mhelmstetter

db.adminCommand({'listDatabases':1, nameOnly:true}).databases.forEach(function(mydb) {
    var dbName = mydb.name;
    if (! ["admin", "config", "local"].includes(dbName)) {
        var currentDB = db.getSiblingDB(dbName);
        var collectionNames = currentDB.getCollectionNames();
        collectionNames.forEach(function (collName) {
            if (/^system\./.test(collName)){
              return;
            }
            var indexes = currentDB[collName].getIndexes();

mhelmstetter

/* global db, tojson, tojsononeline, rs, print, printjson */

/* =================================================
 * getMongoData.js: MongoDB Config and Schema Report
 * =================================================
 *
 * Copyright MongoDB, Inc, 2015
 *
 * Gather MongoDB configuration and schema information.
 *

mhelmstetter

db.adminCommand( { listDatabases: 1 } ).databases.forEach(function (dbObj) {
	var stats = db.getSiblingDB(dbObj["name"]).stats();
	if (stats.objects == 0) {
		print(dbObj["name"]);
	}
});

mhelmstetter

var dbCount = 0;
var collCount = 0;
var dataSize = 0;
var storageSize = 0;
var indexSize = 0;
db.adminCommand( { listDatabases: 1 } ).databases.forEach(function (dbObj) {
	var stats = db.getSiblingDB(dbObj["name"]).stats(1024*1024*1024);
	dbCount++;
	collCount += stats.collections;
	dataSize += stats.dataSize;

mhelmstetter

 mongo --quiet  --eval 'db.adminCommand( { listDatabases: 1 } ).databases.forEach(function (dbObj) {printjson(db.getSiblingDB(dbObj["name"]).stats(1024*1024*1024));});'

mhelmstetter

db = db.getSiblingDB("admin");
dbs = db.runCommand({ "listDatabases": 1 }).databases;
dbs.forEach(function(database) {
    db = db.getSiblingDB(database.name);
    cols = db.getCollectionNames();
    cols.forEach(function(col) {
        print(`*** ${col} ***`);
        printjson(db.getCollection(col).getIndexes());
    });
});

mhelmstetter

// Number of chars of the first two groups (most-significant) in UUID string
var UUIDHeadChars = 12;
// Max number of integers that can be represented using
var UUIDHeadMax = Math.pow(16, UUIDHeadChars);


function UUIDFromInt(num) {
    assert(num < UUIDHeadMax);
    // Format num as hexadecimal string with enough left-zero-padding
    // to reach UUIDHeadChars

mhelmstetter

db.adminCommand( { listDatabases: 1 } ).databases.forEach(function (dbObj) {
    var dbName = dbObj["name"];
	if (dbName != null) {
		var collectionNames = db.getSiblingDB(dbName).getCollectionNames();
		collectionNames.forEach(function (collName) {
		    if (collName != null) {
			    var count = db.getSiblingDB(dbName).getCollection(collName).count();
				print(`${dbName}.${collName}: ${count}`)
			}
		});

mhelmstetter

db.getCollectionNames().forEach(function(coll) {
  var indexes = db[coll].getIndexes();
  indexes.forEach(function(ix) {
    if (ix["expireAfterSeconds"] !== undefined) {
      print(`${ix.ns} ${ix["expireAfterSeconds"]}`);
	  var collName = ix.ns.split('.')[1];
	  var mod = db.runCommand({
	    "collMod": collName,
	    "index": {
	      name: ix.name,

mhelmstetter

[Unit]
Description=Disable Transparent Huge Pages (THP)
DefaultDependencies=no
After=sysinit.target local-fs.target
Before=mongod.service

[Service]
Type=oneshot
ExecStart=/bin/sh -c 'echo never | tee /sys/kernel/mm/transparent_hugepage/enabled > /dev/null'
ExecStart=/bin/sh -c 'echo never | tee /sys/kernel/mm/transparent_hugepage/defrag > /dev/null'