In this chapter, we will discuss the concepts like, compaction and retrieval of bulk data from PouchDB.

Compaction

You can reduce the size of a database by removing the unused data using compact() method. You can compact a local database as well as remote database using this method.

Following is an example demonstrating the usage of the compact() method in PouchDB.

//Requiring the package
var PouchDB = require(''PouchDB'');

//Creating the database object
var db = new PouchDB(''sample_database'');

db.compact(function (err, result) {
   if (err) {
      return console.log(err);
   } else {
      console.log(result);
   }
});

BulkGet Method

You can retrieve a set of documents in bulk using the bulkGet() method. To this method, you need to pass a set of id’s and _rev’s.

Following is an example demonstrating the usage of the bulkGet() method in PouchDB.

//Requiring the package
var PouchDB = require(''PouchDB'');

//Creating the database object
var db = new PouchDB(''my_database'');

//Preparing documents
//Inserting Document
db.bulkGet({docs: [
   { id: "001", rev: "1-5dc593eda0e215c806677df1d12d5c47"},
   { id: "002", rev: "1-2bfad8a9e66d2679b99c0cab24bd9cc8"},
   { id: "003", rev: "1-7cff4a5da1f97b077a909ff67bd5b047"} ]}, function(err, result) {
   if (err) {
      return console.log(err);
   } else {
      console.log(result);
   }
});