/usr/share/postgresql/9.5/extension/mimeo--0.10.5--0.10.6.sql is in postgresql-9.5-mimeo 1.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- Note in docs that the only type of indexes from the source tables that are currently supported properly when recreating them on the destination are B-tree.
/*
* Refresh insert only table based on timestamp control field
*/
CREATE OR REPLACE FUNCTION refresh_inserter(p_destination text, p_limit integer DEFAULT NULL, p_repull boolean DEFAULT false, p_repull_start text DEFAULT NULL, p_repull_end text DEFAULT NULL, p_debug boolean DEFAULT false) RETURNS void
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_adv_lock boolean;
v_batch_limit_reached int := 0;
v_boundary timestamptz;
v_cols_n_types text;
v_cols text;
v_condition text;
v_control text;
v_create_sql text;
v_dblink int;
v_dblink_name text;
v_dblink_schema text;
v_delete_sql text;
v_dest_table text;
v_dst_active boolean;
v_dst_check boolean;
v_dst_start int;
v_dst_end int;
v_fetch_sql text;
v_filter text[];
v_full_refresh boolean := false;
v_insert_sql text;
v_job_id int;
v_jobmon_schema text;
v_job_name text;
v_last_fetched timestamptz;
v_last_value timestamptz;
--v_last_value_new timestamptz;
v_limit int;
v_now timestamptz := now();
v_old_search_path text;
v_remote_sql text;
v_rowcount bigint := 0;
v_source_table text;
v_step_id int;
v_tmp_table text;
v_total bigint := 0;
BEGIN
IF p_debug IS DISTINCT FROM true THEN
PERFORM set_config( 'client_min_messages', 'warning', true );
END IF;
v_job_name := 'Refresh Inserter: '||p_destination;
v_dblink_name := 'mimeo_inserter_refresh_'||p_destination;
SELECT nspname INTO v_dblink_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'dblink' AND e.extnamespace = n.oid;
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
-- Set custom search path to allow easier calls to other functions, especially job logging
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||',public'',''false'')';
v_job_id := add_job(v_job_name);
PERFORM gdb(p_debug,'Job ID: '||v_job_id::text);
-- Take advisory lock to prevent multiple calls to function overlapping
v_adv_lock := pg_try_advisory_lock(hashtext('refresh_inserter'), hashtext(v_job_name));
IF v_adv_lock = 'false' THEN
v_step_id := add_step(v_job_id,'Obtaining advisory lock for job: '||v_job_name);
PERFORM gdb(p_debug,'Obtaining advisory lock FAILED for job: '||v_job_name);
PERFORM update_step(v_step_id, 'WARNING','Found concurrent job. Exiting gracefully');
PERFORM fail_job(v_job_id, 2);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
RETURN;
END IF;
SELECT source_table
, dest_table
, 'tmp_'||replace(dest_table,'.','_')
, dblink
, control
, last_value
, now() - boundary::interval
, filter
, condition
, dst_active
, dst_start
, dst_end
, batch_limit
FROM refresh_config_inserter WHERE dest_table = p_destination
INTO v_source_table
, v_dest_table
, v_tmp_table
, v_dblink
, v_control
, v_last_value
, v_boundary
, v_filter
, v_condition
, v_dst_active
, v_dst_start
, v_dst_end
, v_limit;
IF NOT FOUND THEN
RAISE EXCEPTION 'ERROR: no configuration found for %',v_job_name;
END IF;
-- Do not allow this function to run during DST time change if config option is true. Otherwise will miss data from source
IF v_dst_active THEN
v_dst_check := @extschema@.dst_change(v_now);
IF v_dst_check THEN
IF to_number(to_char(v_now, 'HH24MM'), '0000') > v_dst_start AND to_number(to_char(v_now, 'HH24MM'), '0000') < v_dst_end THEN
v_step_id := add_step( v_job_id, 'DST Check');
PERFORM update_step(v_step_id, 'OK', 'Job CANCELLED - Does not run during DST time change');
PERFORM close_job(v_job_id);
PERFORM gdb(p_debug, 'Cannot run during DST time change');
UPDATE refresh_config_inserter SET last_run = CURRENT_TIMESTAMP WHERE dest_table = p_destination;
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_inserter'), hashtext(v_job_name));
RETURN;
END IF;
END IF;
END IF;
v_step_id := add_step(v_job_id,'Building SQL');
IF v_filter IS NULL THEN
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attrelid = p_destination::regclass AND attnum > 0 AND attisdropped is false;
ELSE
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attrelid = p_destination::regclass AND ARRAY[attname::text] <@ v_filter AND attnum > 0 AND attisdropped is false;
END IF;
PERFORM dblink_connect(v_dblink_name, auth(v_dblink));
IF p_limit IS NOT NULL THEN
v_limit := p_limit;
END IF;
IF p_repull THEN
-- Repull ALL data if no start and end values set
IF p_repull_start IS NULL AND p_repull_end IS NULL THEN
PERFORM update_step(v_step_id, 'OK','Request to repull ALL data from source. This could take a while...');
EXECUTE 'TRUNCATE '||v_dest_table;
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition;
END IF;
ELSE
PERFORM update_step(v_step_id, 'OK','Request to repull data from '||COALESCE(p_repull_start, '-infinity')||' to '||COALESCE(p_repull_end, 'infinity'));
PERFORM gdb(p_debug,'Request to repull data from '||COALESCE(p_repull_start, '-infinity')||' to '||COALESCE(p_repull_end, 'infinity'));
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition || ' AND ';
ELSE
v_remote_sql := v_remote_sql || ' WHERE ';
END IF;
v_remote_sql := v_remote_sql ||v_control||' > '||quote_literal(COALESCE(p_repull_start, '-infinity'))||' AND '
||v_control||' < '||quote_literal(COALESCE(p_repull_end, 'infinity'));
-- Delete the old local data
v_delete_sql := 'DELETE FROM '||v_dest_table||' WHERE '||v_control||' > '||quote_literal(COALESCE(p_repull_start, '-infinity'))||' AND '
||v_control||' < '||quote_literal(COALESCE(p_repull_end, 'infinity'));
v_step_id := add_step(v_job_id, 'Deleting current, local data');
PERFORM gdb(p_debug,'Deleting current, local data: '||v_delete_sql);
EXECUTE v_delete_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK', v_rowcount || 'rows removed');
END IF;
ELSE
-- does < for upper boundary to keep missing data from happening on rare edge case where a newly inserted row outside the transaction batch
-- has the exact same timestamp as the previous batch's max timestamp
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition || ' AND ';
ELSE
v_remote_sql := v_remote_sql || ' WHERE ';
END IF;
v_remote_sql := v_remote_sql ||v_control||' > '||quote_literal(v_last_value)||' AND '||v_control||' < '||quote_literal(v_boundary)||' ORDER BY '||v_control||' ASC LIMIT '|| COALESCE(v_limit::text, 'ALL');
PERFORM update_step(v_step_id, 'OK','Grabbing rows from '||v_last_value::text||' to '||v_boundary::text);
PERFORM gdb(p_debug,'Grabbing rows from '||v_last_value::text||' to '||v_boundary::text);
END IF;
EXECUTE 'CREATE TEMP TABLE '||v_tmp_table||' ('||v_cols_n_types||')';
PERFORM gdb(p_debug,v_remote_sql);
PERFORM dblink_open(v_dblink_name, 'mimeo_cursor', v_remote_sql);
v_step_id := add_step(v_job_id, 'Inserting new records into local table');
v_rowcount := 0;
v_total := 0;
LOOP
v_fetch_sql := 'INSERT INTO '||v_tmp_table||'('||v_cols||')
SELECT '||v_cols||' FROM dblink_fetch('||quote_literal(v_dblink_name)||', ''mimeo_cursor'', 50000) AS ('||v_cols_n_types||')';
EXECUTE v_fetch_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total := v_total + coalesce(v_rowcount, 0);
EXECUTE 'SELECT max('||v_control||') FROM '||v_tmp_table INTO v_last_fetched;
IF v_limit IS NULL THEN -- insert into the real table in batches if no limit to avoid excessively large temp tables
EXECUTE 'INSERT INTO '||v_dest_table||' ('||v_cols||') SELECT '||v_cols||' FROM '||v_tmp_table;
EXECUTE 'TRUNCATE '||v_tmp_table;
END IF;
EXIT WHEN v_rowcount = 0;
PERFORM gdb(p_debug,'Fetching rows in batches: '||v_total||' done so far. Last fetched: '||v_last_fetched);
PERFORM update_step(v_step_id, 'PENDING', 'Fetching rows in batches: '||v_total||' done so far. Last fetched: '||v_last_fetched);
END LOOP;
PERFORM dblink_close(v_dblink_name, 'mimeo_cursor');
PERFORM update_step(v_step_id, 'OK','Rows fetched: '||v_total);
IF v_limit IS NULL THEN
-- nothing else to do
ELSE
-- When using batch limits, entire batch must be pulled to temp table before inserting to real table to catch edge cases
v_step_id := add_step(v_job_id,'Checking for batch limit issues');
PERFORM gdb(p_debug, 'Checking for batch limit issues');
-- Not recommended that the batch actually equal the limit set if possible. Handle all edge cases to keep data consistent
IF v_total >= v_limit THEN
PERFORM update_step(v_step_id, 'WARNING','Row count fetched equal to or greater than limit set: '||v_limit||'. Recommend increasing batch limit if possible.');
PERFORM gdb(p_debug, 'Row count fetched equal to or greater than limit set: '||v_limit||'. Recommend increasing batch limit if possible.');
EXECUTE 'SELECT max('||v_control||') FROM '||v_tmp_table INTO v_last_value;
v_step_id := add_step(v_job_id, 'Removing high boundary rows from this batch to avoid missing data');
EXECUTE 'DELETE FROM '||v_tmp_table||' WHERE '||v_control||' = '||quote_literal(v_last_value);
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK', 'Removed '||v_rowcount||' rows. Batch now contains '||v_limit - v_rowcount||' records');
PERFORM gdb(p_debug, 'Removed '||v_rowcount||' rows from batch. Batch table now contains '||v_limit - v_rowcount||' records');
v_batch_limit_reached = 2;
v_total := v_total - v_rowcount;
IF (v_limit - v_rowcount) < 1 THEN
v_step_id := add_step(v_job_id, 'Reached inconsistent state');
PERFORM update_step(v_step_id, 'CRITICAL', 'Batch contained max rows ('||v_limit||') or greater and all contained the same timestamp value. Unable to guarentee rows will ever be replicated consistently. Increase row limit parameter to allow a consistent batch.');
PERFORM gdb(p_debug, 'Batch contained max rows desired ('||v_limit||') or greaer and all contained the same timestamp value. Unable to guarentee rows will be replicated consistently. Increase row limit parameter to allow a consistent batch.');
v_batch_limit_reached = 3;
END IF;
ELSE
PERFORM update_step(v_step_id, 'OK','No issues found');
PERFORM gdb(p_debug, 'No issues found');
END IF;
IF v_batch_limit_reached <> 3 THEN
v_step_id := add_step(v_job_id,'Inserting new records into local table');
EXECUTE 'INSERT INTO '||v_dest_table||' ('||v_cols||') SELECT '||v_cols||' FROM '||v_tmp_table;
PERFORM update_step(v_step_id, 'OK','Inserted '||v_total||' records');
PERFORM gdb(p_debug, 'Inserted '||v_total||' records');
END IF;
END IF; -- end v_limit IF
IF v_batch_limit_reached <> 3 THEN
v_step_id := add_step(v_job_id, 'Setting next lower boundary');
EXECUTE 'SELECT max('||v_control||') FROM '|| v_dest_table INTO v_last_value;
UPDATE refresh_config_inserter set last_value = coalesce(v_last_value, CURRENT_TIMESTAMP), last_run = CURRENT_TIMESTAMP WHERE dest_table = p_destination;
PERFORM update_step(v_step_id, 'OK','Lower boundary value is: '|| coalesce(v_last_value, CURRENT_TIMESTAMP));
PERFORM gdb(p_debug, 'Lower boundary value is: '||coalesce(v_last_value, CURRENT_TIMESTAMP));
END IF;
EXECUTE 'DROP TABLE IF EXISTS ' || v_tmp_table;
PERFORM dblink_disconnect(v_dblink_name);
IF v_batch_limit_reached = 0 THEN
PERFORM close_job(v_job_id);
ELSIF v_batch_limit_reached = 2 THEN
-- Set final job status to level 2 (WARNING) to bring notice that the batch limit was reached and may need adjusting.
-- Preventive warning to keep replication from falling behind.
PERFORM fail_job(v_job_id, 2);
ELSIF v_batch_limit_reached = 3 THEN
-- Really bad. Critical alert!
PERFORM fail_job(v_job_id);
END IF;
-- Ensure old search path is reset for the current session
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_inserter'), hashtext(v_job_name));
EXCEPTION
WHEN QUERY_CANCELED THEN
PERFORM pg_advisory_unlock(hashtext('refresh_inserter'), hashtext(v_job_name));
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||''',''false'')';
IF dblink_get_connections() @> ARRAY[v_dblink_name] THEN
PERFORM dblink_disconnect(v_dblink_name);
END IF;
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
RAISE EXCEPTION '%', SQLERRM;
WHEN OTHERS THEN
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||''',''false'')';
IF v_job_id IS NULL THEN
v_job_id := add_job('Refresh Inserter: '||p_destination);
v_step_id := add_step(v_job_id, 'EXCEPTION before job logging started');
END IF;
IF v_step_id IS NULL THEN
v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
END IF;
IF dblink_get_connections() @> ARRAY[v_dblink_name] THEN
PERFORM dblink_disconnect(v_dblink_name);
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'')';
PERFORM pg_advisory_unlock(hashtext('refresh_inserter'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
END
$$;
/*
* Refresh insert/update only table based on timestamp control field
*/
CREATE OR REPLACE FUNCTION refresh_updater(p_destination text, p_limit integer DEFAULT NULL, p_repull boolean DEFAULT false, p_repull_start text DEFAULT NULL, p_repull_end text DEFAULT NULL, p_debug boolean DEFAULT false) RETURNS void
LANGUAGE plpgsql SECURITY DEFINER
AS $$
DECLARE
v_adv_lock boolean;
v_batch_limit_reached int := 0;
v_boundary_sql text;
v_boundary timestamptz;
v_cols_n_types text;
v_cols text;
v_condition text;
v_control text;
v_create_sql text;
v_dblink int;
v_dblink_name text;
v_dblink_schema text;
v_delete_sql text;
v_dest_table text;
v_dst_active boolean;
v_dst_check boolean;
v_dst_start int;
v_dst_end int;
v_fetch_sql text;
v_field text;
v_filter text[];
v_full_refresh boolean := false;
v_insert_sql text;
v_job_id int;
v_jobmon_schema text;
v_job_name text;
v_last_fetched timestamptz;
v_last_value timestamptz;
v_limit int;
v_now timestamptz := now();
v_old_search_path text;
v_pk_counter int := 1;
v_pk_name text[];
v_remote_boundry_sql text;
v_remote_boundry timestamptz;
v_remote_sql text;
v_rowcount bigint := 0;
v_source_table text;
v_step_id int;
v_tmp_table text;
v_total bigint := 0;
BEGIN
IF p_debug IS DISTINCT FROM true THEN
PERFORM set_config( 'client_min_messages', 'warning', true );
END IF;
v_job_name := 'Refresh Updater: '||p_destination;
v_dblink_name := 'mimeo_updater_refresh_'||p_destination;
SELECT nspname INTO v_dblink_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'dblink' AND e.extnamespace = n.oid;
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;
-- Set custom search path to allow easier calls to other functions, especially job logging
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||',public'',''false'')';
v_job_id := add_job(v_job_name);
PERFORM gdb(p_debug,'Job ID: '||v_job_id::text);
-- Take advisory lock to prevent multiple calls to function overlapping
v_adv_lock := pg_try_advisory_lock(hashtext('refresh_updater'), hashtext(v_job_name));
IF v_adv_lock = 'false' THEN
v_step_id := add_step(v_job_id,'Obtaining advisory lock for job: '||v_job_name);
PERFORM gdb(p_debug,'Obtaining advisory lock FAILED for job: '||v_job_name);
PERFORM update_step(v_step_id, 'WARNING','Found concurrent job. Exiting gracefully');
PERFORM fail_job(v_job_id, 2);
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
RETURN;
END IF;
SELECT source_table
, dest_table
, 'tmp_'||replace(dest_table,'.','_')
, dblink
, control
, last_value
, now() - boundary::interval
, pk_name
, filter
, condition
, dst_active
, dst_start
, dst_end
, batch_limit
FROM refresh_config_updater
WHERE dest_table = p_destination INTO
v_source_table
, v_dest_table
, v_tmp_table
, v_dblink
, v_control
, v_last_value
, v_boundary
, v_pk_name
, v_filter
, v_condition
, v_dst_active
, v_dst_start
, v_dst_end
, v_limit;
IF NOT FOUND THEN
RAISE EXCEPTION 'ERROR: no configuration found for %',v_job_name;
END IF;
-- Do not allow this function to run during DST time change if config option is true. Otherwise will miss data from source
IF v_dst_active THEN
v_dst_check := @extschema@.dst_change(v_now);
IF v_dst_check THEN
IF to_number(to_char(v_now, 'HH24MM'), '0000') > v_dst_start AND to_number(to_char(v_now, 'HH24MM'), '0000') < v_dst_end THEN
v_step_id := add_step( v_job_id, 'DST Check');
PERFORM update_step(v_step_id, 'OK', 'Job CANCELLED - Does not run during DST time change');
UPDATE refresh_config_updater SET last_run = CURRENT_TIMESTAMP WHERE dest_table = p_destination;
PERFORM close_job(v_job_id);
PERFORM gdb(p_debug, 'Cannot run during DST time change');
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_updater'), hashtext(v_job_name));
RETURN;
END IF;
END IF;
END IF;
v_step_id := add_step(v_job_id,'Building SQL');
-- determine column list, column type list
IF v_filter IS NULL THEN
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attrelid = p_destination::regclass AND attnum > 0 AND attisdropped is false;
ELSE
-- ensure all primary key columns are included in any column filters
FOREACH v_field IN ARRAY v_pk_name LOOP
IF v_field = ANY(v_filter) THEN
CONTINUE;
ELSE
RAISE EXCEPTION 'ERROR: filter list did not contain all columns that compose primary/unique key for %',v_job_name;
END IF;
END LOOP;
SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||format_type(atttypid, atttypmod)::text),',')
INTO v_cols, v_cols_n_types
FROM pg_attribute WHERE attrelid = p_destination::regclass AND ARRAY[attname::text] <@ v_filter AND attnum > 0 AND attisdropped is false;
END IF;
PERFORM dblink_connect(v_dblink_name, auth(v_dblink));
IF p_limit IS NOT NULL THEN
v_limit := p_limit;
END IF;
-- Repull old data instead of normal new data pull
IF p_repull THEN
-- Repull ALL data if no start and end values set
IF p_repull_start IS NULL AND p_repull_end IS NULL THEN
PERFORM update_step(v_step_id, 'OK','Request to repull ALL data from source. This could take a while...');
EXECUTE 'TRUNCATE '||v_dest_table;
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition;
END IF;
ELSE
PERFORM update_step(v_step_id, 'OK','Request to repull data from '||p_repull_start||' to '||p_repull_end);
PERFORM gdb(p_debug,'Request to repull data from '||p_repull_start||' to '||p_repull_end);
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition || ' AND ';
ELSE
v_remote_sql := v_remote_sql || ' WHERE ';
END IF;
v_remote_sql := v_remote_sql ||v_control||' > '||quote_literal(COALESCE(p_repull_start, '-infinity'))||' AND '
||v_control||' < '||quote_literal(COALESCE(p_repull_end, 'infinity'));
EXECUTE 'DELETE FROM '||v_dest_table||' WHERE '||v_control||' > '||quote_literal(COALESCE(p_repull_start, '-infinity'))||' AND '
||v_control||' < '||quote_literal(COALESCE(p_repull_end, 'infinity'));
END IF;
ELSE
-- does < for upper boundary to keep missing data from happening on rare edge case where a newly inserted row outside the transaction batch
-- has the exact same timestamp as the previous batch's max timestamp
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table;
IF v_condition IS NOT NULL THEN
v_remote_sql := v_remote_sql || ' ' || v_condition || ' AND ';
ELSE
v_remote_sql := v_remote_sql || ' WHERE ';
END IF;
v_remote_sql := v_remote_sql ||v_control||' > '||quote_literal(v_last_value)||' AND '||v_control||' < '||quote_literal(v_boundary)||' ORDER BY '||v_control||' ASC LIMIT '|| COALESCE(v_limit::text, 'ALL');
v_delete_sql := 'DELETE FROM '||v_dest_table||' USING '||v_tmp_table||' t WHERE ';
WHILE v_pk_counter <= array_length(v_pk_name,1) LOOP
IF v_pk_counter > 1 THEN
v_delete_sql := v_delete_sql ||' AND ';
END IF;
v_delete_sql := v_delete_sql ||v_dest_table||'.'||v_pk_name[v_pk_counter]||' = t.'||v_pk_name[v_pk_counter];
v_pk_counter := v_pk_counter + 1;
END LOOP;
PERFORM update_step(v_step_id, 'OK','Grabbing rows from '||v_last_value::text||' to '||v_boundary::text);
PERFORM gdb(p_debug,'Grabbing rows from '||v_last_value::text||' to '||v_boundary::text);
END IF;
v_insert_sql := 'INSERT INTO '||v_dest_table||' ('||v_cols||') SELECT '||v_cols||' FROM '||v_tmp_table;
PERFORM gdb(p_debug,v_remote_sql);
PERFORM dblink_open(v_dblink_name, 'mimeo_cursor', v_remote_sql);
v_step_id := add_step(v_job_id, 'Inserting new/updated records into local table');
v_rowcount := 0;
EXECUTE 'CREATE TEMP TABLE '||v_tmp_table||' ('||v_cols_n_types||')';
LOOP
v_fetch_sql := 'INSERT INTO '||v_tmp_table||'('||v_cols||')
SELECT '||v_cols||' FROM dblink_fetch('||quote_literal(v_dblink_name)||', ''mimeo_cursor'', 50000) AS ('||v_cols_n_types||')';
EXECUTE v_fetch_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
v_total := v_total + coalesce(v_rowcount, 0);
EXECUTE 'SELECT max('||v_control||') FROM '||v_tmp_table INTO v_last_fetched;
IF v_limit IS NULL THEN -- insert into the real table in batches if no limit to avoid excessively large temp tables
IF p_repull IS FALSE THEN -- Delete any rows that exist in the current temp table batch. repull delete is done above.
EXECUTE v_delete_sql;
END IF;
EXECUTE v_insert_sql;
EXECUTE 'TRUNCATE '||v_tmp_table;
END IF;
EXIT WHEN v_rowcount = 0;
PERFORM gdb(p_debug,'Fetching rows in batches: '||v_total||' done so far. Last fetched: '||v_last_fetched);
PERFORM update_step(v_step_id, 'PENDING', 'Fetching rows in batches: '||v_total||' done so far. Last fetched: '||v_last_fetched);
END LOOP;
PERFORM dblink_close(v_dblink_name, 'mimeo_cursor');
PERFORM update_step(v_step_id, 'OK','Rows fetched: '||v_total);
IF v_limit IS NULL THEN
-- nothing else to do
ELSE
-- When using batch limits, entire batch must be pulled to temp table before inserting to real table to catch edge cases
v_step_id := add_step(v_job_id,'Checking for batch limit issues');
-- Not recommended that the batch actually equal the limit set if possible.
IF v_total >= v_limit THEN
PERFORM update_step(v_step_id, 'WARNING','Row count fetched equal to or greater than limit set: '||v_limit||'. Recommend increasing batch limit if possible.');
PERFORM gdb(p_debug, 'Row count fetched equal to or greater than limit set: '||v_limit||'. Recommend increasing batch limit if possible.');
EXECUTE 'SELECT max('||v_control||') FROM '||v_tmp_table INTO v_last_value;
v_step_id := add_step(v_job_id, 'Removing high boundary rows from this batch to avoid missing data');
EXECUTE 'DELETE FROM '||v_tmp_table||' WHERE '||v_control||' = '||quote_literal(v_last_value);
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK', 'Removed '||v_rowcount||' rows. Batch now contains '||v_limit - v_rowcount||' records');
PERFORM gdb(p_debug, 'Removed '||v_rowcount||' rows from batch. Batch table now contains '||v_limit - v_rowcount||' records');
v_batch_limit_reached := 2;
IF (v_limit - v_rowcount) < 1 THEN
v_step_id := add_step(v_job_id, 'Reached inconsistent state');
PERFORM update_step(v_step_id, 'CRITICAL', 'Batch contained max rows ('||v_limit||') or greater and all contained the same timestamp value. Unable to guarentee rows will ever be replicated consistently. Increase row limit parameter to allow a consistent batch.');
PERFORM gdb(p_debug, 'Batch contained max rows ('||v_limit||') or greater and all contained the same timestamp value. Unable to guarentee rows will be replicated consistently. Increase row limit parameter to allow a consistent batch.');
v_batch_limit_reached := 3;
END IF;
ELSE
PERFORM update_step(v_step_id, 'OK','No issues found');
PERFORM gdb(p_debug, 'No issues found');
END IF;
IF v_batch_limit_reached <> 3 THEN
EXECUTE 'CREATE INDEX ON '||v_tmp_table||' ('||array_to_string(v_pk_name, ',')||')'; -- incase of large batch limit
EXECUTE 'ANALYZE '||v_tmp_table;
v_step_id := add_step(v_job_id,'Deleting records marked for update in local table');
perform gdb(p_debug,v_delete_sql);
execute v_delete_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK','Deleted '||v_rowcount||' records');
v_step_id := add_step(v_job_id,'Inserting new records into local table');
perform gdb(p_debug,v_insert_sql);
EXECUTE v_insert_sql;
GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK','Inserted '||v_rowcount||' records');
END IF;
END IF; -- end v_limit IF
IF v_batch_limit_reached <> 3 THEN
v_step_id := add_step(v_job_id, 'Setting next lower boundary');
EXECUTE 'SELECT max('||v_control||') FROM '|| v_dest_table INTO v_last_value;
UPDATE refresh_config_updater set last_value = coalesce(v_last_value, CURRENT_TIMESTAMP), last_run = CURRENT_TIMESTAMP WHERE dest_table = p_destination;
PERFORM update_step(v_step_id, 'OK','Lower boundary value is: '||coalesce(v_last_value, CURRENT_TIMESTAMP));
PERFORM gdb(p_debug, 'Lower boundary value is: '||coalesce(v_last_value, CURRENT_TIMESTAMP));
END IF;
EXECUTE 'DROP TABLE IF EXISTS '||v_tmp_table;
PERFORM dblink_disconnect(v_dblink_name);
IF v_batch_limit_reached = 0 THEN
PERFORM close_job(v_job_id);
ELSIF v_batch_limit_reached = 2 THEN
-- Set final job status to level 2 (WARNING) to bring notice that the batch limit was reached and may need adjusting.
-- Preventive warning to keep replication from falling behind.
PERFORM fail_job(v_job_id, 2);
ELSIF v_batch_limit_reached = 3 THEN
-- Really bad. Critical alert!
PERFORM fail_job(v_job_id);
END IF;
-- Ensure old search path is reset for the current session
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
PERFORM pg_advisory_unlock(hashtext('refresh_updater'), hashtext(v_job_name));
EXCEPTION
WHEN QUERY_CANCELED THEN
PERFORM pg_advisory_unlock(hashtext('refresh_updater'), hashtext(v_job_name));
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||''',''false'')';
IF dblink_get_connections() @> ARRAY[v_dblink_name] THEN
PERFORM dblink_disconnect(v_dblink_name);
END IF;
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';
RAISE EXCEPTION '%', SQLERRM;
WHEN OTHERS THEN
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||''',''false'')';
IF v_job_id IS NULL THEN
v_job_id := add_job('Refresh Updater: '||p_destination);
v_step_id := add_step(v_job_id, 'EXCEPTION before job logging started');
END IF;
IF v_step_id IS NULL THEN
v_step_id := add_step(v_job_id, 'EXCEPTION before first step logged');
END IF;
IF dblink_get_connections() @> ARRAY[v_dblink_name] THEN
PERFORM dblink_disconnect(v_dblink_name);
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'')';
PERFORM pg_advisory_unlock(hashtext('refresh_updater'), hashtext(v_job_name));
RAISE EXCEPTION '%', SQLERRM;
END
$$;
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