Astra DB Cassandra Query Language (CQL) limits
To ensure high availability and optimum performance, Astra DB Serverless databases have guardrails on underlying Apache Cassandra® functionality, including commands and functionality available through the Cassandra Query Language (CQL) for Astra DB. For more information, see Database limits.
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As an alternative to the CQL shell and drivers, you can use the Data API to work with structured tables. For information about working with existing CQL tables through the Data API, including the CQL commands and types that the Data API supports, see Migrate from CQL. |
User-defined objects
Astra DB Serverless does not support user-defined functions (UDFs) or user-defined aggregate functions (UDAs).
Ignored values
If you try to use a CQL command with unsupported data definition language (DDL) properties, the command works, but ignores the unsupported values.
For example:
CREATE TABLE IF NOT EXISTS library.books
(
id UUID PRIMARY KEY,
lastname text,
firstname text)
WITH nodesync={'enabled': 'true'};The table is created with the defined attributes, except for the nodesync values. The results show a warning that lists the unsupported values, which are ignored:
Warnings :
Ignoring provided values [nodesync] as they are not supported for Table
Properties(ignored values are: [additional_write_policy,
bloom_filter_fp_chance, caching, cdc, compaction, compression,
crc_check_chance, dse_edge_label_property, dse_vertex_label_property,
gc_grace_seconds, id, max_index_interval, memtable,
memtable_flush_period_in_ms, min_index_interval, nodesync, read_repair,
speculative_retry])Unsupported CQL commands
Operations concerning keyspaces, materialized views, functions, aggregates, and search indexes are generally not supported. This affects the following CQL commands, which are not supported in Astra DB Serverless:
-
CREATE KEYSPACE -
ALTER KEYSPACE -
DROP KEYSPACE -
CREATE MATERIALIZED VIEW -
ALTER MATERIALIZED VIEW -
DROP MATERIALIZED VIEW -
CREATE AGGREGATE -
DESCRIBE AGGREGATE -
DROP AGGREGATE -
CREATE FUNCTION -
DESCRIBE FUNCTION -
DROP FUNCTION -
CREATE TRIGGER -
DROP TRIGGER -
CREATE ROLE -
ALTER ROLE -
DROP ROLE -
LIST ROLES -
LIST PERMISSIONS -
RESTRICT -
RESTRICT ROWS -
UNRESTRICT -
UNRESTRICT ROWS -
CREATE SEARCH INDEX -
COMMIT SEARCH INDEX -
REBUILD SEARCH INDEX -
RELOAD SEARCH INDEX -
ALTER SEARCH INDEX SCHEMA -
ALTER SEARCH INDEX CONFIG -
DROP SEARCH INDEX CONFIG
For a list of supported CQL commands, see the CQL quick reference.
