MongoDB

/* If the user does not exist. */
use admin;
db.createUser({ user: "artie", pwd: "<password>", roles: ["readAnyDatabase", { role: "read", db: "local" }] });

/* If the user already exists */
db.updateUser("artie", { roles: ["readAnyDatabase", { role: "read", db: "local" }] });

// Enable preAndPostImage on the replica set
use admin;
db.runCommand({
   setClusterParameter: {
      changeStreamOptions: {
         preAndPostImages: {
            expireAfterSeconds: 100
         }
      }
   }
});

// Enable preAndPostImage on the collection
use databaseName;
db.runCommand({ collMod:"collectionName",changeStreamPreAndPostImages: { enabled: true } });

// See the previous setting
db.adminCommand( { getClusterParameter: "changeStreamOptions" } );

// To disable this behavior, you can set expiredAfterSeconds to off
db.runCommand( {
   setClusterParameter:
      { changeStreamOptions: {
         preAndPostImages: { expireAfterSeconds: 'off' }
      } }
} );