Re: [EXTERNAL] Need help with performance tuning pg12 on linux

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Yes, there is an explain, but that is an explain that is run without ‘analyze’ added to it.
This means the query is parsed and planned, and the resulting parse tree with planner assumptions is shown.

If you add ‘analyze to ‘explain’, the actual query is run and timed, and statistics about actual execution are shown.

Frits Hoogland




On 27 Dec 2023, at 17:01, Wilson, Maria Louise (LARC-E301)[RSES] <m.l.wilson@xxxxxxxx> wrote:

Thanks for the reply!!  Scroll down a bit – the explain is just a bit further down in the email!
Maria
 
From: Frits Hoogland <frits.hoogland@xxxxxxxxx>
Date: Wednesday, December 27, 2023 at 10:50 AM
To: "Wilson, Maria Louise (LARC-E301)[RSES]" <m.l.wilson@xxxxxxxx>
Cc: "pgsql-performance@xxxxxxxxxxxxxxxxxxxx" <pgsql-performance@xxxxxxxxxxxxxxxxxxxx>
Subject: [EXTERNAL] Re: Need help with performance tuning pg12 on linux
 
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Hi Maria, could you please run explain analyse for the problem query?
The ‘analyze’ addition will track actual spent time and show statistics to validate the planner’s assumptions.
 
Frits Hoogland
 

 



On 27 Dec 2023, at 16:38, Wilson, Maria Louise (LARC-E301)[RSES] <m.l.wilson@xxxxxxxx> wrote:
 
Hello folks!
 
I am having a complex query slowing over time increasing in duration.  If anyone has a few cycles that they could lend a hand or just point me in the right direction with this – I would surely appreciate it!  Fairly beefy Linux server with Postgres 12 (latest) – this particular query has been getting slower over time & seemingly slowing everything else down.  The server is dedicated entirely to this particular database.  Let me know if I can provide any additional information!!  Thanks in advance!
 
Here’s my background – Linux RHEL 8 – PostgreSQL 12.17.  – 
MemTotal:       263216840 kB
MemFree:         3728224 kB
MemAvailable:   197186864 kB
Buffers:            6704 kB
Cached:         204995024 kB
SwapCached:        19244 kB
 
free -m
              total        used        free      shared  buff/cache   available
Mem:         257047       51860        3722       10718      201464      192644
Swap:          4095         855        3240
 
Here are a few of the settings in our postgres server:
max_connections = 300                   # (change requires restart)
shared_buffers = 10GB
temp_buffers = 24MB
work_mem = 2GB
maintenance_work_mem = 1GB
 
most everything else is set to the default.
 
The query is complex with several joins:
 
SELECT anon_1.granule_collection_id AS anon_1_granule_collection_id, anon_1.granule_create_date AS anon_1_granule_create_date, anon_1.granule_delete_date AS anon_1_granule_delete_date, ST_AsGeoJSON(anon_1.granule_geography) AS anon_1_granule_geography, ST_AsGeoJSON(anon_1.granule_geometry) AS anon_1_granule_geometry, anon_1.granule_is_active AS anon_1_granule_is_active, anon_1.granule_properties AS anon_1_granule_properties, anon_1.granule_update_date AS anon_1_granule_update_date, anon_1.granule_uuid AS anon_1_granule_uuid, anon_1.granule_visibility_last_update_date AS anon_1_granule_visibility_last_update_date, anon_1.granule_visibility_id AS anon_1_granule_visibility_id, collection_1.id AS collection_1_id, collection_1.entry_id AS collection_1_entry_id, collection_1.short_name AS collection_1_short_name, collection_1.version AS collection_1_version, file_1.id AS file_1_id, file_1.location AS file_1_location, file_1.md5 AS file_1_md5, file_1.name AS file_1_name, file_1.size AS file_1_size, file_1.type AS file_1_type, visibility_1.id AS visibility_1_id, visibility_1.name AS visibility_1_name, visibility_1.value AS visibility_1_value
        FROM (SELECT granule.collection_id AS granule_collection_id, granule.create_date AS granule_create_date, granule.delete_date AS granule_delete_date, granule.geography AS granule_geography, granule.geometry AS granule_geometry, granule.is_active AS granule_is_active, granule.properties AS granule_properties, granule.update_date AS granule_update_date, granule.uuid AS granule_uuid, granule.visibility_last_update_date AS granule_visibility_last_update_date, granule.visibility_id AS granule_visibility_id
        FROM granule JOIN collection ON collection.id = granule.collection_id
        WHERE granule.is_active = true AND (collection.entry_id LIKE 'AJAX_CO2_CH4_1' OR collection.entry_id LIKE 'AJAX_O3_1' OR collection.entry_id LIKE 'AJAX_CH2O_1' OR collection.entry_id LIKE 'AJAX_MMS_1') AND ((granule.properties #>> '{temporal_extent, range_date_times, 0, beginning_date_time}') > '2015-10-06T23:59:59+00:00' OR (granule.properties #>> '{temporal_extent, single_date_times, 0}') > '2015-10-06T23:59:59+00:00' OR (granule.properties #>> '{temporal_extent, periodic_date_times, 0, start_date}') > '2015-10-06T23:59:59+00:00') AND ((granule.properties #>> '{temporal_extent, range_date_times, 0, end_date_time}') < '2015-10-09T00:00:00+00:00' OR (granule.properties #>> '{temporal_extent, single_date_times, 0}') < '2015-10-09T00:00:00+00:00' OR (granule.properties #>> '{temporal_extent, periodic_date_times, 0, end_date}') < '2015-10-09T00:00:00+00:00') ORDER BY granule.uuid
         LIMIT 26) AS anon_1 LEFT OUTER JOIN collection AS collection_1 ON collection_1.id = anon_1.granule_collection_id LEFT OUTER JOIN (granule_file AS granule_file_1 JOIN file AS file_1 ON file_1.id = granule_file_1.file_id) ON anon_1.granule_uuid = granule_file_1.granule_uuid LEFT OUTER JOIN visibility AS visibility_1 ON visibility_1.id = anon_1.granule_visibility_id ORDER BY anon_1.granule_uuid
 
Here’s the explain:
 
 Sort  (cost=10914809.92..10914810.27 rows=141 width=996)
   Sort Key: granule.uuid
   ->  Hash Left Join  (cost=740539.73..10914804.89 rows=141 width=996)
         Hash Cond: (granule.visibility_id = visibility_1.id)
         ->  Hash Right Join  (cost=740537.56..10914731.81 rows=141 width=1725)
               Hash Cond: (granule_file_1.granule_uuid = granule.uuid)
               ->  Hash Join  (cost=644236.90..10734681.93 rows=22332751 width=223)
                     Hash Cond: (file_1.id = granule_file_1.file_id)
                     ->  Seq Scan on file file_1  (cost=0.00..9205050.88 rows=22068888 width=207)
                     ->  Hash  (cost=365077.51..365077.51 rows=22332751 width=20)
                           ->  Seq Scan on granule_file granule_file_1  (cost=0.00..365077.51 rows=22332751 width=20)
               ->  Hash  (cost=96300.33..96300.33 rows=26 width=1518)
                     ->  Nested Loop Left Join  (cost=96092.55..96300.33 rows=26 width=1518)
                           ->  Limit  (cost=96092.27..96092.33 rows=26 width=1462)
                                 ->  Sort  (cost=96092.27..96100.47 rows=3282 width=1462)
                                       Sort Key: granule.uuid
                                       ->  Nested Loop  (cost=0.56..95998.73 rows=3282 width=1462)
                                             ->  Seq Scan on collection  (cost=0.00..3366.24 rows=1 width=4)
                                                   Filter: (((entry_id)::text ~~ 'AJAX_CO2_CH4_1'::text) OR ((entry_id)::text ~~ 'AJAX_O3_1'::text) OR ((entry_id)::text ~~ 'AJAX_CH2O_1'::text) OR ((entry_id)::text ~~ 'AJAX_MMS_1'::text))
                                             ->  Index Scan using ix_granule_collection_id on granule  (cost=0.56..92445.36 rows=18713 width=1462)
                                                   Index Cond: (collection_id = collection.id)
                                                   Filter: (is_active AND (((properties #>> '{temporal_extent,range_date_times,0,beginning_date_time}'::text[]) > '2015-10-06T23:59:59+00:00'::text) OR ((properties #>> '{temporal_extent,single_d
ate_times,0}'::text[]) > '2015-10-06T23:59:59+00:00'::text) OR ((properties #>> '{temporal_extent,periodic_date_times,0,start_date}'::text[]) > '2015-10-06T23:59:59+00:00'::text)) AND (((properties #>> '{temporal_extent,range_date_times,0,end_
date_time}'::text[]) < '2015-10-09T00:00:00+00:00'::text) OR ((properties #>> '{temporal_extent,single_date_times,0}'::text[]) < '2015-10-09T00:00:00+00:00'::text) OR ((properties #>> '{temporal_extent,periodic_date_times,0,end_date}'::text[])
 < '2015-10-09T00:00:00+00:00'::text)))
                           ->  Index Scan using collection_pkey on collection collection_1  (cost=0.28..7.99 rows=1 width=56)
                                 Index Cond: (id = granule.collection_id)
         ->  Hash  (cost=1.52..1.52 rows=52 width=16)
               ->  Seq Scan on visibility visibility_1  (cost=0.00..1.52 rows=52 width=16)
 
 
Heres a bit about the tables – 
 
Granule
Collection
Granule_file
Visibility
 
Granule:
public | granule                            | table | ims_api_writer | 36 GB   | 
 
ims_api=# \d+ granule
                                                       Table "public.granule"
           Column            |            Type             | Collation | Nullable | Default | Storage  | Stats target | Description 
-----------------------------+-----------------------------+-----------+----------+---------+----------+--------------+-------------
 collection_id               | integer                     |           | not null |         | plain    |              | 
 create_date                 | timestamp without time zone |           | not null |         | plain    |              | 
 delete_date                 | timestamp without time zone |           |          |         | plain    |              | 
 geometry                    | geometry(Geometry,4326)     |           |          |         | main     |              | 
 is_active                   | boolean                     |           |          |         | plain    |              | 
 properties                  | jsonb                       |           |          |         | extended |              | 
 update_date                 | timestamp without time zone |           | not null |         | plain    |              | 
 uuid                        | uuid                        |           | not null |         | plain    |              | 
 visibility_id               | integer                     |           | not null |         | plain    |              | 
 geography                   | geography(Geometry,4326)    |           |          |         | main     |              | 
 visibility_last_update_date | timestamp without time zone |           |          |         | plain    |              | 
Indexes:
    "granule_pkey" PRIMARY KEY, btree (uuid)
    "granule_is_active_idx" btree (is_active)
    "granule_properties_producer_id_idx" btree ((properties ->> 'producer_granule_id'::text))
    "granule_update_date_idx" btree (update_date)
    "idx_granule_geometry" gist (geometry)
    "ix_granule_collection_id" btree (collection_id)
Foreign-key constraints:
    "granule_collection_id_fkey" FOREIGN KEY (collection_id) REFERENCES collection(id)
    "granule_visibility_id_fkey" FOREIGN KEY (visibility_id) REFERENCES visibility(id)
Referenced by:
    TABLE "granule_file" CONSTRAINT "granule_file_granule_uuid_fkey" FOREIGN KEY (granule_uuid) REFERENCES granule(uuid)
    TABLE "granule_temporal_range" CONSTRAINT "granule_temporal_range_granule_uuid_fkey" FOREIGN KEY (granule_uuid) REFERENCES granule(uuid)
Triggers:
    granule_temporal_range_trigger AFTER INSERT OR DELETE OR UPDATE ON granule FOR EACH ROW EXECUTE FUNCTION sync_granule_temporal_range()
Access method: heap
 
Collection:
public | collection                         | table | ims_api_writer | 39 MB   | 
 
ims_api=# \d collection
                                                 Table "public.collection"
            Column            |            Type             | Collation | Nullable |                Default                 
------------------------------+-----------------------------+-----------+----------+----------------------------------------
 id                           | integer                     |           | not null | nextval('collection_id_seq'::regclass)
 access_constraints           | text                        |           |          | 
 additional_attributes        | jsonb                       |           |          | 
 ancillary_keywords           | character varying(160)[]    |           |          | 
 create_date                  | timestamp without time zone |           | not null | 
 dataset_language             | character varying(80)[]     |           |          | 
 dataset_progress             | text                        |           |          | 
 data_resolutions             | jsonb                       |           |          | 
 dataset_citation             | jsonb                       |           |          | 
 delete_date                  | timestamp without time zone |           |          | 
 distribution                 | jsonb                       |           |          | 
 doi                          | character varying(220)      |           |          | 
 entry_id                     | character varying(80)       |           | not null | 
 entry_title                  | character varying(1030)     |           |          | 
 geometry                     | geometry(Geometry,4326)     |           |          | 
 is_active                    | boolean                     |           | not null | 
 iso_topic_categories         | character varying[]         |           |          | 
 last_update_date             | timestamp without time zone |           | not null | 
 locations                    | jsonb                       |           |          | 
 long_name                    | character varying(1024)     |           |          | 
 metadata_associations        | jsonb                       |           |          | 
 metadata_dates               | jsonb                       |           |          | 
 personnel                    | jsonb                       |           |          | 
 platforms                    | jsonb                       |           |          | 
 processing_level_id          | integer                     |           |          | 
 product_flag                 | text                        |           |          | 
 project_id                   | integer                     |           |          | 
 properties                   | jsonb                       |           |          | 
 quality                      | jsonb                       |           |          | 
 references                   | character varying(12000)[]  |           |          | 
 related_urls                 | jsonb                       |           |          | 
 summary                      | jsonb                       |           |          | 
 short_name                   | character varying(80)       |           |          | 
 temporal_extents             | jsonb                       |           |          | 
 version                      | character varying(80)       |           |          | 
 use_constraints              | jsonb                       |           |          | 
 version_description          | text                        |           |          | 
 visibility_id                | integer                     |           | not null | 
 world_date                   | timestamp without time zone |           |          | 
 tiling_identification_system | jsonb                       |           |          | 
 collection_data_type         | text                        |           |          | 
 standard_product             | boolean                     |           | not null | false
Indexes:
    "collection_pkey" PRIMARY KEY, btree (id)
    "collection_entry_id_key" UNIQUE CONSTRAINT, btree (entry_id)
    "idx_collection_geometry" gist (geometry)
Foreign-key constraints:
    "collection_processing_level_id_fkey" FOREIGN KEY (processing_level_id) REFERENCES processing_level(id)
    "collection_project_id_fkey" FOREIGN KEY (project_id) REFERENCES project(id)
    "collection_visibility_id_fkey" FOREIGN KEY (visibility_id) REFERENCES visibility(id)
Referenced by:
    TABLE "collection_organization" CONSTRAINT "collection_organization_collection_id_fkey" FOREIGN KEY (collection_id) REFERENCES collection(id)
    TABLE "collection_science_keyword" CONSTRAINT "collection_science_keyword_collection_id_fkey" FOREIGN KEY (collection_id) REFERENCES collection(id)
    TABLE "collection_spatial_processing_hint" CONSTRAINT "collection_spatial_processing_hint_collection_id_fkey" FOREIGN KEY (collection_id) REFERENCES collection(id)
    TABLE "granule" CONSTRAINT "granule_collection_id_fkey" FOREIGN KEY (collection_id) REFERENCES collection(id)
    TABLE "granule_temporal_range" CONSTRAINT "granule_temporal_range_collection_id_fkey" FOREIGN KEY (collection_id) REFERENCES collection(id)
 
 
Granule_file:
 public | granule_file                       | table | ims_api_writer | 1108 MB | 
 
\d granule_file
               Table "public.granule_file"
    Column    |  Type   | Collation | Nullable | Default 
--------------+---------+-----------+----------+---------
 granule_uuid | uuid    |           |          | 
 file_id      | integer |           |          | 
Foreign-key constraints:
    "granule_file_file_id_fkey" FOREIGN KEY (file_id) REFERENCES file(id)
    "granule_file_granule_uuid_fkey" FOREIGN KEY (granule_uuid) REFERENCES granule(uuid)
 
 
Visibility:
public | visibility                         | table | ims_api_writer | 40 kB   | 
 
\d visibility
                                   Table "public.visibility"
 Column |         Type          | Collation | Nullable |                Default                 
--------+-----------------------+-----------+----------+----------------------------------------
 id     | integer               |           | not null | nextval('visibility_id_seq'::regclass)
 name   | character varying(80) |           | not null | 
 value  | integer               |           | not null | 
Indexes:
    "visibility_pkey" PRIMARY KEY, btree (id)
    "visibility_name_key" UNIQUE CONSTRAINT, btree (name)
    "visibility_value_key" UNIQUE CONSTRAINT, btree (value)
Referenced by:
    TABLE "collection" CONSTRAINT "collection_visibility_id_fkey" FOREIGN KEY (visibility_id) REFERENCES visibility(id)
    TABLE "granule" CONSTRAINT "granule_visibility_id_fkey" FOREIGN KEY (visibility_id) REFERENCES visibility(id)
 
 
 
 
Thanks for the help!
 
Maria Wilson
Nasa/Langley Research Center
Hampton, Virginia USA

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