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-- The python partitioning script now turns off autovacuum on the entire partition set while it is running. This should help reduce load since it will prevent the autovacuum daemon from kicking off while data is being migrated. When the script is done running, the default value for autovacuum is restored to all tables in the partition set. Also, VACUUM ANALYZE is run on the parent table when all data has finished moving as well. There is an option to disable the turning off of autovacuum if the ALTER TABLE statements are causing more contention and issues than the autovacuum. There is no option for turning off autovacuum when using the plpgsql partitioning functions (inability to COMMIT within function loop would cause too much contention).
-- The order that data is migrated from the parent to the children can now be determined via an option to the partition_data_id/time() functions or the python script. The default is the way it originally moved data (ascending order). Thanks for bougyman from #postgresql on freenode for this idea.
-- Removed plpgsql function "check_unique_column()" and created python script "check_unique_constraint.py". This runs far more efficiently and causes less contention within the database while checking if a unique constraint is consistent across all child tables. Also now supports checking multi-column constraints. See doc file for more info on script options.
-- Fixed syntax error in create_parent(), create_id_function() exception blocks. Reported by bougyman.
-- Added pgtap tests for additional constraints feature.
CREATE TEMP TABLE partman_preserve_privs_temp (statement text);
INSERT INTO partman_preserve_privs_temp
SELECT 'GRANT EXECUTE ON FUNCTION @extschema@.partition_data_id(text, int, int, numeric, text) TO '||array_to_string(array_agg(grantee::text), ',')||';'
FROM information_schema.routine_privileges
WHERE routine_schema = '@extschema@'
AND routine_name = 'partition_data_id';
INSERT INTO partman_preserve_privs_temp
SELECT 'GRANT EXECUTE ON FUNCTION @extschema@.partition_data_time(text, int, interval, numeric, text) TO '||array_to_string(array_agg(grantee::text), ',')||';'
FROM information_schema.routine_privileges
WHERE routine_schema = '@extschema@'
AND routine_name = 'partition_data_time';
DROP FUNCTION @extschema@.check_unique_column(text, text);
DROP TYPE @extschema@.check_unique_table;
DROP FUNCTION partition_data_id(text, int, int, numeric);
DROP FUNCTION partition_data_time(text, int, interval, numeric);
DROP FUNCTION IF EXISTS create_next_time_partition (text);
/*
* Populate the child table(s) of an id-based partition set with old data from the original parent
*/
CREATE FUNCTION partition_data_id(p_parent_table text, p_batch_count int DEFAULT 1, p_batch_interval int DEFAULT NULL, p_lock_wait numeric DEFAULT 0, p_order text DEFAULT 'ASC') RETURNS bigint
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_control text;
v_current_partition_name text;
v_lock_iter int := 1;
v_lock_obtained boolean := FALSE;
v_max_partition_id bigint;
v_min_partition_id bigint;
v_part_interval bigint;
v_partition_id bigint[];
v_rowcount bigint;
v_sql text;
v_start_control bigint;
v_total_rows bigint := 0;
v_type text;
BEGIN
SELECT type
, part_interval::bigint
, control
INTO v_type
, v_part_interval
, v_control
FROM @extschema@.part_config
WHERE parent_table = p_parent_table
AND (type = 'id-static' OR type = 'id-dynamic');
IF NOT FOUND THEN
RAISE EXCEPTION 'ERROR: no config found for %', p_parent_table;
END IF;
IF p_batch_interval IS NULL OR p_batch_interval > v_part_interval THEN
p_batch_interval := v_part_interval;
END IF;
FOR i IN 1..p_batch_count LOOP
IF p_order = 'ASC' THEN
EXECUTE 'SELECT min('||v_control||') FROM ONLY '||p_parent_table INTO v_start_control;
IF v_start_control IS NULL THEN
RETURN 0;
END IF;
v_min_partition_id = v_start_control - (v_start_control % v_part_interval);
v_partition_id := ARRAY[v_min_partition_id];
-- Check if custom batch interval overflows current partition maximum
IF (v_start_control + p_batch_interval) >= (v_min_partition_id + v_part_interval) THEN
v_max_partition_id := v_min_partition_id + v_part_interval;
ELSE
v_max_partition_id := v_start_control + p_batch_interval;
END IF;
ELSIF p_order = 'DESC' THEN
EXECUTE 'SELECT max('||v_control||') FROM ONLY '||p_parent_table INTO v_start_control;
IF v_start_control IS NULL THEN
RETURN 0;
END IF;
v_min_partition_id = v_start_control - (v_start_control % v_part_interval);
-- Must be greater than max value still in parent table since query below grabs < max
v_max_partition_id := v_min_partition_id + v_part_interval;
v_partition_id := ARRAY[v_min_partition_id];
-- Make sure minimum doesn't underflow current partition minimum
IF (v_start_control - p_batch_interval) >= v_min_partition_id THEN
v_min_partition_id = v_start_control - p_batch_interval;
END IF;
ELSE
RAISE EXCEPTION 'Invalid value for p_order. Must be ASC or DESC';
END IF;
-- do some locking with timeout, if required
IF p_lock_wait > 0 THEN
v_lock_iter := 0;
WHILE v_lock_iter <= 5 LOOP
v_lock_iter := v_lock_iter + 1;
BEGIN
v_sql := 'SELECT * FROM ONLY ' || p_parent_table ||
' WHERE '||v_control||' >= '||quote_literal(v_min_partition_id)||
' AND '||v_control||' < '||quote_literal(v_max_partition_id)
||' FOR UPDATE NOWAIT';
EXECUTE v_sql;
v_lock_obtained := TRUE;
EXCEPTION
WHEN lock_not_available THEN
PERFORM pg_sleep( p_lock_wait / 5.0 );
CONTINUE;
END;
EXIT WHEN v_lock_obtained;
END LOOP;
IF NOT v_lock_obtained THEN
RETURN -1;
END IF;
END IF;
v_current_partition_name := @extschema@.create_id_partition(p_parent_table, v_partition_id);
EXECUTE 'WITH partition_data AS (
DELETE FROM ONLY '||p_parent_table||' WHERE '||v_control||' >= '||v_min_partition_id||
' AND '||v_control||' < '||v_max_partition_id||' RETURNING *)
INSERT INTO '||v_current_partition_name||' SELECT * FROM partition_data';
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total_rows := v_total_rows + v_rowcount;
IF v_rowcount = 0 THEN
EXIT;
END IF;
END LOOP;
IF v_type = 'id-static' THEN
PERFORM @extschema@.create_id_function(p_parent_table);
END IF;
RETURN v_total_rows;
END
$$;
/*
* Populate the child table(s) of a time-based partition set with old data from the original parent
*/
CREATE FUNCTION partition_data_time(p_parent_table text, p_batch_count int DEFAULT 1, p_batch_interval interval DEFAULT NULL, p_lock_wait numeric DEFAULT 0, p_order text DEFAULT 'ASC') RETURNS bigint
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_control text;
v_datetime_string text;
v_current_partition_name text;
v_max_partition_timestamp timestamp;
v_last_partition text;
v_lock_iter int := 1;
v_lock_obtained boolean := FALSE;
v_min_partition_timestamp timestamp;
v_part_interval interval;
v_partition_timestamp timestamp[];
v_rowcount bigint;
v_sql text;
v_start_control timestamp;
v_time_position int;
v_total_rows bigint := 0;
v_type text;
BEGIN
SELECT type
, part_interval::interval
, control
, datetime_string
, last_partition
INTO v_type
, v_part_interval
, v_control
, v_datetime_string
, v_last_partition
FROM @extschema@.part_config
WHERE parent_table = p_parent_table
AND (type = 'time-static' OR type = 'time-dynamic' OR type = 'time-custom');
IF NOT FOUND THEN
RAISE EXCEPTION 'ERROR: no config found for %', p_parent_table;
END IF;
IF p_batch_interval IS NULL OR p_batch_interval > v_part_interval THEN
p_batch_interval := v_part_interval;
END IF;
FOR i IN 1..p_batch_count LOOP
IF p_order = 'ASC' THEN
EXECUTE 'SELECT min('||v_control||') FROM ONLY '||p_parent_table INTO v_start_control;
ELSIF p_order = 'DESC' THEN
EXECUTE 'SELECT max('||v_control||') FROM ONLY '||p_parent_table INTO v_start_control;
ELSE
RAISE EXCEPTION 'Invalid value for p_order. Must be ASC or DESC';
END IF;
IF v_start_control IS NULL THEN
RETURN 0;
END IF;
IF v_type = 'time-static' OR v_type = 'time-dynamic' THEN
CASE
WHEN v_part_interval = '15 mins' THEN
v_min_partition_timestamp := date_trunc('hour', v_start_control) +
'15min'::interval * floor(date_part('minute', v_start_control) / 15.0);
WHEN v_part_interval = '30 mins' THEN
v_min_partition_timestamp := date_trunc('hour', v_start_control) +
'30min'::interval * floor(date_part('minute', v_start_control) / 30.0);
WHEN v_part_interval = '1 hour' THEN
v_min_partition_timestamp := date_trunc('hour', v_start_control);
WHEN v_part_interval = '1 day' THEN
v_min_partition_timestamp := date_trunc('day', v_start_control);
WHEN v_part_interval = '1 week' THEN
v_min_partition_timestamp := date_trunc('week', v_start_control);
WHEN v_part_interval = '1 month' THEN
v_min_partition_timestamp := date_trunc('month', v_start_control);
WHEN v_part_interval = '3 months' THEN
v_min_partition_timestamp := date_trunc('quarter', v_start_control);
WHEN v_part_interval = '1 year' THEN
v_min_partition_timestamp := date_trunc('year', v_start_control);
END CASE;
ELSIF v_type = 'time-custom' THEN
-- Keep going backwards, checking if the time interval encompases the current v_start_control value
v_time_position := (length(v_last_partition) - position('p_' in reverse(v_last_partition))) + 2;
v_min_partition_timestamp := to_timestamp(substring(v_last_partition from v_time_position), v_datetime_string);
v_max_partition_timestamp := v_min_partition_timestamp + v_part_interval;
LOOP
IF v_start_control >= v_min_partition_timestamp AND v_start_control < v_max_partition_timestamp THEN
EXIT;
ELSE
v_max_partition_timestamp := v_min_partition_timestamp;
BEGIN
v_min_partition_timestamp := v_min_partition_timestamp - v_part_interval;
EXCEPTION WHEN datetime_field_overflow THEN
RAISE EXCEPTION 'Attempted partition time interval is outside PostgreSQL''s supported time range.
Unable to create partition with interval before timestamp % ', v_min_partition_interval;
END;
END IF;
END LOOP;
END IF;
v_partition_timestamp := ARRAY[v_min_partition_timestamp];
IF p_order = 'ASC' THEN
IF (v_start_control + p_batch_interval) >= (v_min_partition_timestamp + v_part_interval) THEN
v_max_partition_timestamp := v_min_partition_timestamp + v_part_interval;
ELSE
v_max_partition_timestamp := v_start_control + p_batch_interval;
END IF;
ELSIF p_order = 'DESC' THEN
-- Must be greater than max value still in parent table since query below grabs < max
v_max_partition_timestamp := v_min_partition_timestamp + v_part_interval;
-- Make sure minimum doesn't underflow current partition minimum
IF (v_start_control - p_batch_interval) >= v_min_partition_timestamp THEN
v_min_partition_timestamp = v_start_control - p_batch_interval;
END IF;
ELSE
RAISE EXCEPTION 'Invalid value for p_order. Must be ASC or DESC';
END IF;
-- do some locking with timeout, if required
IF p_lock_wait > 0 THEN
v_lock_iter := 0;
WHILE v_lock_iter <= 5 LOOP
v_lock_iter := v_lock_iter + 1;
BEGIN
v_sql := 'SELECT * FROM ONLY ' || p_parent_table ||
' WHERE '||v_control||' >= '||quote_literal(v_min_partition_timestamp)||
' AND '||v_control||' < '||quote_literal(v_max_partition_timestamp)
||' FOR UPDATE NOWAIT';
EXECUTE v_sql;
v_lock_obtained := TRUE;
EXCEPTION
WHEN lock_not_available THEN
PERFORM pg_sleep( p_lock_wait / 5.0 );
CONTINUE;
END;
EXIT WHEN v_lock_obtained;
END LOOP;
IF NOT v_lock_obtained THEN
RETURN -1;
END IF;
END IF;
v_current_partition_name := @extschema@.create_time_partition(p_parent_table, v_partition_timestamp);
EXECUTE 'WITH partition_data AS (
DELETE FROM ONLY '||p_parent_table||' WHERE '||v_control||' >= '||quote_literal(v_min_partition_timestamp)||
' AND '||v_control||' < '||quote_literal(v_max_partition_timestamp)||' RETURNING *)
INSERT INTO '||v_current_partition_name||' SELECT * FROM partition_data';
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total_rows := v_total_rows + v_rowcount;
IF v_rowcount = 0 THEN
EXIT;
END IF;
END LOOP;
IF v_type = 'time-static' THEN
PERFORM @extschema@.create_time_function(p_parent_table);
END IF;
RETURN v_total_rows;
END
$$;
/*
* Function to turn a table into the parent of a partition set
*/
CREATE OR REPLACE FUNCTION create_parent(
p_parent_table text
, p_control text
, p_type text
, p_interval text
, p_constraint_cols text[] DEFAULT NULL
, p_premake int DEFAULT 4
, p_start_partition text DEFAULT NULL
, p_jobmon boolean DEFAULT true
, p_debug boolean DEFAULT false)
RETURNS void
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_base_timestamp timestamp;
v_count int := 1;
v_datetime_string text;
v_id_interval bigint;
v_job_id bigint;
v_jobmon_schema text;
v_last_partition_name text;
v_old_search_path text;
v_partition_time timestamp;
v_partition_time_array timestamp[];
v_partition_id bigint[];
v_max bigint;
v_notnull boolean;
v_start_time timestamp;
v_starting_partition_id bigint;
v_step_id bigint;
v_step_overflow_id bigint;
v_tablename text;
v_time_interval interval;
BEGIN
IF position('.' in p_parent_table) = 0 THEN
RAISE EXCEPTION 'Parent table must be schema qualified';
END IF;
SELECT tablename INTO v_tablename FROM pg_tables WHERE schemaname || '.' || tablename = p_parent_table;
IF v_tablename IS NULL THEN
RAISE EXCEPTION 'Please create given parent table first: %', p_parent_table;
END IF;
SELECT attnotnull INTO v_notnull FROM pg_attribute WHERE attrelid = p_parent_table::regclass AND attname = p_control;
IF v_notnull = false OR v_notnull IS NULL THEN
RAISE EXCEPTION 'Control column (%) for parent table (%) must be NOT NULL', p_control, p_parent_table;
END IF;
IF NOT @extschema@.check_partition_type(p_type) THEN
RAISE EXCEPTION '% is not a valid partitioning type', p_type;
END IF;
IF p_type = 'time-custom' AND @extschema@.check_version('9.2.0') IS FALSE THEN
RAISE EXCEPTION 'The "time-custom" type requires a minimum PostgreSQL version of 9.2.0';
END IF;
EXECUTE 'LOCK TABLE '||p_parent_table||' IN ACCESS EXCLUSIVE MODE';
IF p_jobmon THEN
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
IF v_jobmon_schema IS NOT NULL THEN
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
END IF;
END IF;
IF v_jobmon_schema IS NOT NULL THEN
v_job_id := add_job('PARTMAN SETUP PARENT: '||p_parent_table);
v_step_id := add_step(v_job_id, 'Creating initial partitions on new parent table: '||p_parent_table);
END IF;
IF p_type = 'time-static' OR p_type = 'time-dynamic' OR p_type = 'time-custom' THEN
CASE
WHEN p_interval = 'yearly' THEN
v_time_interval := '1 year';
WHEN p_interval = 'quarterly' THEN
v_time_interval := '3 months';
WHEN p_interval = 'monthly' THEN
v_time_interval := '1 month';
WHEN p_interval = 'weekly' THEN
v_time_interval := '1 week';
WHEN p_interval = 'daily' THEN
v_time_interval := '1 day';
WHEN p_interval = 'hourly' THEN
v_time_interval := '1 hour';
WHEN p_interval = 'half-hour' THEN
v_time_interval := '30 mins';
WHEN p_interval = 'quarter-hour' THEN
v_time_interval := '15 mins';
ELSE
IF p_type <> 'time-custom' THEN
RAISE EXCEPTION 'Must use a predefined time interval if not using type "time-custom". See documentation.';
END IF;
v_time_interval := p_interval::interval;
IF v_time_interval < '1 second'::interval THEN
RAISE EXCEPTION 'Partitioning interval must be 1 second or greater';
END IF;
END CASE;
-- First partition is either the min premake or p_start_partition
v_start_time := COALESCE(p_start_partition::timestamp, CURRENT_TIMESTAMP - (v_time_interval * p_premake));
IF v_time_interval >= '1 year' THEN
v_base_timestamp := date_trunc('year', v_start_time);
IF v_time_interval >= '10 years' THEN
v_base_timestamp := date_trunc('decade', v_start_time);
IF v_time_interval >= '100 years' THEN
v_base_timestamp := date_trunc('century', v_start_time);
IF v_time_interval >= '1000 years' THEN
v_base_timestamp := date_trunc('millennium', v_start_time);
END IF; -- 1000
END IF; -- 100
END IF; -- 10
END IF; -- 1
v_datetime_string := 'YYYY';
IF v_time_interval < '1 year' THEN
IF p_interval = 'quarterly' THEN
v_base_timestamp := date_trunc('quarter', v_start_time);
v_datetime_string = 'YYYY"q"Q';
ELSE
v_base_timestamp := date_trunc('month', v_start_time);
v_datetime_string := v_datetime_string || '_MM';
END IF;
IF v_time_interval < '1 month' THEN
IF p_interval = 'weekly' THEN
v_base_timestamp := date_trunc('week', v_start_time);
v_datetime_string := 'IYYY"w"IW';
ELSE
v_base_timestamp := date_trunc('day', v_start_time);
v_datetime_string := v_datetime_string || '_DD';
END IF;
IF v_time_interval < '1 day' THEN
v_base_timestamp := date_trunc('hour', v_start_time);
v_datetime_string := v_datetime_string || '_HH24MI';
IF v_time_interval < '1 minute' THEN
v_base_timestamp := date_trunc('minute', v_start_time);
v_datetime_string := v_datetime_string || 'SS';
END IF; -- minute
END IF; -- day
END IF; -- month
END IF; -- year
v_partition_time_array := array_append(v_partition_time_array, v_base_timestamp);
LOOP
-- If current loop value is less than or equal to the value of the max premake, add time to array.
IF (v_base_timestamp + (v_time_interval * v_count)) < (CURRENT_TIMESTAMP + (v_time_interval * p_premake)) THEN
BEGIN
v_partition_time := (v_base_timestamp + (v_time_interval * v_count))::timestamp;
v_partition_time_array := array_append(v_partition_time_array, v_partition_time);
EXCEPTION WHEN datetime_field_overflow THEN
RAISE WARNING 'Attempted partition time interval is outside PostgreSQL''s supported time range.
Child partition creation after time % skipped', v_partition_time;
v_step_overflow_id := add_step(v_job_id, 'Attempted partition time interval is outside PostgreSQL''s supported time range.');
PERFORM update_step(v_step_overflow_id, 'CRITICAL', 'Child partition creation after time '||v_partition_time||' skipped');
CONTINUE;
END;
ELSE
EXIT; -- all needed partitions added to array. Exit the loop.
END IF;
v_count := v_count + 1;
END LOOP;
INSERT INTO @extschema@.part_config (parent_table, type, part_interval, control, premake, constraint_cols, datetime_string, jobmon) VALUES
(p_parent_table, p_type, v_time_interval, p_control, p_premake, p_constraint_cols, v_datetime_string, p_jobmon);
v_last_partition_name := @extschema@.create_time_partition(p_parent_table, v_partition_time_array);
-- Doing separate update because create function requires in config table last_partition to be set
UPDATE @extschema@.part_config SET last_partition = v_last_partition_name WHERE parent_table = p_parent_table;
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Time partitions premade: '||p_premake);
END IF;
END IF;
IF p_type = 'id-static' OR p_type = 'id-dynamic' THEN
v_id_interval := p_interval::bigint;
IF v_id_interval <= 1 THEN
RAISE EXCEPTION 'Interval for serial partitioning must be greater than 1';
END IF;
-- If custom start partition is set, use that.
-- If custom start is not set and there is already data, start partitioning with the highest current value
EXECUTE 'SELECT COALESCE('||quote_nullable(p_start_partition::bigint)||', max('||p_control||')::bigint, 0) FROM '||p_parent_table||' LIMIT 1' INTO v_max;
v_starting_partition_id := v_max - (v_max % v_id_interval);
FOR i IN 0..p_premake LOOP
-- Only make previous partitions if ID value is less than the starting value and positive (and custom start partition wasn't set)
IF p_start_partition IS NULL AND
(v_starting_partition_id - (v_id_interval*i)) > 0
AND (v_starting_partition_id - (v_id_interval*i)) < v_starting_partition_id
THEN
v_partition_id = array_append(v_partition_id, (v_starting_partition_id - v_id_interval*i));
END IF;
v_partition_id = array_append(v_partition_id, (v_id_interval*i) + v_starting_partition_id);
END LOOP;
INSERT INTO @extschema@.part_config (parent_table, type, part_interval, control, premake, constraint_cols, jobmon) VALUES
(p_parent_table, p_type, v_id_interval, p_control, p_premake, p_constraint_cols, p_jobmon);
v_last_partition_name := @extschema@.create_id_partition(p_parent_table, v_partition_id);
-- Doing separate update because create function needs parent table in config table for apply_grants()
UPDATE @extschema@.part_config SET last_partition = v_last_partition_name WHERE parent_table = p_parent_table;
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'ID partitions premade: '||p_premake);
END IF;
END IF;
IF v_jobmon_schema IS NOT NULL THEN
v_step_id := add_step(v_job_id, 'Creating partition function');
END IF;
IF p_type = 'time-static' OR p_type = 'time-dynamic' OR p_type = 'time-custom' THEN
PERFORM @extschema@.create_time_function(p_parent_table);
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Time function created');
END IF;
ELSIF p_type = 'id-static' OR p_type = 'id-dynamic' THEN
PERFORM @extschema@.create_id_function(p_parent_table);
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'ID function created');
END IF;
END IF;
IF v_jobmon_schema IS NOT NULL THEN
v_step_id := add_step(v_job_id, 'Creating partition trigger');
END IF;
PERFORM @extschema@.create_trigger(p_parent_table);
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Done');
IF v_step_overflow_id IS NOT NULL THEN
PERFORM fail_job(v_job_id);
ELSE
PERFORM close_job(v_job_id);
END IF;
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;
EXCEPTION
WHEN OTHERS THEN
IF v_jobmon_schema IS NOT NULL THEN
IF v_job_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_job(''PARTMAN CREATE PARENT: '||p_parent_table||''')' INTO v_job_id;
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''Partition creation for table '||p_parent_table||' failed'')' INTO v_step_id;
ELSIF v_step_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before first step logged'')' INTO v_step_id;
END IF;
EXECUTE 'SELECT '||v_jobmon_schema||'.update_step('||v_step_id||', ''CRITICAL'', ''ERROR: '||coalesce(SQLERRM,'unknown')||''')';
EXECUTE 'SELECT '||v_jobmon_schema||'.fail_job('||v_job_id||')';
END IF;
RAISE EXCEPTION '%', SQLERRM;
END
$$;
/*
* Create the trigger function for the parent table of an id-based partition set
*/
CREATE OR REPLACE FUNCTION create_id_function(p_parent_table text) RETURNS void
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_control text;
v_count int;
v_current_partition_name text;
v_current_partition_id bigint;
v_datetime_string text;
v_final_partition_id bigint;
v_function_name text;
v_job_id bigint;
v_jobmon text;
v_jobmon_schema text;
v_last_partition text;
v_max bigint;
v_next_partition_id bigint;
v_next_partition_name text;
v_old_search_path text;
v_parent_schema text;
v_parent_tablename text;
v_part_interval bigint;
v_premake int;
v_prev_partition_id bigint;
v_prev_partition_name text;
v_step_id bigint;
v_trig_func text;
v_type text;
BEGIN
SELECT type
, part_interval::bigint
, control
, premake
, last_partition
, jobmon
INTO v_type
, v_part_interval
, v_control
, v_premake
, v_last_partition
, v_jobmon
FROM @extschema@.part_config
WHERE parent_table = p_parent_table
AND (type = 'id-static' OR type = 'id-dynamic');
IF NOT FOUND THEN
RAISE EXCEPTION 'ERROR: no config found for %', p_parent_table;
END IF;
IF v_jobmon THEN
SELECT nspname INTO v_jobmon_schema FROM pg_catalog.pg_namespace n, pg_catalog.pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
IF v_jobmon_schema IS NOT NULL THEN
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
END IF;
END IF;
IF v_jobmon_schema IS NOT NULL THEN
v_job_id := add_job('PARTMAN CREATE FUNCTION: '||p_parent_table);
v_step_id := add_step(v_job_id, 'Creating partition function for table '||p_parent_table);
END IF;
SELECT schemaname, tablename INTO v_parent_schema, v_parent_tablename FROM pg_catalog.pg_tables WHERE schemaname ||'.'|| tablename = p_parent_table;
v_function_name := @extschema@.check_name_length(v_parent_tablename, v_parent_schema, '_part_trig_func', FALSE);
IF v_type = 'id-static' THEN
EXECUTE 'SELECT COALESCE(max('||v_control||'), 0) FROM '||p_parent_table INTO v_max;
v_current_partition_id = v_max - (v_max % v_part_interval);
v_next_partition_id := v_current_partition_id + v_part_interval;
v_current_partition_name := @extschema@.check_name_length(v_parent_tablename, v_parent_schema, v_current_partition_id::text, TRUE);
v_trig_func := 'CREATE OR REPLACE FUNCTION '||v_function_name||'() RETURNS trigger LANGUAGE plpgsql AS $t$
DECLARE
v_current_partition_id bigint;
v_last_partition text := '||quote_literal(v_last_partition)||';
v_id_position int;
v_next_partition_id bigint;
v_next_partition_name text;
BEGIN
IF TG_OP = ''INSERT'' THEN
IF NEW.'||v_control||' >= '||v_current_partition_id||' AND NEW.'||v_control||' < '||v_next_partition_id|| ' THEN
INSERT INTO '||v_current_partition_name||' VALUES (NEW.*); ';
FOR i IN 1..v_premake LOOP
v_prev_partition_id := v_current_partition_id - (v_part_interval * i);
v_next_partition_id := v_current_partition_id + (v_part_interval * i);
v_final_partition_id := v_next_partition_id + v_part_interval;
v_prev_partition_name := @extschema@.check_name_length(v_parent_tablename, v_parent_schema, v_prev_partition_id::text, TRUE);
v_next_partition_name := @extschema@.check_name_length(v_parent_tablename, v_parent_schema, v_next_partition_id::text, TRUE);
-- Check that child table exist before making a rule to insert to them.
-- Handles edge case of changing premake immediately after running create_parent().
SELECT count(*) INTO v_count FROM pg_catalog.pg_tables WHERE schemaname ||'.'||tablename = v_prev_partition_name;
IF v_count > 0 THEN
-- Only handle previous partitions if they're starting above zero
IF v_prev_partition_id >= 0 THEN
v_trig_func := v_trig_func ||'
ELSIF NEW.'||v_control||' >= '||v_prev_partition_id||' AND NEW.'||v_control||' < '||v_prev_partition_id + v_part_interval|| ' THEN
INSERT INTO '||v_prev_partition_name||' VALUES (NEW.*); ';
END IF;
END IF;
SELECT count(*) INTO v_count FROM pg_catalog.pg_tables WHERE schemaname ||'.'||tablename = v_next_partition_name;
IF v_count > 0 THEN
v_trig_func := v_trig_func ||'
ELSIF NEW.'||v_control||' >= '||v_next_partition_id||' AND NEW.'||v_control||' < '||v_final_partition_id|| ' THEN
INSERT INTO '||v_next_partition_name||' VALUES (NEW.*); ';
END IF;
END LOOP;
v_trig_func := v_trig_func ||'
ELSE
RETURN NEW;
END IF;
v_current_partition_id := NEW.'||v_control||' - (NEW.'||v_control||' % '||v_part_interval||');
IF (NEW.'||v_control||' % '||v_part_interval||') > ('||v_part_interval||' / 2) THEN
v_id_position := (length(v_last_partition) - position(''p_'' in reverse(v_last_partition))) + 2;
v_next_partition_id := (substring(v_last_partition from v_id_position)::bigint) + '||v_part_interval||';
WHILE ((v_next_partition_id - v_current_partition_id) / '||v_part_interval||') <= '||v_premake||' LOOP
v_next_partition_name := @extschema@.create_id_partition('||quote_literal(p_parent_table)||', ARRAY[v_next_partition_id]);
UPDATE @extschema@.part_config SET last_partition = v_next_partition_name WHERE parent_table = '||quote_literal(p_parent_table)||';
PERFORM @extschema@.create_id_function('||quote_literal(p_parent_table)||');
PERFORM @extschema@.apply_constraints('||quote_literal(p_parent_table)||');
v_next_partition_id := v_next_partition_id + '||v_part_interval||';
END LOOP;
END IF;
END IF;
RETURN NULL;
END $t$;';
EXECUTE v_trig_func;
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Added function for current id interval: '||v_current_partition_id||' to '||v_final_partition_id-1);
END IF;
ELSIF v_type = 'id-dynamic' THEN
-- The return inside the partition creation check is there to keep really high ID values from creating new partitions.
v_trig_func := 'CREATE OR REPLACE FUNCTION '||v_function_name||'() RETURNS trigger LANGUAGE plpgsql AS $t$
DECLARE
v_count int;
v_current_partition_id bigint;
v_current_partition_name text;
v_id_position int;
v_last_partition text := '||quote_literal(v_last_partition)||';
v_last_partition_id bigint;
v_next_partition_id bigint;
v_next_partition_name text;
BEGIN
IF TG_OP = ''INSERT'' THEN
v_current_partition_id := NEW.'||v_control||' - (NEW.'||v_control||' % '||v_part_interval||');
v_current_partition_name := @extschema@.check_name_length('''||v_parent_tablename||''', '''||v_parent_schema||''', v_current_partition_id::text, TRUE);
IF (NEW.'||v_control||' % '||v_part_interval||') > ('||v_part_interval||' / 2) THEN
v_id_position := (length(v_last_partition) - position(''p_'' in reverse(v_last_partition))) + 2;
v_last_partition_id = substring(v_last_partition from v_id_position)::bigint;
v_next_partition_id := v_last_partition_id + '||v_part_interval||';
IF NEW.'||v_control||' >= v_next_partition_id THEN
RETURN NEW;
END IF;
WHILE ((v_next_partition_id - v_current_partition_id) / '||v_part_interval||') <= '||v_premake||' LOOP
v_next_partition_name := @extschema@.create_id_partition('||quote_literal(p_parent_table)||', ARRAY[v_next_partition_id]);
IF v_next_partition_name IS NOT NULL THEN
UPDATE @extschema@.part_config SET last_partition = v_next_partition_name WHERE parent_table = '||quote_literal(p_parent_table)||';
PERFORM @extschema@.create_id_function('||quote_literal(p_parent_table)||');
PERFORM @extschema@.apply_constraints('||quote_literal(p_parent_table)||');
END IF;
v_next_partition_id := v_next_partition_id + '||v_part_interval||';
END LOOP;
END IF;
SELECT count(*) INTO v_count FROM pg_tables WHERE schemaname ||''.''|| tablename = v_current_partition_name;
IF v_count > 0 THEN
EXECUTE ''INSERT INTO ''||v_current_partition_name||'' VALUES($1.*)'' USING NEW;
ELSE
RETURN NEW;
END IF;
END IF;
RETURN NULL;
END $t$;';
EXECUTE v_trig_func;
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Added function for dynamic id table: '||p_parent_table);
END IF;
ELSE
RAISE EXCEPTION 'ERROR: Invalid id partitioning type given: %', v_type;
END IF;
IF v_jobmon_schema IS NOT NULL THEN
PERFORM close_job(v_job_id);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;
EXCEPTION
WHEN OTHERS THEN
IF v_jobmon_schema IS NOT NULL THEN
IF v_job_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_job(''PARTMAN CREATE FUNCTION: '||p_parent_table||''')' INTO v_job_id;
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''Partition function maintenance for table '||p_parent_table||' failed'')' INTO v_step_id;
ELSIF v_step_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before first step logged'')' INTO v_step_id;
END IF;
EXECUTE 'SELECT '||v_jobmon_schema||'.update_step('||v_step_id||', ''CRITICAL'', ''ERROR: '||coalesce(SQLERRM,'unknown')||''')';
EXECUTE 'SELECT '||v_jobmon_schema||'.fail_job('||v_job_id||')';
END IF;
RAISE EXCEPTION '%', SQLERRM;
END
$$;
/*
* Function to undo partitioning.
* Will actually work on any parent/child table set, not just ones created by pg_partman.
*/
CREATE OR REPLACE FUNCTION undo_partition(p_parent_table text, p_batch_count int DEFAULT 1, p_keep_table boolean DEFAULT true, p_jobmon boolean DEFAULT true) RETURNS bigint
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_adv_lock boolean;
v_batch_loop_count bigint := 0;
v_child_count bigint;
v_child_table text;
v_copy_sql text;
v_function_name text;
v_job_id bigint;
v_jobmon_schema text;
v_old_search_path text;
v_parent_schema text;
v_parent_tablename text;
v_part_interval interval;
v_rowcount bigint;
v_step_id bigint;
v_total bigint := 0;
v_trig_name text;
v_undo_count int := 0;
BEGIN
v_adv_lock := pg_try_advisory_xact_lock(hashtext('pg_partman undo_partition'));
IF v_adv_lock = 'false' THEN
RAISE NOTICE 'undo_partition already running.';
RETURN 0;
END IF;
IF p_jobmon THEN
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
IF v_jobmon_schema IS NOT NULL THEN
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
END IF;
END IF;
IF v_jobmon_schema IS NOT NULL THEN
v_job_id := add_job('PARTMAN UNDO PARTITIONING: '||p_parent_table);
v_step_id := add_step(v_job_id, 'Undoing partitioning for table '||p_parent_table);
END IF;
-- Stops new time partitons from being made as well as stopping child tables from being dropped if they were configured with a retention period.
UPDATE @extschema@.part_config SET undo_in_progress = true WHERE parent_table = p_parent_table;
-- Stop data going into child tables and stop new id partitions from being made.
SELECT schemaname, tablename INTO v_parent_schema, v_parent_tablename FROM pg_tables WHERE schemaname ||'.'|| tablename = p_parent_table;
v_trig_name := @extschema@.check_name_length(p_object_name := v_parent_tablename, p_suffix := '_part_trig');
v_function_name := @extschema@.check_name_length(v_parent_tablename, v_parent_schema, '_part_trig_func', FALSE);
EXECUTE 'DROP TRIGGER IF EXISTS '||v_trig_name||' ON '||p_parent_table;
EXECUTE 'DROP FUNCTION IF EXISTS '||v_function_name||'()';
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Stopped partition creation process. Removed trigger & trigger function');
END IF;
WHILE v_batch_loop_count < p_batch_count LOOP
SELECT n.nspname||'.'||c.relname INTO v_child_table
FROM pg_inherits i
JOIN pg_class c ON i.inhrelid = c.oid
JOIN pg_namespace n ON c.relnamespace = n.oid
WHERE i.inhparent::regclass = p_parent_table::regclass
ORDER BY i.inhrelid ASC;
EXIT WHEN v_child_table IS NULL;
EXECUTE 'SELECT count(*) FROM '||v_child_table INTO v_child_count;
IF v_child_count = 0 THEN
-- No rows left in this child table. Remove from partition set.
EXECUTE 'ALTER TABLE '||v_child_table||' NO INHERIT ' || p_parent_table;
IF p_keep_table = false THEN
EXECUTE 'DROP TABLE '||v_child_table;
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Child table DROPPED. Moved '||coalesce(v_rowcount, 0)||' rows to parent');
END IF;
ELSE
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Child table UNINHERITED, not DROPPED. Copied '||coalesce(v_rowcount, 0)||' rows to parent');
END IF;
END IF;
v_undo_count := v_undo_count + 1;
CONTINUE;
END IF;
IF v_jobmon_schema IS NOT NULL THEN
v_step_id := add_step(v_job_id, 'Removing child partition: '||v_child_table);
END IF;
v_copy_sql := 'INSERT INTO '||p_parent_table||' SELECT * FROM '||v_child_table;
EXECUTE v_copy_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total := v_total + v_rowcount;
EXECUTE 'ALTER TABLE '||v_child_table||' NO INHERIT ' || p_parent_table;
IF p_keep_table = false THEN
EXECUTE 'DROP TABLE '||v_child_table;
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Child table DROPPED. Moved '||v_rowcount||' rows to parent');
END IF;
ELSE
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Child table UNINHERITED, not DROPPED. Copied '||v_rowcount||' rows to parent');
END IF;
END IF;
v_batch_loop_count := v_batch_loop_count + 1;
v_undo_count := v_undo_count + 1;
END LOOP;
IF v_undo_count = 0 THEN
-- FOR loop never ran, so there's no child tables left.
DELETE FROM @extschema@.part_config WHERE parent_table = p_parent_table;
IF v_jobmon_schema IS NOT NULL THEN
v_step_id := add_step(v_job_id, 'Removing config from pg_partman (if it existed)');
PERFORM update_step(v_step_id, 'OK', 'Done');
END IF;
END IF;
RAISE NOTICE 'Copied % row(s) from % child table(s) to the parent: %', v_total, v_undo_count, p_parent_table;
IF v_jobmon_schema IS NOT NULL THEN
v_step_id := add_step(v_job_id, 'Final stats');
PERFORM update_step(v_step_id, 'OK', 'Copied '||v_total||' row(s) from '||v_undo_count||' child table(s) to the parent');
END IF;
IF v_jobmon_schema IS NOT NULL THEN
PERFORM close_job(v_job_id);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;
RETURN v_total;
EXCEPTION
WHEN OTHERS THEN
IF v_jobmon_schema IS NOT NULL THEN
IF v_job_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_job(''PARTMAN UNDO PARTITIONING: '||p_parent_table||''')' INTO v_job_id;
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''Partition function maintenance for table '||p_parent_table||' failed'')' INTO v_step_id;
ELSIF v_step_id IS NULL THEN
EXECUTE 'SELECT '||v_jobmon_schema||'.add_step('||v_job_id||', ''EXCEPTION before first step logged'')' INTO v_step_id;
END IF;
EXECUTE 'SELECT '||v_jobmon_schema||'.update_step('||v_step_id||', ''CRITICAL'', ''ERROR: '||coalesce(SQLERRM,'unknown')||''')';
EXECUTE 'SELECT '||v_jobmon_schema||'.fail_job('||v_job_id||')';
END IF;
RAISE EXCEPTION '%', SQLERRM;
END
$$;
DO $$
DECLARE
v_row record;
BEGIN
FOR v_row IN SELECT statement FROM partman_preserve_privs_temp LOOP
IF v_row.statement IS NOT NULL THEN
EXECUTE v_row.statement;
END IF;
END LOOP;
END
$$;
DROP TABLE partman_preserve_privs_temp;
|