HOMEWORK 6.4 MONGODB

The query did not utilize an index to figure out which documents match the find criteria. The result should be Build Indexes in the Background. Changed in version 3. In this homework you will be enhancing the blog project to insert entries into the posts collection. What is the latency of the longest running operation to the collection, in milliseconds? From a different terminal window type the following from the command line:

You must load this dataset to complete the problem. We have provided the code that creates users and allows you to login the assignment from last week. The code is not 3. What would be the appropriate settings for w and j? There must be a index on the collection that starts with the shard key.

The query used an index for the sorting phase. After that, you just need to sort.

MongoDB university m101p chapter 6 homework

On unix, this could be done as follows: Querying with Sort, Skip and Limit. With the new schema, this problem is a lot harder and that is sort of the homwork.

  CAMILLA COLLETT ESSAY

ObjectId “52c54c93ead11dc57″”fname”: MongoDB replication 6.4 synchronous. MongoDB can not enforce unique indexes on a sharded collection other than the shard key itself, or indexes prefixed by the shard key. The query performed a full collection scan. In this homework you will build a small replica set on your own computer.

homework 6.4 mongodb

Create a Hashed Index. On unix, this could be done as follows: The blog has been enhanced so that it can also display the top 10 most recent posts by tag. Type the following commands into the mongo shell: At this point, the replica set should be coming up.

homework 6.4 mongodb

Knowledge of relational databases is not required. Now query the profile monfodb, looking for all queries to the students collection in the database school2sorted in order of decreasing latency.

Программирование с нуля.: MongoDB. Homework 6.

To get started, please download hwand Type the following commands into the mongo shell: What is the mongosb of the longest running operation to the collection, in milliseconds? This course should also prepare you to take the CDEV: Which of the following statements are true about choosing and using a shard key? It has been tested under Pymongo 2.

  NINA WOLFRUM DISSERTATION

In the course, you will mongoddb a blogging platform, backed by MongoDB. Connecting to a Replica Set from the Java Driver. Build Indexes on Replica Sets. On unix, this could be done as follows:. We will check that it works with validate.

The result should be The query returneddocuments Choice 4.

Check all that apply. We need to decide on a shard key to shard the record collection.

homewprk ObjectId “52c52aeaead11dc55″”hello”: There are one location. Also omit —fork and use start mongod with Windows compatible paths i. Omit -p from mkdir. The query is a covered query.