MongoDB Text Index

Enable text Search:

The initial text search is an experimental feature, but the 2.6 version starts with the configuration enabled by default. However, if you are using a previous MongoDB version, you must enable text search, using the following code:

>db.  Admincommand({setparameter:true,textsearchenabled:True})  

To create a text index:

Consider the post collection for which the text is tagged, including the following files:

{   "Post_text":"Enjoy the MongoDB articles on Yiibai","tags":["MongoDB" ,"Yiibai"]}           

We will create a text index of the Post_text field so that we can search for text in our posts:

>db.  Posts.  Ensureindex({post_text:"text"})         

Use a text index:

Now that we have created the index of the text Post_text field, we will search for all posts that contain the word yiibai.com.

>db.  Posts.  Find({$text: {$search:"yiibai.com"}})      

The above command returns a post that contains yiibai words in the text, such as the following result document:

{    "_id": ObjectId ("53493d14d852429c10000002"),    "Post_text": "Enjoy the MongoDB articles on yiibai.com",    " Tags ": [" MongoDB "," yiibai.com "]}{   " _id ": ObjectId (" 53493d1fd852429c10000003 "),    " Post_text ":" Writing Tutorials on MongoDB ",   " tags ": [" MongoDB "," Tutorial "]}

If you are using an older version of MongoDB, you must use the following command:

>db.  Posts.  RunCommand("text", {search:"yiibai.com"})     

The use of text search is much more efficient than regular search.

To delete a text index:

To delete an existing text index, use the following query to first find the name of the index:

>db.  Posts.  Getindexes()     

After you get the name of the index from the above query, run the following command. Here, Post_text_text is the name of the index.

>db.  Posts.  Dropindex("Post_text_text")       

MongoDB Text Index