diff --git a/package.json b/package.json
index 2096309700..302ce6e888 100644
--- a/package.json
+++ b/package.json
@@ -26,6 +26,7 @@
     "commander": "^2.9.0",
     "deepcopy": "^0.6.1",
     "express": "^4.13.4",
+    "intersect": "^1.0.1",
     "lru-cache": "^4.0.0",
     "mailgun-js": "^0.7.7",
     "mime": "^1.3.4",
diff --git a/spec/ParseQuery.spec.js b/spec/ParseQuery.spec.js
index 08d5ed46c8..334ac1b62c 100644
--- a/spec/ParseQuery.spec.js
+++ b/spec/ParseQuery.spec.js
@@ -2228,4 +2228,22 @@ describe('Parse.Query testing', () => {
       });
     });
   });
+
+  it('objectId containedIn with multiple large array', done => {
+    let obj = new Parse.Object('MyClass');
+    obj.save().then(obj => {
+      let longListOfStrings = [];
+      for (let i = 0; i < 130; i++) {
+        longListOfStrings.push(i.toString());
+      }
+      longListOfStrings.push(obj.id);
+      let q = new Parse.Query('MyClass');
+      q.containedIn('objectId', longListOfStrings);
+      q.containedIn('objectId', longListOfStrings);
+      return q.find();
+    }).then(results => {
+      expect(results.length).toEqual(1);
+      done();
+    });
+  });
 });
diff --git a/spec/ParseRelation.spec.js b/spec/ParseRelation.spec.js
index 8b38a8e31c..fbb2b1d35c 100644
--- a/spec/ParseRelation.spec.js
+++ b/spec/ParseRelation.spec.js
@@ -248,46 +248,50 @@ describe('Parse.Relation testing', () => {
     });
   });
 
-  it("queries on relation fields with multiple ins", (done) => {
-    var ChildObject = Parse.Object.extend("ChildObject");
-    var childObjects = [];
-    for (var i = 0; i < 10; i++) {
+  it("queries on relation fields with multiple containedIn (regression test for #1271)", (done) => {
+    let ChildObject = Parse.Object.extend("ChildObject");
+    let childObjects = [];
+    for (let i = 0; i < 10; i++) {
       childObjects.push(new ChildObject({x: i}));
     }
 
     Parse.Object.saveAll(childObjects).then(() => {
-      var ParentObject = Parse.Object.extend("ParentObject");
-      var parent = new ParentObject();
+      let ParentObject = Parse.Object.extend("ParentObject");
+      let parent = new ParentObject();
       parent.set("x", 4);
-      var relation = parent.relation("child");
-      relation.add(childObjects[0]);
-      relation.add(childObjects[1]);
-      relation.add(childObjects[2]);
-      var parent2 = new ParentObject();
+      let parent1Children = parent.relation("child");
+      parent1Children.add(childObjects[0]);
+      parent1Children.add(childObjects[1]);
+      parent1Children.add(childObjects[2]);
+      let parent2 = new ParentObject();
       parent2.set("x", 3);
-      var relation2 = parent2.relation("child");
-      relation2.add(childObjects[4]);
-      relation2.add(childObjects[5]);
-      relation2.add(childObjects[6]);
-
-      var otherChild2 = parent2.relation("otherChild");
-      otherChild2.add(childObjects[0]);
-      otherChild2.add(childObjects[1]);
-      otherChild2.add(childObjects[2]);
-
-      var parents = [];
-      parents.push(parent);
-      parents.push(parent2);
-      return Parse.Object.saveAll(parents);
+      let parent2Children = parent2.relation("child");
+      parent2Children.add(childObjects[4]);
+      parent2Children.add(childObjects[5]);
+      parent2Children.add(childObjects[6]);
+
+      let parent2OtherChildren = parent2.relation("otherChild");
+      parent2OtherChildren.add(childObjects[0]);
+      parent2OtherChildren.add(childObjects[1]);
+      parent2OtherChildren.add(childObjects[2]);
+
+      return Parse.Object.saveAll([parent, parent2]);
     }).then(() => {
-      var query = new Parse.Query(ParentObject);
-      var objects = [];
-      objects.push(childObjects[0]);
-      query.containedIn("child", objects);
-      query.containedIn("otherChild", [childObjects[0]]);
-      return query.find();
-    }).then((list) => {
-      equal(list.length, 2, "There should be 2 results");
+      let objectsWithChild0InBothChildren = new Parse.Query(ParentObject);
+      objectsWithChild0InBothChildren.containedIn("child", [childObjects[0]]);
+      objectsWithChild0InBothChildren.containedIn("otherChild", [childObjects[0]]);
+      return objectsWithChild0InBothChildren.find();
+    }).then(objectsWithChild0InBothChildren => {
+      //No parent has child 0 in both it's "child" and "otherChild" field;
+      expect(objectsWithChild0InBothChildren.length).toEqual(0);
+    }).then(() => {
+      let objectsWithChild4andOtherChild1 = new Parse.Query(ParentObject);
+      objectsWithChild4andOtherChild1.containedIn("child", [childObjects[4]]);
+      objectsWithChild4andOtherChild1.containedIn("otherChild", [childObjects[1]]);
+      return objectsWithChild4andOtherChild1.find();
+    }).then(objects => {
+      // parent2 has child 4 and otherChild 1
+      expect(objects.length).toEqual(1);
       done();
     });
   });
diff --git a/src/Controllers/DatabaseController.js b/src/Controllers/DatabaseController.js
index 2513911488..e98f857600 100644
--- a/src/Controllers/DatabaseController.js
+++ b/src/Controllers/DatabaseController.js
@@ -1,6 +1,8 @@
 // A database adapter that works with data exported from the hosted
 // Parse database.
 
+import intersect from 'intersect';
+
 var mongodb = require('mongodb');
 var Parse = require('parse/node').Parse;
 
@@ -492,18 +494,28 @@ DatabaseController.prototype.reduceRelationKeys = function(className, query) {
   }
 };
 
-DatabaseController.prototype.addInObjectIdsIds = function(ids, query) {
-  if (typeof query.objectId == 'string') {
-    // Add equality op as we are sure
-    // we had a constraint on that one
-    query.objectId = {'$eq': query.objectId};
+DatabaseController.prototype.addInObjectIdsIds = function(ids = null, query) {
+  let idsFromString = typeof query.objectId === 'string' ? [query.objectId] : null;
+  let idsFromEq = query.objectId && query.objectId['$eq'] ? [query.objectId['$eq']] : null;
+  let idsFromIn = query.objectId && query.objectId['$in'] ? query.objectId['$in'] : null;
+
+  let allIds = [idsFromString, idsFromEq, idsFromIn, ids].filter(list => list !== null);
+  let totalLength = allIds.reduce((memo, list) => memo + list.length, 0);
+
+  let idsIntersection = [];
+  if (totalLength > 125) {
+    idsIntersection = intersect.big(allIds);
+  } else {
+    idsIntersection = intersect(allIds);
   }
-  query.objectId = query.objectId || {};
-  let queryIn =  [].concat(query.objectId['$in'] || [], ids || []);
-  // make a set and spread to remove duplicates
-  // replace the $in operator as other constraints
-  // may be set
-  query.objectId['$in'] = [...new Set(queryIn)];
+
+  // Need to make sure we don't clobber existing $lt or other constraints on objectId.
+  // Clobbering $eq, $in and shorthand $eq (query.objectId === 'string') constraints
+  // is expected though.
+  if (!('objectId' in query) || typeof query.objectId === 'string') {
+    query.objectId = {};
+  }
+  query.objectId['$in'] = idsIntersection;
 
   return query;
 }
@@ -523,7 +535,7 @@ DatabaseController.prototype.addInObjectIdsIds = function(ids, query) {
 // anything about users, ideally. Then, improve the format of the ACL
 // arg to work like the others.
 DatabaseController.prototype.find = function(className, query, options = {}) {
-  var mongoOptions = {};
+  let mongoOptions = {};
   if (options.skip) {
     mongoOptions.skip = options.skip;
   }
@@ -531,45 +543,39 @@ DatabaseController.prototype.find = function(className, query, options = {}) {
     mongoOptions.limit = options.limit;
   }
 
-  var isMaster = !('acl' in options);
-  var aclGroup = options.acl || [];
-  var acceptor = function(schema) {
-    return schema.hasKeys(className, keysForQuery(query));
-  };
-  var schema;
-  return this.loadSchema(acceptor).then((s) => {
+  let isMaster = !('acl' in options);
+  let aclGroup = options.acl || [];
+  let acceptor = schema => schema.hasKeys(className, keysForQuery(query))
+  let schema = null;
+  return this.loadSchema(acceptor).then(s => {
     schema = s;
     if (options.sort) {
       mongoOptions.sort = {};
-      for (var key in options.sort) {
-        var mongoKey = transform.transformKey(schema, className, key);
+      for (let key in options.sort) {
+        let mongoKey = transform.transformKey(schema, className, key);
         mongoOptions.sort[mongoKey] = options.sort[key];
       }
     }
 
     if (!isMaster) {
-      var op = 'find';
-      var k = Object.keys(query);
-      if (k.length == 1 && typeof query.objectId == 'string') {
-        op = 'get';
-      }
+      let op = typeof query.objectId == 'string' && Object.keys(query).length === 1 ?
+        'get' :
+        'find';
       return schema.validatePermission(className, aclGroup, op);
     }
     return Promise.resolve();
-  }).then(() => {
-    return this.reduceRelationKeys(className, query);
-  }).then(() => {
-    return this.reduceInRelation(className, query, schema);
-  }).then(() => {
-    return this.adaptiveCollection(className);
-  }).then(collection => {
-    var mongoWhere = transform.transformWhere(schema, className, query);
+  })
+  .then(() => this.reduceRelationKeys(className, query))
+  .then(() => this.reduceInRelation(className, query, schema))
+  .then(() => this.adaptiveCollection(className))
+  .then(collection => {
+    let mongoWhere = transform.transformWhere(schema, className, query);
     if (!isMaster) {
-      var orParts = [
+      let orParts = [
         {"_rperm" : { "$exists": false }},
         {"_rperm" : { "$in" : ["*"]}}
       ];
-      for (var acl of aclGroup) {
+      for (let acl of aclGroup) {
         orParts.push({"_rperm" : { "$in" : [acl]}});
       }
       mongoWhere = {'$and': [mongoWhere, {'$or': orParts}]};
diff --git a/src/transform.js b/src/transform.js
index 3ca9739b11..6c1b85ec32 100644
--- a/src/transform.js
+++ b/src/transform.js
@@ -187,13 +187,12 @@ export function transformKeyValue(schema, className, restKey, restValue, options
 // Returns the mongo form of the query.
 // Throws a Parse.Error if the input query is invalid.
 function transformWhere(schema, className, restWhere) {
-  var mongoWhere = {};
+  let mongoWhere = {};
   if (restWhere['ACL']) {
-    throw new Parse.Error(Parse.Error.INVALID_QUERY,
-                          'Cannot query on ACL.');
+    throw new Parse.Error(Parse.Error.INVALID_QUERY, 'Cannot query on ACL.');
   }
-  for (var restKey in restWhere) {
-    var out = transformKeyValue(schema, className, restKey, restWhere[restKey],
+  for (let restKey in restWhere) {
+    let out = transformKeyValue(schema, className, restKey, restWhere[restKey],
                                 {query: true, validate: true});
     mongoWhere[out.key] = out.value;
   }