system.stream_status

Introduced or updated: v1.2.225

Provides information about the status of a specified stream, yielding a single-column result (has_data) that can take on values of true or false:

• true: Indicates that the stream might contain change data capture records.
• false: Indicates that the stream currently does not contain any change data capture records.

note

The presence of a true in the result (has_data) does not ensure the definite existence of change data capture records. Other operations, such as performing a table compact operation, could also lead to a true value even when there are no actual change data capture records.

Syntax

SELECT * FROM STREAM_STATUS('<stream_name>');

Examples

-- Create a table 't' with a column 'c'
CREATE TABLE t (c int);

-- Create a stream 's' on the table 't'
CREATE STREAM s ON TABLE t;

-- Check the initial status of the stream 's'
SELECT * FROM STREAM_STATUS('s');

-- The result should be 'false' indicating no change data capture records initially
┌──────────┐
│ has_data │
├──────────┤
│ false    │
└──────────┘

-- Insert a value into the table 't'
INSERT INTO t VALUES (1);

-- Check the updated status of the stream 's' after the insertion
SELECT * FROM STREAM_STATUS('s');

-- The result should now be 'true' indicating the presence of change data capture records
┌──────────┐
│ has_data │
├──────────┤
│ true     │
└──────────┘