On Fri, 14 Mar, 2025, 09:11 Ron Johnson, <ronljohnsonjr@xxxxxxxxx> wrote:
On Thu, Mar 13, 2025 at 11:25 PM Durgamahesh Manne <maheshpostgres9@xxxxxxxxx> wrote:--On Fri, Mar 14, 2025 at 8:19 AM Ron Johnson <ronljohnsonjr@xxxxxxxxx> wrote:On Thu, Mar 13, 2025 at 10:16 PM Durgamahesh Manne <maheshpostgres9@xxxxxxxxx> wrote:[snip]Hi Adrian Klaver1) Postgres version.select version();
version
---------------------------------------------------------------------------------------------------------------
PostgreSQL 14.12 on aarch64-unknown-linux-gnu, compiled by gcc (GCC) 7.3.1 20180712 (Red Hat 7.3.1-6), 64-bit
2) Complete(including indexes) table schema.
Table "liveaggregations.cachekeys"
Column | Type | Collation | Nullable | Default | Storage | Compression
---------------+------------------------+-----------+----------+---------+----------+------------
cachetype | character varying(255) | | | | extended |
trsid | character varying(255) | | | | extended |
brandid | character varying(255) | | | | extended |
sportid | character varying(255) | | | | extended |
competitionid | character varying(255) | | | | extended |
eventid | character varying(255) | | | | extended |
marketid | character varying(255) | | | | extended |
selectionid | character varying(255) | | | | extended |
keytype | character varying(255) | | | | extended |
key | character varying(255) | | not null | | extended |
Indexes:
"cachekeys_key_pk" PRIMARY KEY, btree (key)
"idx_cachekeys" btree (cachetype, trsid, brandid, sportid, competitionid, eventid, marketid)
"idx_marketid" btree (marketid)
3) Output of EXPLAIN ANALYZE of query.Result (cost=2.80..2.83 rows=1 width=1) (actual time=0.030..0.030 rows=1 loops=1)
InitPlan 1 (returns $0)
-> Index Only Scan using idx_cachekeys on cachekeys (cost=0.55..2.80 rows=1 width=0) (actual time=0.029..0.029 rows=1 loops=1)
Index Cond: ((cachetype = 'BoMatrix'::text) AND (trsid = 'daznbetuk'::text) AND (brandid = 'daznbet'::text) AND (sportid = 'BOX'::text) AND (competitionid = 'U-1998'::text) AND (eventid = 'U-523596'::text))
Heap Fetches: 0
Planning Time: 0.221 ms
Execution Time: 0.046 msThat looks pretty reasonable.1. Now show what happens with the LIMIT clause.2. How many rows does it return?3. Do you keep the table regularly vacuumed and analyzed?Hey Ron1. Now show what happens with the LIMIT clause.and result set of query and Size of the table 287MBexists--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
--------
t
(1 row)
Result (cost=2.80..2.83 rows=1 width=1) (actual time=0.029..0.030 rows=1 loops=1)
InitPlan 1 (returns $0)
-> Index Only Scan using idx_cachekeys on cachekeys (cost=0.55..2.80 rows=1 width=0) (actual time=0.028..0.028 rows=1 loops=1)
Index Cond: ((cachetype = 'BoMatrix'::text) AND (trsid = 'daznbetuk'::text) AND (brandid = 'daznbet'::text) AND (sportid = 'BOX'::text) AND (competitionid = 'U-1998'::text) AND (eventid = 'U-523596'::text))
Heap Fetches: 1
Planning Time: 0.084 ms
Execution Time: 0.043 msThis might be due to caching. Run the query with LIMIT three times, and then remove the LIMIT and run three times.Honestly, though, the execution timings seem pretty good. What exactly is the problem?Death to <Redacted>, and butter sauce.Don't boil me, I'm still alive.<Redacted> lobster!
Hi Team and Andrian
LIMIT is not necessary to use in select here in this case
To return one row takes 43ms is not optimal
Regards,
Durga Mahesh
