database index types

What is index in SQL and types?
Indexes in SQL are the individual lookup tables, which are utilized by the data set internet searcher to accelerate the general information recovery.
The use of the index in SQL is to rapidly discover the data in a data set table without looking through each row of it.
What are the types of primary indexes?
There are two types of primary indexes: dense indexes and sparse indexes.
The primary index is typically created when the database is created and is used as the primary means of accessing data in the database.
Secondary indexes, on the other hand, can be created and dropped at any time, allowing for greater flexibility in managing the database.

How many types of index are there?

Index architectures are classified as clustered or non-clustered.
Clustered indexes are indexes whose order of the rows in the data pages corresponds to the order of the rows in the index.
This order is why only one clustered index can exist in any table, whereas, many non-clustered indexes can exist in the table.

Types of indexes

Bitmap index. Main article: Bitmap index.
Dense index. A dense index in databases is a file with pairs of keys and pointers for every record in the data file.
Sparse index.
Reverse index.
Inverted index.
Primary index.
Secondary index.
Hash index.

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