In Oracle databases, an index refers to a data structure that advances the speed of data retrieval operations on a database table. However, this may come with a penalty of extra write operations and storage space on your database. In this tutorial, you will learn how to drop an existing ...
The index in Oracle can be defined as a schema object which stores an entry for each value that appears in the columns and for each value also the location of the rows that have that value which helps the database in improving efficiency as it helps the database to provide fast access t...
In addition, when you drop a domain index: Oracle Database invokes the appropriate routine. If any statistics are associated with the domain index, then Oracle Database disassociates the statistics types with theFORCEclause and removes the user-defined statistics collected with the statistics type....
One more parameter used in the CREATE INDEX statement is COMPUTE STATISTICS. It is an optional parameter telling Oracle to collect the statistics during index creation. Further, this stats data would serve when choosing the “plan of execution” of SQL statements. However, since Oracle 10, the ...
DROP INDEX [schema_name.]index_name;Code language: JavaScript (javascript) In this syntax: First, specify an optional schema name to which the index belongs. If you omit the schema name, Oracle assumes that the index is in your own schema. Second, specify the name of the index that you...
Name CREATE/ALTER/DROP INDEX Synopsis CREATE Syntax: CREATE [OR REPLACE] [UNIQUE | BITMAP] INDEX [schema.]indexname ON { CLUSTER [schema.]cluster Index_Attributes_Clause | [schema.] … - Selection from Oracle in a Nutshell [Book]
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DROPalias-designatorAUDIT POLICY原則名稱BUFFERPOOL緩衝池名稱DATABASE PARTITION GROUPdb-partition-group-nameEVENT MONITORevent-monitor-namefunction-designatorRESTRICTFUNCTION MAPPINGfunction-mapping-nameHISTOGRAM TEMPLATEtemplate-nameINDEX索引名稱1INDEX EXTENSIONindex-extension-nameRESTRICTMASKmask-namemethod-designatorRE...
drop_index_statement ::= DROP INDEX [IF EXISTS] index_name ON table_name Semantics If an index with the given name does not exist, then the statement fails, and an error is reported. If the optional IF EXISTS clause is used in the DROP INDEX statement, and if an index with the same...
DROP INDEX TheDROP INDEXcommand is used to delete an index in a table. MS Access: DROPINDEXindex_nameONtable_name; SQL Server: DROPINDEXtable_name.index_name; DB2/Oracle: DROPINDEXindex_name; MySQL: ALTERTABLEtable_name DROPINDEXindex_name;...