SHOW SOURCES
SHOW SOURCES returns a list of all sources available to your Materialize
instances.
Syntax
| Field | Use |
|---|---|
| schema_name | The schema to show sources from. Defaults to public in the current database. For available schemas, see SHOW SCHEMAS. |
| MATERIALIZED | Only return materialized sources, i.e. those with indexes. Without specifying this option, this command returns all sources, including non-materialized sources. |
| FULL | Return details about your sources. |
Details
Output format for SHOW FULL SOURCES
SHOW FULL SOURCES's output is a table, with this structure:
name | type | materialized | volatility
-------+------+--------------+-----------
... | ... | ... | ...
| Field | Meaning |
|---|---|
| name | The name of the source |
| type | Whether the source was created by the user or the system |
| materialized | Does the source have an in-memory index? For more details, see CREATE INDEX |
| volatility | Whether the source is volatile. Either volatile, nonvolatile, or unknown. |
Changed in v0.5.0:
The output column is renamed from SOURCES to name.
New in v0.7.2:
The volatile column.
Internal statistic sources
Materialize comes with a number of sources that contain internal statistics
about the instance’s behavior. These are kept in a “hidden” schema called
mz_catalog.
To view the internal statistic sources use:
SHOW SOURCES FROM mz_catalog;
To select from these sources, you must specify that you want to read from the
source in the mz_catalog schema.
Examples
Default behavior
SHOW SCHEMAS;
public
SHOW SOURCES FROM public;
my_stream_source
my_file_source
SHOW SOURCES;
my_stream_source
my_file_source
Only show materialized sources
SHOW MATERIALIZED SOURCES;
name
----------------------
my_materialized_source
Show details about sources
SHOW FULL SOURCES
name | type | materialized
---------------------------+------+--------------
my_nonmaterialized_source | user | f
my_materialized_source | user | t