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A database index is a data
structure that improves the speed of operations on a database table. Indices
can be created using one or more columns of a database table, providing the
basis for both rapid random lookups and efficient access of ordered records.
The disk space required to store the index is typically less than that
required by the table (since induces usually contain only the key-fields
according to which the table is to be arranged, and excludes all the other
details in the table), yielding the possibility to store induces in memory for
a table whose data is too large to store in memory.And types are:
structure that improves the speed of operations on a database table. Indices
can be created using one or more columns of a database table, providing the
basis for both rapid random lookups and efficient access of ordered records.
The disk space required to store the index is typically less than that
required by the table (since induces usually contain only the key-fields
according to which the table is to be arranged, and excludes all the other
details in the table), yielding the possibility to store induces in memory for
a table whose data is too large to store in memory.And types are:
Bitmap index
Dense index
Sparse index
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Thanks for answering...what is importance of these indexes?
Identifying importance values for individual database requests; and designing indexes to tables for the requests by identifying, by order of request importance, candidate indexes for requests, searching previously identified indexes for an index that is similar to each candidate index, and building upon previously identified indexes by reusing existing indexes and modifying existing indexes based upon match between indexes and upon importance values of requests for which the indexes are created.
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