SQL ALTER INDEX
Alter Index
The ALTER INDEX statement is used to alter the definition of an index.
Note : The ALTER INDEX command is not a part of the ANSI SQL standard, and thus its syntax varies among vendors.
Syntax:
ALTER [UNIQUE] INDEX <index name> ON <table name> (<column(s)>);
Parameters:
Name | Description |
---|---|
UNIQUE | Defines the index as a unique constraint for the table and disallows any duplicate values into the indexed column or columns of the table. |
index_name | Name of the index table. |
table_name | Name of a base table. |
column(s) | Name of the columns of the table. |
Alter Index in PostgreSQL, Oracle, SQL Server
Alter Index in PostgreSQL 9.3.13
In PostgreSQL, ALTER INDEX command changes the definition of an existing index.
Syntax:
ALTER INDEX [ IF EXISTS ] name RENAME TO new_name ALTER INDEX [ IF EXISTS ] name SET TABLESPACE tablespace_name ALTER INDEX [ IF EXISTS ] name SET ( storage_parameter = value [, ... ] ) ALTER INDEX [ IF EXISTS ] name RESET ( storage_parameter [, ... ] )
Alter Index in Oracle 11g
In Oracle ALTER INDEX statement is used to change or rebuild an existing index.
Prerequisites :
- The index must be in your own schema or you must have to ALTER ANY INDEX system privilege.
- To execute the MONITORING USAGE clause, the index must be in your own schema.
- To modify a domain index, you must have EXECUTE object privilege on the index type of the index.
- Schema object privileges are granted on the parent index, not on individual index partitions or subpartitions.
- You must have tablespace quota to modify, rebuild, or split an index partition or to modify or rebuild an index subpartition.
Syntax:
ALTER INDEX [ schema. ]index { { deallocate_unused_clause | allocate_extent_clause | shrink_clause | parallel_clause | physical_attributes_clause | logging_clause } ... | rebuild_clause | PARAMETERS ( 'ODCI_parameters' ) ) | COMPILE | { ENABLE | DISABLE } | UNUSABLE | VISIBLE | INVISIBLE | RENAME TO new_name | COALESCE | { MONITORING | NOMONITORING } USAGE | UPDATE BLOCK REFERENCES | alter_index_partitioning }
Alter Index in SQL Server 2014
In SQL Server ALTER INDEX command changes the definition of an existing index.
Syntax:
-- SQL Server Syntax ALTER INDEX { index_name | ALL } ON <object> { REBUILD { [ PARTITION = ALL ] [ WITH ( <rebuild_index_option> [ ,...n ] ) ] | [ PARTITION = partition_number [ WITH ( <single_partition_rebuild_index_option> ) [ ,...n ] ] } | DISABLE | REORGANIZE [ PARTITION = partition_number ] [ WITH ( <reorganize_option> ) ] | SET ( <set_index_option> [ ,...n ] ) } [ ; ] <object> ::= { [ database_name. [ schema_name ] . | schema_name. ] table_or_view_name } <rebuild_index_option > ::= { PAD_INDEX = { ON | OFF } | FILLFACTOR = fillfactor | SORT_IN_TEMPDB = { ON | OFF } | IGNORE_DUP_KEY = { ON | OFF } | STATISTICS_NORECOMPUTE = { ON | OFF } | STATISTICS_INCREMENTAL = { ON | OFF } | ONLINE = { ON [ ( WAIT_AT_LOW_PRIORITY ( MAX_DURATION = <time> [ MINUTES ] , ABORT_AFTER_WAIT = { NONE | SELF | BLOCKERS } ) ) ] | OFF } | ALLOW_ROW_LOCKS = { ON | OFF } | ALLOW_PAGE_LOCKS = { ON | OFF } | MAXDOP = max_degree_of_parallelism | COMPRESSION_DELAY = {0 | delay [Minutes]} | DATA_COMPRESSION = { NONE | ROW | PAGE | COLUMNSTORE | COLUMNSTORE_ARCHIVE } [ ON PARTITIONS ( {<partition_number> [ TO <partition_number>] } [ , ...n ] ) ] } <single_partition_rebuild_index_option> ::= { SORT_IN_TEMPDB = { ON | OFF } | MAXDOP = max_degree_of_parallelism | DATA_COMPRESSION = { NONE | ROW | PAGE | COLUMNSTORE | COLUMNSTORE_ARCHIVE} } | ONLINE = { ON [ ( <low_priority_lock_wait> ) ] | OFF } } <reorganize_option>::= { LOB_COMPACTION = { ON | OFF } | COMPRESS_ALL_ROW_GROUPS = { ON | OFF} } <set_index_option>::= { ALLOW_ROW_LOCKS = { ON | OFF } | ALLOW_PAGE_LOCKS = { ON | OFF } | IGNORE_DUP_KEY = { ON | OFF } | STATISTICS_NORECOMPUTE = { ON | OFF } | COMPRESSION_DELAY= {0 | delay [Minutes]} } <low_priority_lock_wait>::= { WAIT_AT_LOW_PRIORITY ( MAX_DURATION = <time> [ MINUTES ] , ABORT_AFTER_WAIT = { NONE | SELF | BLOCKERS } )
See Also : CREATE INDEX for information on creating an index.
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