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Add check for cagg chunk width #57

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merged 1 commit into from
Nov 13, 2025
Merged

Add check for cagg chunk width #57

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38 changes: 34 additions & 4 deletions diagnostic.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -42,10 +42,10 @@ $$ SET search_path = pg_catalog, pg_temp;
CREATE OR REPLACE FUNCTION pg_temp.check_cagg_large_materialization_range() RETURNS void LANGUAGE plpgsql AS
$$
DECLARE
cagg regclass;
range text;
v_cagg regclass;
v_range text;
BEGIN
FOR cagg, range IN
FOR v_cagg, v_range IN
SELECT
format('%I.%I', c.user_view_schema, c.user_view_name)::regclass AS continuous_aggregate,
CASE
Expand All @@ -62,7 +62,36 @@ BEGIN
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;
RAISE WARNING 'Continuous aggregate % has large materialization range ''%''.', v_cagg, v_range;
END LOOP;
END
$$ SET search_path = pg_catalog, pg_temp;

CREATE OR REPLACE FUNCTION pg_temp.check_cagg_chunk_interval() RETURNS void LANGUAGE plpgsql AS
$$
DECLARE
v_cagg regclass;
v_cagg_width text;
v_chunk_width text;
BEGIN
FOR v_cagg, v_chunk_width, v_cagg_width IN
SELECT
format('%I.%I', c.user_view_schema, c.user_view_name)::regclass AS continuous_aggregate,
CASE
WHEN d.column_type =ANY('{int4,int8}'::regtype[]) THEN d.interval_length::text
WHEN d.column_type =ANY('{timestamp,timestamptz}'::regtype[]) THEN _timescaledb_functions.to_interval(d.interval_length)::text
END AS chunk_width,
f.bucket_width cagg_width
FROM _timescaledb_catalog.continuous_agg c
JOIN _timescaledb_catalog.continuous_aggs_bucket_function f ON f.mat_hypertable_id=c.mat_hypertable_id
JOIN _timescaledb_catalog.dimension d ON d.hypertable_id=c.mat_hypertable_id
WHERE
CASE
WHEN d.column_type =ANY('{int4,int8}'::regtype[]) THEN d.interval_length <= f.bucket_width::int
WHEN d.column_type =ANY('{timestamp,timestamptz}'::regtype[]) THEN _timescaledb_functions.to_interval(d.interval_length) <= f.bucket_width::interval
END
LOOP
RAISE WARNING 'Continuous aggregate % has chunk width smaller than bucket width % <= %', v_cagg, v_chunk_width, v_cagg_width;
END LOOP;
END
$$ SET search_path = pg_catalog, pg_temp;
Expand Down Expand Up @@ -169,6 +198,7 @@ BEGIN
PERFORM pg_temp.check_job_failures();
PERFORM pg_temp.check_compressed_chunk_batch_sizes();
PERFORM pg_temp.check_cagg_large_materialization_range();
PERFORM pg_temp.check_cagg_chunk_interval();
END
$$ SET search_path = pg_catalog, pg_temp;

Expand Down