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Add check for large recorded materialization range #54

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merged 1 commit into from
Nov 13, 2025
Merged

Add check for large recorded materialization range #54

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29 changes: 29 additions & 0 deletions diagnostic.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,34 @@ BEGIN
END
$$ SET search_path = pg_catalog, pg_temp;

CREATE OR REPLACE FUNCTION check_cagg_large_materialization_range() RETURNS void LANGUAGE plpgsql AS
$$
DECLARE
cagg regclass;
range text;
BEGIN
FOR cagg, range IN
SELECT
format('%I.%I', c.user_view_schema, c.user_view_name)::regclass AS continuous_aggregate,
CASE
WHEN d.column_type =ANY('{int4,int8}'::regtype[]) THEN (r.greatest_modified_value - r.lowest_modified_value)::text
WHEN d.column_type =ANY('{timestamp,timestamptz}'::regtype[]) THEN _timescaledb_functions.to_interval(r.greatest_modified_value - r.lowest_modified_value)::text
END AS range
FROM _timescaledb_catalog.continuous_aggs_materialization_ranges r
JOIN _timescaledb_catalog.continuous_agg c ON c.mat_hypertable_id=r.materialization_id
JOIN _timescaledb_catalog.continuous_aggs_bucket_function f on f.mat_hypertable_id=c.mat_hypertable_id
JOIN _timescaledb_catalog.dimension d ON d.hypertable_id=c.mat_hypertable_id
WHERE
CASE
WHEN d.column_type =ANY('{int4,int8}'::regtype[]) THEN (r.greatest_modified_value - r.lowest_modified_value) > 250 * f.bucket_width::int
WHEN d.column_type =ANY('{timestamp,timestamptz}'::regtype[]) THEN _timescaledb_functions.to_interval(r.greatest_modified_value - r.lowest_modified_value) > 250 * f.bucket_width::interval
END
LOOP
RAISE WARNING 'Continuous aggregate % has large materialization range ''%''.', cagg, range;
END LOOP;
END
$$ SET search_path = pg_catalog, pg_temp;

CREATE OR REPLACE FUNCTION check_job_failures() RETURNS void LANGUAGE plpgsql AS
$$
DECLARE
Expand Down Expand Up @@ -119,6 +147,7 @@ BEGIN
PERFORM check_deprecated_features();
PERFORM check_job_failures();
PERFORM check_compressed_chunk_batch_sizes();
PERFORM check_cagg_large_materialization_range();
END
$$;

Expand Down