Description

The DROP STREAM statement deletes the specified stream from the database. The IF EXISTS clause allows the statement to succeed even if the specified stream does not exist. If the stream does not exist and you do not include the IF EXISTS clause, the statement will return an error.

If you use the CASCADE clause, VoltDB automatically drops any referencing views as well as the stream itself.

If the stream is associated with an export target (that is, the stream was created with the EXPORT TO TARGET clause), dropping the stream also deletes any pending records that were inserted into the stream but have not been committed to the export target yet. If you want to change the stream definition without losing any pending export data, use the ALTER STREAM statement. If you want to remove the stream but ensure all export data is flushed before it is dropped, you can either use the voltadmin pause --wait command (to flush all queues) or the @Statistics system procedure with the EXPORT selector to check that the specified target has no pending records.

Example

The following example uses DROP STREAM with the IF EXISTS clause to remove the MeterReadings stream definition.

DROP STREAM MeterReadings IF EXISTS;