An Index is an optional structure associated with a table to have direct access to rows, which can be created to increase the performance of data retrieval. Index can be created on one or more columns
The related columns of the tables in a cluster is called the Cluster Key.
A Cluster with an index on the Cluster Key.
A row is stored in a hash cluster based on the result of applying a hash function to the row's cluster key value. All rows with the same hash key value are stores together on disk.
Latest Answer : Hash Clusters cluster table data in a manner similar to normal, index clusters. To find or store a row in a hash cluster, Oracle applies a hash function to the row's cluster key value. The resulting hash value corresponds to a data block in the cluster.All ...
Hash clusters are better choice when a table is often queried with equality queries. For such queries the specified cluster key value is hashed. The resulting hash key value points directly to the area
Data Segment, Index Segment, Rollback Segment and Temporary Segment.
Latest Answer : Data, index , rollback, undo,cluster ...
Each Non-clustered table has a data segment. All of the table's data is stored in the extents of its data segment. Each cluster has a data segment. The data of every table in the cluster is stored
Latest Answer : it's you table, index and else ...
Each Index has an Index segment that stores all of its data.
Latest Answer : It's an oracle object as other object like table. It stores index key + rowid for that key. So when you scan index it finds respective rowid and fetch data from that rowid. and it's faster ...
Latest Answer : Bitmap index:------------A type of index that uses a string of bits to quickly locate rows in a table. Bitmap indexes are normally used to index low cardinality columns in a warehouse environment.Btree index:------------A type of index that ...
