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# frozen_string_literal: true
class FixViewForPerTableAutovacuumStatus < Gitlab::Database::Migration[2.0]
def up
execute <<~SQL
DROP VIEW IF EXISTS postgres_autovacuum_activity;
DROP FUNCTION IF EXISTS postgres_pg_stat_activity_autovacuum;
CREATE FUNCTION postgres_pg_stat_activity_autovacuum() RETURNS TABLE(query text, query_start timestamptz) AS
$$
SELECT query, query_start
FROM pg_stat_activity
WHERE datname = current_database()
AND state = 'active'
AND backend_type = 'autovacuum worker'
$$
LANGUAGE sql
VOLATILE
SECURITY DEFINER
SET search_path = 'pg_catalog', 'pg_temp';
CREATE VIEW postgres_autovacuum_activity AS
WITH processes as
(
SELECT query, query_start, (regexp_matches(query, '^autovacuum: VACUUM (\w+)\.(\w+)')) as matches
FROM postgres_pg_stat_activity_autovacuum()
WHERE query ~* '^autovacuum: VACUUM \w+\.\w+'
)
SELECT matches[1] || '.' || matches[2] as table_identifier,
matches[1] as schema,
matches[2] as table,
query_start as vacuum_start
FROM processes;
COMMENT ON VIEW postgres_autovacuum_activity IS 'Contains information about PostgreSQL backends currently performing autovacuum operations on the tables indicated here.';
SQL
end
def down
execute(<<~SQL)
DROP VIEW IF EXISTS postgres_autovacuum_activity;
DROP FUNCTION IF EXISTS postgres_pg_stat_activity_autovacuum;
CREATE FUNCTION postgres_pg_stat_activity_autovacuum() RETURNS SETOF pg_catalog.pg_stat_activity AS
$$
SELECT *
FROM pg_stat_activity
WHERE datname = current_database()
AND state = 'active'
AND backend_type = 'autovacuum worker'
$$
LANGUAGE sql
VOLATILE
SECURITY DEFINER
SET search_path = 'pg_catalog', 'pg_temp';
CREATE VIEW postgres_autovacuum_activity AS
WITH processes as
(
SELECT query, query_start, (regexp_matches(query, '^autovacuum: VACUUM (\w+)\.(\w+)')) as matches
FROM postgres_pg_stat_activity_autovacuum()
WHERE query ~* '^autovacuum: VACUUM \w+\.\w+'
)
SELECT matches[1] || '.' || matches[2] as table_identifier,
matches[1] as schema,
matches[2] as table,
query_start as vacuum_start
FROM processes;
COMMENT ON VIEW postgres_autovacuum_activity IS 'Contains information about PostgreSQL backends currently performing autovacuum operations on the tables indicated here.';
SQL
end
end
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