Apex provides collections such as List, Set, Map. These are similar to arrays, but these collections have advanced features and easier methods than an array. Set is a collection of unordered elements and don't contain any duplicate values.
Full text search is a custom implementation created by the MongoDB developers as a specific index type
Full text search as an index type when creating new indexes, just like any other. 1.Indexing of multiple fields, with weighting to give different fields higher priority. 2.Support for Latin based languages initially, with plans for other character sets later.
Advanced Queries of MongoDB: Inserting records to the database and retrieving data from database. 1. Wrapped Queries: Like, sort, limit, count. 2. Query Using Modifiers: set, increment, push,Set Elements in Array, AddToSet Modifier, each.
The group() command, Aggregation Framework and MapReduce are collectively aggregation features of MongoDB. group(): Group Performs simple aggregation operations on a collection documents. Group is similar to GROUP_BY in mysql. Output format : Returns result set inline. Sharding: Its not support in shared environment. Limitations: