Dear Nur, The below is the output for psql=> EXPLAIN ANALYZE SELECT DISTINCT feature_id FROM evidence.point p INNER JOIN evidence.observation_evidence oe ON p.feature_id = oe.evd_feature_id WHERE p.domain_class_id IN (11) AND (p.modification_time > '2015-05-10 00:06:56.056 IST' OR oe.modification_time > '2015-05-10 00:06:56.056 IST') ORDER BY feature_id
QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------- ----------------------------------------- Unique (cost=1679730.32..1679837.46 rows=21428 width=8) (actual time=154753.528..155657.818 rows=1607489 loops=1) -> Sort (cost=1679730.32..1679783.89 rows=21428 width=8) (actual time=154753.514..155087.734 rows=4053270 loops=1) Sort Key: p.feature_id Sort Method: quicksort Memory: 288302kB -> Hash Join (cost=1501657.09..1678188.87 rows=21428 width=8) (actual time=144146.620..152050.311 rows=4053270 loops=1) Hash Cond: (oe.evd_feature_id = p.feature_id) Join Filter: ((p.modification_time > '2015-05-10 03:36:56.056+05:30'::timestamp with time zone) OR (oe.modification_time > '2015-05-10 03:36:5 6.056+05:30'::timestamp with time zone)) -> Seq Scan on observation_evidence oe (cost=0.00..121733.18 rows=5447718 width=16) (actual time=0.007..1534.905 rows=5434406 loops=1) -> Hash (cost=1483472.70..1483472.70 rows=1454751 width=16) (actual time=144144.653..144144.653 rows=1607491 loops=1) Buckets: 262144 Batches: 1 Memory Usage: 75352kB -> Index Scan using point_domain_class_id_index on point p (cost=0.00..1483472.70 rows=1454751 width=16) (actual time=27.265..142101.1 59 rows=1607491 loops=1) Index Cond: (domain_class_id = 11) Total runtime: 155787.379 ms (13 rows) Regards, Dinesh Chandra |Database administrator (Oracle/PostgreSQL)| Cyient Ltd. Noida. ------------------------------------------------------------------ Mobile: +91-9953975849 | Ext 1078 |dinesh.chan...@cyient.com<mailto:%7cdinesh.chan...@cyient.com> Plot No. 7, NSEZ, Phase-II ,Noida-Dadri Road, Noida - 201 305,India. From: Nur Agus [mailto:nuragus.li...@gmail.com] Sent: 03 March, 2017 5:54 PM To: Dinesh Chandra 12108 <dinesh.chan...@cyient.com> Cc: pgsql-performance@postgresql.org Subject: Re: [PERFORM] Performance issue in PostgreSQL server... Hello Dinesh, You can try the EXPLAIN tool psql=> EXPLAIN ANALYZE SELECT DISTINCT feature_id FROM evidence.point p INNER JOIN evidence.observation_evidence oe ON p.feature_id = oe.evd_feature_id WHERE p.domain_class_id IN (11) AND (p.modification_time > '2015-05-10 00:06:56.056 IST' OR oe.modification_time > '2015-05-10 00:06:56.056 IST') ORDER BY feature_id Then paste here the result. Thanks On Fri, Mar 3, 2017 at 5:29 PM, Dinesh Chandra 12108 <dinesh.chan...@cyient.com<mailto:dinesh.chan...@cyient.com>> wrote: Dear Experts, I need your suggestions to resolve the performance issue reported on our PostgreSQL9.1 production database having 1.5 TB Size. I have observed that, some select queries with order by clause are taking lot of time in execution and forcing applications to give slow response. The configuration of database server is : Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit CPU’s : 8 Core(s) per socket: 4 Socket(s): 2 Model name: Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz RAM : 32 GB SWAP :8 Gb Kernel parameter: kernel.shmmax = 32212254720 kernel.shmall = 1073741824 Values of PostgreSQL.conf parameters are : shared_buffers = 10GB temp_buffers = 32MB work_mem = 512MB maintenance_work_mem = 2048MB max_files_per_process = 2000 checkpoint_segments = 200 max_wal_senders = 5 wal_buffers = -1 # min 32kB, -1 sets based on shared_buffers Queries taking lot of time are: ================================== 2017-03-02 00:46:50 IST LOG: duration: 2492951.927 ms execute <unnamed>: SELECT DISTINCT feature_id FROM evidence.point p INNER JOIN evidence.observation_evidence oe ON p.feature_id = oe.evd_feature_id WHERE p.domain_class_id IN (11) AND (p.modification_time > '2015-05-10 00:06:56.056 IST' OR oe.modification_time > '2015-05-10 00:06:56.056 IST') ORDER BY feature_id 2017-03-02 01:05:16 IST LOG: duration: 516250.512 ms execute <unnamed>: SELECT DISTINCT feature_id FROM evidence.point p INNER JOIN evidence.observation_evidence oe ON p.feature_id = oe.evd_feature_id WHERE p.domain_class_id IN (3) AND (p.modification_time > '2015-05-10 01:22:59.059 IST' OR oe.modification_time > '2015-05-10 01:22:59.059 IST') ORDER BY feature_id Top command output: top - 15:13:15 up 66 days, 3:45, 8 users, load average: 1.84, 1.59, 1.57 Tasks: 830 total, 1 running, 828 sleeping, 0 stopped, 1 zombie Cpu(s): 3.4%us, 0.7%sy, 0.0%ni, 81.7%id, 14.2%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 32830016k total, 32142596k used, 687420k free, 77460k buffers Swap: 8190972k total, 204196k used, 7986776k free, 27981268k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 30639 postgres 20 0 10.5g 4.7g 4.7g S 13.5 14.9 10:20.95 postgres 18185 postgres 20 0 10.5g 603m 596m S 4.9 1.9 2:51.16 postgres 16543 postgres 20 0 10.5g 2.8g 2.8g S 4.3 8.8 1:34.04 postgres 14710 postgres 20 0 10.5g 2.9g 2.9g S 3.9 9.2 1:20.84 postgres 1214 root 20 0 15668 1848 896 S 1.0 0.0 130:46.43 top 13462 postgres 20 0 10.5g 1.4g 1.3g S 1.0 4.3 0:25.56 postgres 20081 root 20 0 15668 1880 936 R 1.0 0.0 0:00.12 top 13478 postgres 20 0 10.5g 2.1g 2.1g S 0.7 6.9 0:56.43 postgres 41107 root 20 0 416m 10m 4892 S 0.7 0.0 305:25.71 pgadmin3 2680 root 20 0 0 0 0 S 0.3 0.0 103:38.54 nfsiod 3558 root 20 0 13688 1100 992 S 0.3 0.0 45:00.36 gam_server 15576 root 20 0 0 0 0 S 0.3 0.0 0:01.16 flush-253:1 18430 postgres 20 0 10.5g 18m 13m S 0.3 0.1 0:00.64 postgres 20083 postgres 20 0 105m 1852 1416 S 0.3 0.0 0:00.01 bash 24188 postgres 20 0 102m 1856 832 S 0.3 0.0 0:23.39 sshd 28250 postgres 20 0 156m 1292 528 S 0.3 0.0 0:46.86 postgres 1 root 20 0 19356 1188 996 S 0.0 0.0 0:05.00 init Regards, Dinesh Chandra |Database administrator (Oracle/PostgreSQL)| ________________________________ DISCLAIMER: This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. 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