index is needed to support sharding.
if (isMongoS) {
assert(dbStats.hasOwnProperty("indexes"), tojson(dbStats));
} else {
assert.eq(2, dbStats.indexes, tojson(dbStats));
}
assert(dbStats.hasOwnProperty("storageSize"), tojson(dbStats));
assert(dbStats.hasOwnProperty("numExtents"), tojson(dbStats));
assert(dbStats.hasOwnProperty("indexSize"), tojson(dbStats));
if (isUsingPersistentStorage) {
assert(dbStats.hasOwnProperty("fsUsedSize"), tojson(dbStats));
assert(dbStats.hasOwnProperty("fsTotalSize"), tojson(dbStats));
}
// Confirm collection and view counts on mongoD
if (!isMongoS) {
assert.eq(testDB.getName(), dbStats.db, tojson(dbStats));
// We wait to add a view until this point as it allows more exact testing of avgObjSize for
// WiredTiger above. Having more than 1 document would require floating point comparison.
assert.commandWorked(testDB.createView("testView", "testColl", []));
dbStats = testDB.runCommand({dbStats: 1});
assert.commandWorked(dbStats);
assert.eq(2, dbStats.collections, tojson(dbStats)); // testColl + system.views
assert.eq(1, dbStats.views, tojson(dbStats));
}
})();
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