What is an index segment?

What is an index segment?
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Answer :

Each index has an index segment that stores all of its data.
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Related questions

What is an Index Segment ?

Description : What is an Index Segment ?

Last Answer : Each Index has an Index segment that stores all of its data.

Explain the difference between a data block, an extent and a segment.

Description : Explain the difference between a data block, an extent and a segment.

Last Answer : A data block is the smallest unit of logical storage for a database object. As objects grow they take chunks of additional storage that are composed of contiguous data blocks. These groupings ... that an object takes when grouped together are considered the segment of the database object.

What is a temporary segment?

Description : What is a temporary segment?

Last Answer : Temporary segments are created by Oracle when a SQL statement needs a temporary work area to complete execution. When the statement finishes execution, the temporary segment extents are released to the system for future use.

What are the uses of rollback segment?

Description : What are the uses of rollback segment?

Last Answer : A database contains one or more rollback segments to temporarily store "undo" information.

What are the uses of rollback segment?

Description : What are the uses of rollback segment?

Last Answer : A database contains one or more rollback segments to temporarily store "undo" information.

What is rollback segment?

Description : What is rollback segment?

Last Answer : A database contains one or more rollback segments to temporarily store "undo" information.

What is a data segment?

Description : What is a data segment?

Last Answer : 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 in the cluster's data segment.

What is a Segment ?

Description : What is a Segment ?

Last Answer : A segment is a set of extents allocated for a certain logical structure.

What is a Rollback segment entry ?

Description : What is a Rollback segment entry ?

Last Answer : It is the set of before image data blocks that contain rows that are modified by a transaction. Each Rollback Segment entry must be completed within one rollback segment. A single rollback segment can have multiple rollback segment entries.

How will you monitor rollback segment status ?

Description : How will you monitor rollback segment status ?

Last Answer : Querying the DBA_ROLLBACK_SEGS view IN USE - Rollback Segment is on-line. AVAILABLE - Rollback Segment available but not on-line. OFF-LINE - Rollback Segment off-line INVALID - Rollback ... corupted. PARTLY AVAILABLE - Contains data from an unresolved transaction involving a distributed database.

How will you force database to use particular rollback segment ?

Description : How will you force database to use particular rollback segment ?

Last Answer : SET TRANSACTION USE ROLLBACK SEGMENT rbs_name.

What is a data segment?

Description : What is a data segment?

Last Answer : Data segment are the physical areas within a database block in which the data associated with tables and clusters are stored.

How can one see who is using a temporary segment? (for DBA

Description : How can one see who is using a temporary segment? (for DBA

Last Answer : For every user using temporary space, there is an entry in SYS.V$_LOCK with type 'TS'. All temporary segments are named 'ffff.bbbb' where 'ffff' is the file it is in and 'bbbb' is ... For usage stats, see SYS.V_$SORT_SEGMENT From Oracle 8.0, one can just query SYS.v$sort_usage. Look at these

How are extents allocated to a segment? (for DBA)

Description : How are extents allocated to a segment? (for DBA)

Last Answer : Oracle8 and above rounds off extents to a multiple of 5 blocks when more than 5 blocks are requested. If one requests 16K or 2 blocks (assuming a 8K block size), Oracle doesn't round it up to 5 ... -block size. Oracle doesn't round it up to the multiple of 5 when a tablespace is locally managed.

What is Rollback Segment ?

Description : What is Rollback Segment ?

Last Answer : A Database contains one or more Rollback Segments to temporarily store "undo" information.

What is Automatic Management of Segment Space setting?

Description : What is Automatic Management of Segment Space setting?

Last Answer : Oracle9i New Feature Series: Automatic Segment Space Management Automatic Segment Space Management (ASSM) introduced in Oracle9i is an easier way of managing space in a segment using bitmaps. It ... . ASSM can be specified only with the locally managed tablespaces (LMT). Oracle uses bitmaps

How can you rebuild an index?

Description : How can you rebuild an index?

Last Answer : ALTER INDEX REBUILD;

What type of index should you use on a fact table?

Description : What type of index should you use on a fact table?

Last Answer : A Bitmap index.

Give the reasoning behind using an index.

Description : Give the reasoning behind using an index.

Last Answer : Faster access to data blocks in a table.

What is index cluster?

Description : What is index cluster?

Last Answer : A cluster with an index on the cluster key.

what is clustered index?

Description : what is clustered index?

Last Answer : In an indexed cluster, rows are stored together based on their cluster key values . Can not applied for HASH.

When should one rebuild an index? (for DBA

Description : When should one rebuild an index? (for DBA

Last Answer : You can run the 'ANALYZE INDEX VALIDATE STRUCTURE' command on the affected indexes - each invocation of this command creates a single row in the INDEX_STATS view. This row is overwritten by the next ANALYZE ... 'badness' of the index can then be judged by the ratio of 'DEL_LF_ROWS' to 'LF_ROWS'.

Why is Oracle not using the damn index? (for DBA

Description : Why is Oracle not using the damn index? (for DBA

Last Answer : This problem normally only arises when the query plan is being generated by the Cost Based Optimizer. The usual cause is because the CBO calculates that executing a Full Table Scan would be faster ... with AUTOTRACE to see the statistics. Compare this to the explain plan when not using an index.

What is an Index ? How it is implemented in Oracle Database ?

Description : What is an Index ? How it is implemented in Oracle Database ?

Last Answer : An index is a database structure used by the server to have direct access of a row in a table. An index is automatically created when a unique of primary key constraint clause is specified in create table comman (Ver 7.0)

What is Index Cluster ?

Description : What is Index Cluster ?

Last Answer : A Cluster with an index on the Cluster Key

How are the index updates?

Description : How are the index updates?

Last Answer : Indexes are automatically maintained and used by Oracle. Changes to table data are automatically incorporated into all relevant indexes.

What is an Oracle index?

Description : What is an Oracle index?

Last Answer : 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 of a table.

What is an Index ?

Description : What is an Index ?

Last Answer : 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 of a table.

What is a Global Index and Local Index?

Description : What is a Global Index and Local Index?

Last Answer : Local Index - each partition of a local index is associated with exactly one partition of the table. Global Index - global index is associated with multiple partitions of the table. ... - Global Hash Partitioned Indexes Global Nonpartitioned Indexes - behave just like a nonpartitioned index.

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Description : What is an Index Organized Table?

Last Answer : An index-organized table (IOT) is a type of table that stores data in a B*Tree index structure. Normal relational tables, called heap-organized tables, store rows in any order (unsorted). In contrast ... all the columns of the table (an exception to this rule - is being called the overflow area).

A Column is having many repeated values which type of index you should create on this column, if you have to?

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Last Answer : For example, assume there is a motor vehicle database with numerous low-cardinality columns such as car_color, car_make, car_model, and car_year. Each column contains less than 100 distinct values by themselves, and a b tree index would be fairly useless in a database of 20 million vehicles.

What is B-Tree Index?

Description : What is B-Tree Index?

Last Answer : A B-Tree index is a data structure in the form of a tree, but it is a tree of database blocks, not rows. Note: "B" is not for binary; it's balanced.

What is an Index Segment?

Description : What is an Index Segment?

Last Answer : Each Index has an Index segment that stores all of its data.

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Description : what is a display item?

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Description : What is the Oracle Intelligent Agent? (for DBA

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