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10 paź 2016 · If you want to create a index to a table in another schema first you need to grant the system privilege to the user you want use to create de index. To create an index in another schema, you must have the CREATE ANY INDEX system privilege.
22 lis 2010 · To add an index to a table without a lock resulting on UPDATE/ INSERT, the following statement format can be used: ALTER TABLE my_table ADD INDEX my_table__idx (my_column), ALGORITHM=INPLACE, LOCK=NONE;
CREATE INDEX enables you to add indexes to existing tables. CREATE INDEX is mapped to an ALTER TABLE statement to create indexes. See Section 13.1.9, “ALTER TABLE Statement”. CREATE INDEX cannot be used to create a PRIMARY KEY; use ALTER TABLE instead.
The CREATE INDEX statement is used to create indexes in tables. Indexes are used to retrieve data from the database more quickly than otherwise. The users cannot see the indexes, they are just used to speed up searches/queries.
19 wrz 2012 · CREATE INDEX index_name ON mytable(column); You need to run. SELECT COUNT(1) IndexIsThere FROM INFORMATION_SCHEMA.STATISTICS WHERE table_schema=DATABASE() AND table_name='mytable' AND index_name='index_name'; If IndexIsThere is 0, you can create in the index. Perhaps you can write a stored procedure to create an index on the table of your choice.
Oracle Database enforces a UNIQUE key or PRIMARY KEY integrity constraint on a table by creating a unique index on the unique key or primary key. This index is automatically created by the database when the constraint is enabled.
Use the CREATEINDEX statement to create an index on: One or more columns of a table, a partitioned table, an index-organized table, or a cluster. One or more scalar typed object attributes of a table or a cluster. A nested table storage table for indexing a nested table column.
