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It is a bad practice to frequently create and drop temporary tables in Oracle. CREATE GLOBAL TEMPORARY TABLE today_sales(order_id NUMBER) ON COMMIT PRESERVE ROWS; Oracle 18c added private temporary tables, which are single-session in-memory objects.
This 15-minute tutorial shows you how create and use private temporary tables and how to manage them in your session. Background. Prior to Oracle Database 18c, only Global Temporary Tables existed.
This tutorial shows you how to use the CREATE PRIVATE TEMPORARY TABLE statement to create a new session or transaction-specific private temporary table.
To create a global temporary table, you use the CREATE GLOBAL TEMPORARY TABLE statement as follows: CREATE GLOBAL TEMPORARY TABLE table_name ( column_definition, ..., table_constraints. ) ON COMMIT [DELETE ROWS | PRESERVE ROWS]; Code language: SQL (Structured Query Language) (sql)
Creating a temporary table in Oracle involves the CREATE GLOBAL TEMPORARY TABLE statement, plus the table name and column definitions. It’s important to use the ON COMMIT option correctly; this defines whether the data is kept or erased after a transaction.
A session becomes bound to a temporary table with an INSERT operation on the table. A session becomes unbound to a temporary table with a TRUNCATE statement or at session termination, or, for a transaction-specific temporary table, by issuing a COMMIT or ROLLBACK statement.
Regardless, you can use v$lock to see who's got it: ops$tkyte@ORA717DEV.US.ORACLE.COM> create global temporary table t ( x int ) on commit preserve rows; ops$tkyte@ORA717DEV.US.ORACLE.COM> insert into t values ( 1 ); ops$tkyte@ORA717DEV.US.ORACLE.COM> select * from v$lock 2 where id1 = ( select object_id from user_objects where object_name = 'T ...
