How do I force Oracle to use an index range scan?

How do I force Oracle to use an index range scan?

To “force” Oracle to use an index range scan, simply use an optimizer hint INDEX_RS_ASC. For example:

What is a granule in Oracle parallelism?

The basic unit of parallelism is a called a granule. The operation being parallelized (a table scan, table update, or index creation, for example) is divided by Oracle into granules. Parallel execution processes execute the operation one granule at a time.

What are some examples of parallel execution in SQL?

You can use parallel execution for any of the following: Some examples are table scans, index full scans, and partitioned index range scans. Some examples are nested loop, sort merge, hash, and star transformation. Some examples are CREATE TABLE AS SELECT, CREATE INDEX, REBUILD INDEX, REBUILD INDEX PARTITION, and MOVE / SPLIT / COALESCE PARTITION.

What are block range granules in Oracle?

Block range granules are ranges of physical blocks from a table. Because they are based on physical data addresses, Oracle can size block range granules to allow better load balancing. Block range granules permit dynamic parallelism that does not depend on static preallocation of tables or indexes.

What is indexindex unique scan in Oracle SQL?

Index unique scan used by the optimizer when the output of the query is utmost is one row. For unique scan to work the index should be created on primary or foreign key and the index column must be used in where clause or in other words we can say that primary key constraint must be specified with the equality condition. INDEX RANGE SCAN in ORACLE

How do I access data from an index?

You must supply AT LEAST the leading column of the index to access data via the index (however this may return > 1 row as the uniqueness will not be guaranteed). For example: Index range scan Index range scan is a method for accessing a range values of a particular column.

What is the difference between index range scan and unique scan?

For unique scan to work the index should be created on primary or foreign key and the index column must be used in where clause or in other words we can say that primary key constraint must be specified with the equality condition. Index range scan is used by the optimizer when the result consists of multiple rows.