Add psql scripts

postgres/postgres_alloy_columnar_engine_queries.sql

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+-- Copyright 2025 shaneborden
+-- 
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+-- 
+--     https://www.apache.org/licenses/LICENSE-2.0
+-- 
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+/* Helpful Links 
+https://cloud.google.com/alloydb/docs/columnar-engine/manage-content-recommendations
+https://medium.com/google-cloud/alloydbs-columnar-store-how-to-preserve-it-during-failovers-and-restarts-141a8466772 */
+
+/* determine columnar engine settings */
+select name,setting,boot_val,reset_val from pg_settings where name like '%google_columnar_engine%' order by 1;
+
+/* Set a population policy */
+SELECT google_columnar_engine_add_policy('RECOMMEND_AND_POPULATE_COLUMNS','IMMEDIATE',0,'HOURS');
+--IMMEDIATE - runs immediately one time. When you use this value, specify 0 and 'HOURS' for the duration and time_unit parameters.
+--AFTER - runs once when the duration time_unit amount of time passes
+--EVERY - runs repeatedly every duration time_unit amount of time
+
+/* Execute a recommendation */
+SELECT google_columnar_engine_run_recommendation(102400,'PERFORMANCE_OPTIMAL');
+
+/* check from psql if columnar is enabled */
+postgres=# show google_columnar_engine.enabled;
+ google_columnar_engine.enabled
+--------------------------------
+ off
+
+ /* To show columnar messages in cloud logging */
+textPayload=~"population_jobs.cc|Invalidating columnar|population.cc|columnar"
+
+/* To Force a SEQ Scan for invalid blocks; this is the default now; Use this for debugging only */
+set session google_columnar_engine.rowstore_scan_mode to 1;
+
+/* To show the refresh threshold (based on invalid blocks vs total blocks) */
+show google_columnar_engine.refresh_threshold_percentage;
+
+/* To show the number of DML operations on base table required before the refresh_threshold_percentage kicks in */
+show google_columnar_engine.refresh_threshold_scan_count;
+
+/* to force a columnar scan; generally isnt needed, this is for testing / debugging only */
+set session google_columnar_engine.force_columnar_mode to true;
+
+/* other GUC to influence CE costing, this is for testing / debugging only */
+set session enable_cache_aware_costing = true 
+set session google_columnar_engine.bump_columnar_scan_cost = false
+
+/* to force columnar using pg_hint_plan */
+/*+ ColumnarScan(xxx) */
+
+/* To manually run the job: */
+SELECT google_columnar_engine_recommend();
+
+/* To view the list of recommended columns: */
+SELECT * FROM g_columnar_recommended_columns;
+SELECT database_name, schema_name, relation_name, column_name FROM g_columnar_recommended_columns;
+
+/* To add a table */
+SELECT google_columnar_engine_add('t1');
+select google_columnar_engine_add(relation => 'public.t1', in_background => TRUE);
+
+/* To add a table with a subset of columns */
+SELECT google_columnar_engine_add('public.t1', 'a,b,c,f,');
+
+/* To remove a table */
+SELECT google_columnar_engine_drop('t1');
+SELECT google_columnar_engine_drop('public.t1');
+
+/* To disable columnar for a query in a session */
+set session google_columnar_engine.enable_columnar_scan TO 'off';
+
+/* to Refresh a table */
+select google_columnar_engine_refresh('public.t1');
+
+select google_columnar_engine_refresh(relation => 'public.t1', in_background => TRUE);
+
+/* to check columar jobs */
+select * from g_columnar_jobs;
+
+/* To view the list of recommended column detail: */
+SELECT
+	crc.database_name as database_name,
+	crc.schema_name AS schema_name,
+	crc.relation_name AS table_name,
+	pi.inhparent::regclass,
+	crc.column_name,
+	crc.column_format,
+	crc.compression_level,
+	crc.estimated_size_in_bytes
+FROM public.g_columnar_recommended_columns_internal /* g_columnar_recommended_columns */ crc
+JOIN pg_stat_all_tables ps
+	ON ps.schemaname::text = crc.schema_name 
+		AND ps.relname::text = crc.relation_name
+JOIN pg_class pc
+	ON ps.relid = pc.oid
+LEFT JOIN pg_catalog.pg_inherits pi
+	ON ps.relid = pi.inhrelid
+ORDER BY 1,2,4 NULLS LAST;
+
+/* to display table name without column detail */
+SELECT
+	crc.database_name as database_name,
+	crc.schema_name AS schema_name,
+	crc.relation_name AS table_name,
+	pi.inhparent::regclass,
+	crc.column_format,
+	crc.compression_level,
+	SUM(crc.estimated_size_in_bytes) as total_bytes,
+	pg_size_pretty(SUM(crc.estimated_size_in_bytes)) as pretty_total_size
+FROM g_columnar_recommended_columns crc
+JOIN pg_stat_all_tables ps
+	ON ps.schemaname::text = crc.schema_name 
+		AND ps.relname::text = crc.relation_name
+JOIN pg_class pc
+	ON ps.relid = pc.oid
+LEFT JOIN pg_catalog.pg_inherits pi
+	ON ps.relid = pi.inhrelid
+GROUP BY crc.database_name, crc.schema_name, crc.relation_name, pi.inhparent::regclass,crc.column_format,crc.compression_level
+ORDER BY 1,2,4 NULLS LAST;
+
+
+/* List of items in the column store */
+SELECT
+    database_name,
+    schema_name,
+    relation_name,
+    column_name,
+    column_type,
+    status,
+    size_in_bytes,
+    last_accessed_time,
+    num_times_accessed
+FROM
+    g_columnar_columns;
+
+SELECT
+    *
+FROM
+    g_columnar_columns;
+
+SELECT
+    *
+FROM
+    g_columnar_relations
+ORDER BY
+    relation_name;
+
+
+/* To see current status of items in columnstore */
+SELECT
+    schema_name,
+    relation_name,
+    status,
+    swap_status,
+    sum(end_block - start_block) ttl_block,
+    sum(invalid_block_count) invalid_block,
+    CASE WHEN sum(end_block - start_block) > 0 THEN
+       round(100 * sum(invalid_block_count) / sum(end_block - start_block), 1)
+    ELSE 0.0
+    END AS invalid_block_perc,
+    pg_size_pretty(sum(size)) ttl_size,
+    pg_size_pretty(sum(cached_size_bytes)) ttl_cached_size
+FROM
+    g_columnar_units
+WHERE
+    g_columnar_units.database_name = current_database()
+    and g_columnar_units.relation_name like '%'
+GROUP BY
+    schema_name,
+    relation_name,
+    status,
+    swap_status
+ORDER BY
+    relation_name;
+
+/* Check utilization of columnar memory */
+SELECT
+    memory_name,
+    memory_total / 1024 / 1024 memory_total_MB,
+    memory_available / 1024 / 1024 memory_available_MB,
+    memory_available_percentage,
+    pg_size_pretty(google_columnar_engine_storage_cache_used()*1024*1024) AS cc_storage_cache_used_mb,
+    pg_size_pretty(google_columnar_engine_storage_cache_available()*1024*1024) AS cc_storage_cache_avail_mb,
+    pg_size_pretty((google_columnar_engine_storage_cache_available() - google_columnar_engine_storage_cache_used())*1024*1024) as cc_storage_cache_free_mb
+FROM
+    g_columnar_memory_usage;
+
+/* Check non default "google" postgres params */
+SELECT
+    s.name AS "Parameter",
+    pg_catalog.current_setting(s.name) AS "Value"
+FROM
+    pg_catalog.pg_settings s
+WHERE
+    1=1
+    --AND s.source <> 'default'
+    --AND s.setting IS DISTINCT FROM s.boot_val
+    AND lower(s.name) LIKE '%google%'
+ORDER BY
+    1;
+
+/* To see Columnar engine column Swap-out */
+SELECT
+	memory_name,
+    pg_size_pretty(memory_total) AS cc_allocated,
+    pg_size_pretty(memory_total - memory_available) AS cc_consumed,
+    pg_size_pretty(memory_available) cc_available,
+    --google_columnar_engine_storage_cache_total() as cc_storage_cache_avail_mb, /* Future function */
+    google_columnar_engine_storage_cache_used() AS cc_storage_cache_used_mb,
+    google_columnar_engine_storage_cache_available() AS cc_storage_cache_avail_mb,
+    CASE WHEN google_columnar_engine_storage_cache_used() > 0 THEN
+        'Swapped-out Column(s)'
+    ELSE
+        NULL
+    END AS "SwapOut",
+    (
+        SELECT
+            CONCAT_WS('-', STRING_AGG(DISTINCT g_columnar_units.relation_name, '/'), STATUS, swap_status)
+        FROM
+            g_columnar_units
+        GROUP BY
+            status,
+            swap_status) AS current_obj
+FROM
+    g_columnar_memory_usage
+WHERE
+    memory_name = 'main_pool';
+
+
+/* To populate many tables manually */
+do
+$$
+declare
+    f record;
+    gResult numeric;
+    begin_timestamp timestamp;
+    age_text text;
+begin
+    for f in SELECT 
+             n.nspname as schemaname,
+             c.oid::regclass::text AS table_name,
+             c.oid as oid,
+             pi.inhparent::regclass::text AS top_table_name,
+             pg_total_relation_size(c.oid) as size,
+             pg_size_pretty(pg_total_relation_size(c.oid)) as pretty_size
+             FROM pg_class c
+             JOIN pg_namespace n on c.relnamespace = n.oid
+             LEFT JOIN pg_inherits pi on c.oid = pi.inhrelid
+             WHERE c.relkind IN ('r', 't', 'm')
+             AND (n.nspname NOT IN('pg_toast') AND n.nspname LIKE '%')
+             --AND (c.oid::regclass::text LIKE '%' AND pi.inhparent::regclass::text LIKE '%')
+             AND (c.oid::regclass::text LIKE 'table_name%' AND pi.inhparent::regclass::text LIKE 'table_partiton_name%')
+             ORDER BY 2 NULLS LAST
+    loop
+    	BEGIN
+    		SELECT clock_timestamp() into begin_timestamp;
+			--SELECT google_columnar_engine_add(f.oid,'[comma separated column list]') into gResult; /* us this if there are specific cols */
+			SELECT google_columnar_engine_add(f.oid) into gResult;
+			SELECT age(clock_timestamp(),begin_timestamp)::text into age_text;
+			raise notice ' % % % % % %', f.top_table_name, f.table_name, 'google_columnar_engine_add result: ', gResult, ' time: ', age_text;
+		EXCEPTION WHEN OTHERS THEN
+			raise notice ' % % % %', f.top_table_name, f.table_name, 'exception result', gResult;
+		END;
+    end loop;
+end;
+$$;
+
+
+/* To refresh many tables manually */
+do
+$$
+declare
+    f record;
+    gResult numeric;
+begin
+    for f in SELECT 
+             n.nspname as schemaname,
+             c.oid::regclass::text AS table_name,
+             c.oid as oid,
+             pi.inhparent::regclass::text AS top_table_name,
+             pg_total_relation_size(c.oid) as size,
+             pg_size_pretty(pg_total_relation_size(c.oid)) as pretty_size
+             FROM pg_class c
+             JOIN pg_namespace n on c.relnamespace = n.oid
+             LEFT JOIN pg_inherits pi on c.oid = pi.inhrelid
+             WHERE c.relkind IN ('r', 't', 'm')
+             AND (n.nspname NOT IN('pg_toast') AND n.nspname LIKE '%')
+             --AND (c.oid::regclass::text LIKE '%' AND pi.inhparent::regclass::text LIKE '%')
+             AND (c.oid::regclass::text LIKE 'table_name%' AND pi.inhparent::regclass::text LIKE 'table_partiton_name%')
+             ORDER BY 2 NULLS LAST
+    loop
+    	BEGIN
+			SELECT google_columnar_engine_refresh(f.oid) into gResult;
+			raise notice ' % % % %', f.top_table_name, f.table_name, 'google_columnar_engine_refresh result: ', gResult;
+		EXCEPTION WHEN OTHERS THEN
+			raise notice ' % % % %', f.top_table_name, f.table_name, 'exception result', gResult;
+		END;
+    end loop;
+end;
+$$;
+
+/* To drop many tables manually */
+do
+$$
+declare
+    f record;
+    gResult numeric;
+begin
+    for f in SELECT 
+             n.nspname as schemaname,
+             c.oid::regclass::text AS table_name,
+             c.oid as oid,
+             pi.inhparent::regclass::text AS top_table_name,
+             pg_total_relation_size(c.oid) as size,
+             pg_size_pretty(pg_total_relation_size(c.oid)) as pretty_size
+             FROM pg_class c
+             JOIN pg_namespace n on c.relnamespace = n.oid
+             LEFT JOIN pg_inherits pi on c.oid = pi.inhrelid
+             JOIN g_columnar_units ce on (ce.schema_name = n.nspname and ce.relation_name = c.oid::regclass::text)
+             WHERE c.relkind IN ('r', 't', 'm')
+             AND (n.nspname NOT IN('pg_toast') AND n.nspname LIKE '%')
+             --AND (c.oid::regclass::text LIKE '%' AND pi.inhparent::regclass::text LIKE '%')
+             AND (c.oid::regclass::text LIKE 'table_name%' AND pi.inhparent::regclass::text LIKE 'table_partiton_name%')
+             ORDER BY 2 NULLS LAST
+    loop
+    	BEGIN
+			SELECT google_columnar_engine_drop(f.oid) into gResult;
+			raise notice ' % % % %', f.top_table_name, f.table_name, 'google_columnar_engine_add result: ', gResult;
+		EXCEPTION WHEN OTHERS THEN
+			raise notice ' % % % %', f.top_table_name, f.table_name, 'exception result', gResult;
+		END;
+    end loop;
+end;
+$$;