What is indexing in DBMS? Types of indexing?
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Indexing is a data structure technique used to find data more quickly and efficiently in a table. An index is a small table having only two columns. The first column having candidate key of a table and second column contains a set of pointers which is holding the address of the disk block where that particular key value can be found. data is stored like a records.Every record has a key field. Indexing is a data structure technique to efficiently access records from the database files which is work on attributes on the indexing has been done.
Indexes are of 3 types :
- Primary indexes
- Secondary indexes
- Clustering indexes