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-- New python scripts in extras folder to allow partition creation and undoing using smaller commit batches, as is suggested in the documentation for the partition_data_* and undo_partition_* functions. This helps avoid transaction locks when there is a large amount of data to move around. There are also options to commit more slowly and ease the load on very busy systems.
-- Changed the ordering of batch arguments in partition_data_id() & partition_data_time(). This makes their order the same as the undo functions and is a more sensical order (I think anyway).
-- Made partition functions quieter. No more notices and just returns number of rows moved.
-- Changed the undo partition functions to remove partitions in the order they were originally created. They were doing it alphabetically before, which could cause an odd order for serial based partitioning (p100 would be before p2). Creation order may not remove them in ascending order of the data at first, which would be ideal, but it makes more sense than alphabetically.
-- Bug fix: undo_partition() could return 0 prematurely if some of the partitions were empty. Will now automatically uninherit/drop any empty partitions and continue on if there are still child tables, not counting them against p_batch_count if given.
DROP FUNCTION @extschema@.partition_data_id(text, int, int);
DROP FUNCTION @extschema@.partition_data_time(text, interval, int);
/*
* 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) RETURNS bigint
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_control text;
v_last_partition_name text;
v_max_partition_id bigint;
v_min_control bigint;
v_min_partition_id bigint;
v_part_interval bigint;
v_partition_id bigint[];
v_rowcount bigint;
v_sql text;
v_total_rows bigint := 0;
BEGIN
SELECT part_interval::bigint, control
INTO v_part_interval, v_control
FROM @extschema@.part_config
WHERE parent_table = p_parent_table
AND (type = 'id-static' OR type = 'id-dynamic');
IF NOT FOUND THEN
RAISE EXCEPTION 'ERROR: no config found for %', p_parent_table;
END IF;
IF p_batch_interval IS NULL OR p_batch_interval > v_part_interval THEN
p_batch_interval := v_part_interval;
END IF;
FOR i IN 1..p_batch_count LOOP
EXECUTE 'SELECT min('||v_control||') FROM ONLY '||p_parent_table INTO v_min_control;
IF v_min_control IS NULL THEN
RETURN 0;
END IF;
v_min_partition_id = v_min_control - (v_min_control % v_part_interval);
v_partition_id := ARRAY[v_min_partition_id];
-- RAISE NOTICE 'v_partition_id: %',v_partition_id;
IF (v_min_control + p_batch_interval) >= (v_min_partition_id + v_part_interval) THEN
v_max_partition_id := v_min_partition_id + v_part_interval;
ELSE
v_max_partition_id := v_min_control + p_batch_interval;
END IF;
-- RAISE NOTICE 'v_max_partition_id: %',v_max_partition_id;
v_sql := 'SELECT @extschema@.create_id_partition('||quote_literal(p_parent_table)||','||quote_literal(v_control)||','
||v_part_interval||','||quote_literal(v_partition_id)||')';
-- RAISE NOTICE 'v_sql: %', v_sql;
EXECUTE v_sql INTO v_last_partition_name;
v_sql := 'WITH partition_data AS (
DELETE FROM ONLY '||p_parent_table||' WHERE '||v_control||' >= '||v_min_control||
' AND '||v_control||' < '||v_max_partition_id||' RETURNING *)
INSERT INTO '||v_last_partition_name||' SELECT * FROM partition_data';
-- RAISE NOTICE 'v_sql: %', v_sql;
EXECUTE v_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total_rows := v_total_rows + v_rowcount;
IF v_rowcount = 0 THEN
EXIT;
END IF;
END LOOP;
RETURN v_total_rows;
END
$$;
/*
* 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) RETURNS bigint
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_control text;
v_datetime_string text;
v_last_partition_name text;
v_max_partition_timestamp timestamp;
v_min_control timestamp;
v_min_partition_timestamp timestamp;
v_part_interval interval;
v_partition_timestamp timestamp[];
v_rowcount bigint;
v_sql text;
v_total_rows bigint := 0;
BEGIN
SELECT part_interval::interval, control, datetime_string
INTO v_part_interval, v_control, v_datetime_string
FROM @extschema@.part_config
WHERE parent_table = p_parent_table
AND (type = 'time-static' OR type = 'time-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
EXECUTE 'SELECT min('||v_control||') FROM ONLY '||p_parent_table INTO v_min_control;
IF v_min_control IS NULL THEN
RETURN 0;
END IF;
CASE
WHEN v_part_interval = '15 mins' THEN
v_min_partition_timestamp := date_trunc('hour', v_min_control) +
'15min'::interval * floor(date_part('minute', v_min_control) / 15.0);
WHEN v_part_interval = '30 mins' THEN
v_min_partition_timestamp := date_trunc('hour', v_min_control) +
'30min'::interval * floor(date_part('minute', v_min_control) / 30.0);
WHEN v_part_interval = '1 hour' THEN
v_min_partition_timestamp := date_trunc('hour', v_min_control);
WHEN v_part_interval = '1 day' THEN
v_min_partition_timestamp := date_trunc('day', v_min_control);
WHEN v_part_interval = '1 week' THEN
v_min_partition_timestamp := date_trunc('week', v_min_control);
WHEN v_part_interval = '1 month' THEN
v_min_partition_timestamp := date_trunc('month', v_min_control);
WHEN v_part_interval = '3 months' THEN
v_min_partition_timestamp := date_trunc('quarter', v_min_control);
WHEN v_part_interval = '1 year' THEN
v_min_partition_timestamp := date_trunc('year', v_min_control);
END CASE;
v_partition_timestamp := ARRAY[v_min_partition_timestamp];
-- RAISE NOTICE 'v_partition_timestamp: %',v_partition_timestamp;
IF (v_min_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_min_control + p_batch_interval;
END IF;
-- RAISE NOTICE 'v_max_partition_timestamp: %',v_max_partition_timestamp;
v_sql := 'SELECT @extschema@.create_time_partition('||quote_literal(p_parent_table)||','||quote_literal(v_control)||','
||quote_literal(v_part_interval)||','||quote_literal(v_datetime_string)||','||quote_literal(v_partition_timestamp)||')';
-- RAISE NOTICE 'v_sql: %', v_sql;
EXECUTE v_sql INTO v_last_partition_name;
v_sql := 'WITH partition_data AS (
DELETE FROM ONLY '||p_parent_table||' WHERE '||v_control||' >= '||quote_literal(v_min_control)||
' AND '||v_control||' < '||quote_literal(v_max_partition_timestamp)||' RETURNING *)
INSERT INTO '||v_last_partition_name||' SELECT * FROM partition_data';
-- RAISE NOTICE 'v_sql: %', v_sql;
EXECUTE v_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total_rows := v_total_rows + v_rowcount;
IF v_rowcount = 0 THEN
EXIT;
END IF;
END LOOP;
RETURN v_total_rows;
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) 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_job_id bigint;
v_jobmon_schema text;
v_old_search_path text;
v_part_interval interval;
v_rowcount bigint;
v_step_id bigint;
v_tablename text;
v_total bigint := 0;
v_undo_count int := 0;
BEGIN
v_adv_lock := pg_try_advisory_lock(hashtext('pg_partman undo_partition'));
IF v_adv_lock = 'false' THEN
RAISE NOTICE 'undo_partition already running.';
RETURN 0;
END IF;
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;
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.
v_tablename := substring(p_parent_table from position('.' in p_parent_table)+1);
EXECUTE 'DROP TRIGGER IF EXISTS '||v_tablename||'_part_trig ON '||p_parent_table;
EXECUTE 'DROP FUNCTION IF EXISTS '||p_parent_table||'_part_trig_func()';
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 inhrelid::regclass INTO v_child_table
FROM pg_catalog.pg_inherits
WHERE inhparent::regclass = p_parent_table::regclass
ORDER BY 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;
PERFORM pg_advisory_unlock(hashtext('pg_partman undo_partition'));
RETURN v_total;
EXCEPTION
WHEN OTHERS THEN
IF v_jobmon_schema IS NOT NULL THEN
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
IF v_job_id IS NULL THEN
v_job_id := add_job('PARTMAN UNDO PARTITIONING: '||p_parent_table);
v_step_id := add_step(v_job_id, 'Partition function maintenance for table '||p_parent_table||' failed');
ELSIF v_step_id IS NULL THEN
v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
END IF;
PERFORM update_step(v_step_id, 'CRITICAL', 'ERROR: '||coalesce(SQLERRM,'unknown'));
PERFORM fail_job(v_job_id);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;
RAISE EXCEPTION '%', SQLERRM;
END
$$;
/*
* Function to undo id-based partitioning created by this extension
*/
CREATE OR REPLACE FUNCTION undo_partition_id(p_parent_table text, p_batch_count int DEFAULT 1, p_batch_interval bigint DEFAULT NULL, p_keep_table boolean DEFAULT true) RETURNS bigint
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_adv_lock boolean;
v_batch_loop_count int := 0;
v_child_loop_total bigint := 0;
v_child_min bigint;
v_child_table text;
v_control text;
v_inner_loop_count int;
v_job_id bigint;
v_jobmon_schema text;
v_move_sql text;
v_old_search_path text;
v_part_interval bigint;
v_row record;
v_rowcount bigint;
v_step_id bigint;
v_tablename text;
v_total bigint := 0;
v_undo_count int := 0;
BEGIN
v_adv_lock := pg_try_advisory_lock(hashtext('pg_partman undo_id_partition'));
IF v_adv_lock = 'false' THEN
RAISE NOTICE 'undo_id_partition already running.';
RETURN 0;
END IF;
SELECT part_interval::bigint
, control
INTO v_part_interval
, v_control
FROM @extschema@.part_config
WHERE parent_table = p_parent_table
AND (type = 'id-static' OR type = 'id-dynamic');
IF v_part_interval IS NULL THEN
RAISE EXCEPTION 'Configuration for given parent table not found: %', p_parent_table;
END IF;
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;
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;
IF p_batch_interval IS NULL THEN
p_batch_interval := v_part_interval;
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.
v_tablename := substring(p_parent_table from position('.' in p_parent_table)+1);
EXECUTE 'DROP TRIGGER IF EXISTS '||v_tablename||'_part_trig ON '||p_parent_table;
EXECUTE 'DROP FUNCTION IF EXISTS '||p_parent_table||'_part_trig_func()';
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;
<<outer_child_loop>>
WHILE v_batch_loop_count < p_batch_count LOOP
SELECT inhrelid::regclass INTO v_child_table
FROM pg_catalog.pg_inherits
WHERE inhparent::regclass = p_parent_table::regclass
ORDER BY inhrelid ASC;
EXIT WHEN v_child_table IS NULL;
IF v_jobmon_schema IS NOT NULL THEN
v_step_id := add_step(v_job_id, 'Removing child partition: '||v_child_table);
END IF;
EXECUTE 'SELECT min('||v_control||') FROM '||v_child_table INTO v_child_min;
IF v_child_min IS NULL 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 '||v_child_loop_total||' 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. Moved '||v_child_loop_total||' rows to parent');
END IF;
END IF;
v_undo_count := v_undo_count + 1;
CONTINUE outer_child_loop;
END IF;
v_inner_loop_count := 1;
v_child_loop_total := 0;
<<inner_child_loop>>
LOOP
-- Get everything from the current child minimum up to the multiples of the given interval
v_move_sql := 'WITH move_data AS (DELETE FROM '||v_child_table||
' WHERE '||v_control||' <= '||quote_literal(v_child_min + (p_batch_interval * v_inner_loop_count))||' RETURNING *)
INSERT INTO '||p_parent_table||' SELECT * FROM move_data';
EXECUTE v_move_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total := v_total + v_rowcount;
v_child_loop_total := v_child_loop_total + v_rowcount;
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Moved '||v_child_loop_total||' rows to parent.');
END IF;
EXIT inner_child_loop WHEN v_rowcount = 0; -- exit before loop incr if table is empty
v_inner_loop_count := v_inner_loop_count + 1;
v_batch_loop_count := v_batch_loop_count + 1;
EXIT outer_child_loop WHEN v_batch_loop_count >= p_batch_count; -- Exit outer FOR loop if p_batch_count is reached
END LOOP inner_child_loop;
END LOOP outer_child_loop;
IF v_batch_loop_count < p_batch_count 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');
PERFORM update_step(v_step_id, 'OK', 'Done');
END IF;
END IF;
RAISE NOTICE 'Copied % row(s) to the parent. Removed % partitions.', v_total, v_undo_count;
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) to the parent. Removed '||v_undo_count||' partitions.');
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;
PERFORM pg_advisory_unlock(hashtext('pg_partman undo_id_partition'));
RETURN v_total;
EXCEPTION
WHEN OTHERS THEN
IF v_jobmon_schema IS NOT NULL THEN
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
IF v_job_id IS NULL THEN
v_job_id := add_job('PARTMAN UNDO PARTITIONING: '||p_parent_table);
v_step_id := add_step(v_job_id, 'Partition function maintenance for table '||p_parent_table||' failed');
ELSIF v_step_id IS NULL THEN
v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
END IF;
PERFORM update_step(v_step_id, 'CRITICAL', 'ERROR: '||coalesce(SQLERRM,'unknown'));
PERFORM fail_job(v_job_id);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;
RAISE EXCEPTION '%', SQLERRM;
END
$$;
/*
* Function to undo time-based partitioning created by this extension
*/
CREATE OR REPLACE FUNCTION undo_partition_time(p_parent_table text, p_batch_count int DEFAULT 1, p_batch_interval interval DEFAULT NULL, p_keep_table boolean DEFAULT true) RETURNS bigint
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_adv_lock boolean;
v_batch_loop_count int := 0;
v_child_min timestamptz;
v_child_loop_total bigint := 0;
v_child_table text;
v_control text;
v_inner_loop_count int;
v_job_id bigint;
v_jobmon_schema text;
v_move_sql text;
v_old_search_path text;
v_part_interval interval;
v_row record;
v_rowcount bigint;
v_step_id bigint;
v_tablename text;
v_total bigint := 0;
v_undo_count int := 0;
BEGIN
v_adv_lock := pg_try_advisory_lock(hashtext('pg_partman undo_time_partition'));
IF v_adv_lock = 'false' THEN
RAISE NOTICE 'undo_time_partition already running.';
RETURN 0;
END IF;
SELECT part_interval::interval
, control
INTO v_part_interval
, v_control
FROM @extschema@.part_config
WHERE parent_table = p_parent_table
AND (type = 'time-static' OR type = 'time-dynamic');
IF v_part_interval IS NULL THEN
RAISE EXCEPTION 'Configuration for given parent table not found: %', p_parent_table;
END IF;
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;
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;
IF p_batch_interval IS NULL THEN
p_batch_interval := v_part_interval;
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.
v_tablename := substring(p_parent_table from position('.' in p_parent_table)+1);
EXECUTE 'DROP TRIGGER IF EXISTS '||v_tablename||'_part_trig ON '||p_parent_table;
EXECUTE 'DROP FUNCTION IF EXISTS '||p_parent_table||'_part_trig_func()';
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;
<<outer_child_loop>>
WHILE v_batch_loop_count < p_batch_count LOOP
SELECT inhrelid::regclass INTO v_child_table
FROM pg_catalog.pg_inherits
WHERE inhparent::regclass = p_parent_table::regclass
ORDER BY inhrelid ASC;
EXIT WHEN v_child_table IS NULL;
IF v_jobmon_schema IS NOT NULL THEN
v_step_id := add_step(v_job_id, 'Removing child partition: '||v_child_table);
END IF;
EXECUTE 'SELECT min('||v_control||') FROM '||v_child_table INTO v_child_min;
IF v_child_min IS NULL 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 '||v_child_loop_total||' 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. Moved '||v_child_loop_total||' rows to parent');
END IF;
END IF;
v_undo_count := v_undo_count + 1;
CONTINUE outer_child_loop;
END IF;
v_inner_loop_count := 1;
v_child_loop_total := 0;
<<inner_child_loop>>
LOOP
-- Get everything from the current child minimum up to the multiples of the given interval
v_move_sql := 'WITH move_data AS (DELETE FROM '||v_child_table||
' WHERE '||v_control||' <= '||quote_literal(v_child_min + (p_batch_interval * v_inner_loop_count))||' RETURNING *)
INSERT INTO '||p_parent_table||' SELECT * FROM move_data';
EXECUTE v_move_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total := v_total + v_rowcount;
v_child_loop_total := v_child_loop_total + v_rowcount;
IF v_jobmon_schema IS NOT NULL THEN
PERFORM update_step(v_step_id, 'OK', 'Moved '||v_child_loop_total||' rows to parent.');
END IF;
EXIT inner_child_loop WHEN v_rowcount = 0; -- exit before loop incr if table is empty
v_inner_loop_count := v_inner_loop_count + 1;
v_batch_loop_count := v_batch_loop_count + 1;
EXIT outer_child_loop WHEN v_batch_loop_count >= p_batch_count; -- Exit outer FOR loop if p_batch_count is reached
END LOOP inner_child_loop;
END LOOP outer_child_loop;
IF v_batch_loop_count < p_batch_count 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');
PERFORM update_step(v_step_id, 'OK', 'Done');
END IF;
END IF;
RAISE NOTICE 'Copied % row(s) to the parent. Removed % partitions.', v_total, v_undo_count;
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) to the parent. Removed '||v_undo_count||' partitions.');
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;
PERFORM pg_advisory_unlock(hashtext('pg_partman undo_time_partition'));
RETURN v_total;
EXCEPTION
WHEN OTHERS THEN
IF v_jobmon_schema IS NOT NULL THEN
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||''',''false'')';
IF v_job_id IS NULL THEN
v_job_id := add_job('PARTMAN UNDO PARTITIONING: '||p_parent_table);
v_step_id := add_step(v_job_id, 'Partition function maintenance for table '||p_parent_table||' failed');
ELSIF v_step_id IS NULL THEN
v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
END IF;
PERFORM update_step(v_step_id, 'CRITICAL', 'ERROR: '||coalesce(SQLERRM,'unknown'));
PERFORM fail_job(v_job_id);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
END IF;
RAISE EXCEPTION '%', SQLERRM;
END
$$;
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