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
[email protected]
