How can this bad query be improved?
Db:11.2.0.3
We have a 3rd party app and the web app runs very slow. We want to make the 3rd party to fix the issue. for the
app login process, I did an AWR , found the problem query it runs 10 mins. Then I did the sqltrace
here is it:
select clndr_id , count(*)
from
task where (clndr_id = :"SYS_B_0") group by clndr_id union select clndr_id ,
count(*) from project where (clndr_id = :"SYS_B_1") group by clndr_id
call count cpu elapsed disk query current rows
Parse 1 0.01 0.00 0 0 0 0
Execute 1 0.01 0.00 0 0 0 0
Fetch 2 53.32 612.03 81650 58920 0 2
total 4 53.34 612.04 81650 58920 0 2
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 34 (PX)
Number of plan statistics captured: 1
Rows (1st) Rows (avg) Rows (max) Row Source Operation
2 2 2 SORT UNIQUE (cr=58923 pr=81650 pw=22868 time=113329109 us cost=58277 size=24 card=2)
2 2 2 UNION-ALL (cr=58923 pr=81650 pw=22868 time=113329001 us)
1 1 1 SORT GROUP BY NOSORT (cr=58330 pr=81070 pw=22868 time=104312437 us cost=58128 size=7 card=1)
5589739 5589739 5589739 VIEW index$_join$_003 (cr=58330 pr=81070 pw=22868 time=619784236 us cost=57240 size=38875249 card=5553607)
5589739 5589739 5589739 HASH JOIN (cr=58330 pr=81070 pw=22868 time=617373467 us)
5590158 5590158 5590158 INDEX RANGE SCAN NDX_TASK_CALENDAR (cr=21676 pr=21676 pw=0 time=113637058 us cost=11057 size=38875249 card=5553607)(object id 24749)
6673774 6673774 6673774 INDEX FAST FULL SCAN NDX_TASK_PROJ_RSRC (cr=36651 pr=36526 pw=0 time=213370625 us cost=21921 size=38875249 card=5553607)(object id 217274)
1 1 1 SORT GROUP BY NOSORT (cr=593 pr=580 pw=0 time=9016527 us cost=149 size=17 card=1)
136390 136390 136390 INDEX FAST FULL SCAN NDX_PROJECT_CALENDAR (cr=593 pr=580 pw=0 time=165434 us cost=132 size=2315876 card=136228)(object id 154409)
Rows Execution Plan
0 SELECT STATEMENT MODE: ALL_ROWS
2 SORT (UNIQUE)
2 UNION-ALL
1 SORT (GROUP BY NOSORT)
5589739 TABLE ACCESS MODE: ANALYZED (BY INDEX ROWID) OF 'TASK'
(TABLE)
5589739 INDEX MODE: ANALYZED (RANGE SCAN) OF
'NDX_TASK_CALENDAR' (INDEX)
5590158 SORT (GROUP BY NOSORT)
6673774 INDEX MODE: ANALYZED (RANGE SCAN) OF
'NDX_PROJECT_CALENDAR' (INDEX)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 2 0.00 0.00
Disk file operations I/O 2 0.00 0.00
db file sequential read 22235 1.61 138.66
direct path write 1620 3.25 177.42
db file scattered read 2313 1.89 238.98
direct path read 385 1.72 19.52
SQL*Net message from client 2 0.11 0.21Please make your comments.
Thanks in Advance.
Salman Qureshi wrote:
Hi,
It looks to me that end result will give you distinct values because of distinct clndr_id. If my thinking is correct, can you use UNION ALL istead of UNION? This will reduce your query execution time by not spending time on removing duplication of results (UNION removes duplication).
Do you have fresh statistics on the tables/indexes involved in this query?
SalmanIt is a 3rd party app, not sure the query is exactly doing for, a good input though,
I have given a try as comparison.
Found
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
UNION
select clndr_id , count(*)
from
task where (clndr_id = :"SYS_B_0") group by clndr_id union select clndr_id ,
count(*) from project where (clndr_id = :"SYS_B_1") group by clndr_id
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 2 31.18 70.39 25288 58920 0 2
total 4 31.18 70.39 25288 58920 0 2
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 34 (PX)
Number of plan statistics captured: 1
Rows (1st) Rows (avg) Rows (max) Row Source Operation
2 2 2 SORT UNIQUE (cr=58923 pr=25288 pw=25284 time=70390927 us cost=58277 size=24 card=2)
2 2 2 UNION-ALL (cr=58923 pr=25288 pw=25284 time=70390652 us)
1 1 1 SORT GROUP BY NOSORT (cr=58330 pr=25288 pw=25284 time=70309151 us cost=58128 size=7 card=1)
5589739 5589739 5589739 VIEW index$_join$_003 (cr=58330 pr=25288 pw=25284 time=70027453 us cost=57240 size=38875249 card=5553607)
5589739 5589739 5589739 HASH JOIN (cr=58330 pr=25288 pw=25284 time=68083254 us)
5590158 5590158 5590158 INDEX RANGE SCAN NDX_TASK_CALENDAR (cr=21676 pr=0 pw=0 time=2449897 us cost=11057 size=38875249 card=5553607)(object id 24749)
6673774 6673774 6673774 INDEX FAST FULL SCAN NDX_TASK_PROJ_RSRC (cr=36651 pr=0 pw=0 time=3097204 us cost=21921 size=38875249 card=5553607)(object id 217274)
1 1 1 SORT GROUP BY NOSORT (cr=593 pr=0 pw=0 time=81462 us cost=149 size=17 card=1)
136390 136390 136390 INDEX FAST FULL SCAN NDX_PROJECT_CALENDAR (cr=593 pr=0 pw=0 time=68732 us cost=132 size=2315876 card=136228)(object id 154409)
Rows Execution Plan
0 SELECT STATEMENT MODE: ALL_ROWS
2 SORT (UNIQUE)
2 UNION-ALL
1 SORT (GROUP BY NOSORT)
5589739 TABLE ACCESS MODE: ANALYZED (BY INDEX ROWID) OF 'TASK'
(TABLE)
5589739 INDEX MODE: ANALYZED (RANGE SCAN) OF
'NDX_TASK_CALENDAR' (INDEX)
5590158 SORT (GROUP BY NOSORT)
6673774 INDEX MODE: ANALYZED (RANGE SCAN) OF
'NDX_PROJECT_CALENDAR' (INDEX)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 2 0.00 0.00
direct path write 3347 1.59 43.26
direct path read 130 0.20 0.32
SQL*Net message from client 2 0.23 0.27
********************************************************************************$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
UNION ALL
SQL ID: d6z3ag876m67h Plan Hash: 4277397671
select clndr_id , count(*)
from
task where (clndr_id = :"SYS_B_0") group by clndr_id union all select
clndr_id , count(*) from project where (clndr_id = :"SYS_B_1") group by
clndr_id
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.01 0.00 0 0 0 0
Fetch 2 31.77 89.93 22886 58920 0 2
total 4 31.78 89.94 22886 58920 0 2
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 34 (PX)
Number of plan statistics captured: 1
Rows (1st) Rows (avg) Rows (max) Row Source Operation
2 2 2 UNION-ALL (cr=58932 pr=22887 pw=22868 time=89865448 us)
1 1 1 SORT GROUP BY NOSORT (cr=58339 pr=22887 pw=22868 time=89865428 us cost=57240 size=7 card=1)
5589739 5589739 5589739 VIEW index$_join$_003 (cr=58339 pr=22887 pw=22868 time=302390812 us cost=57240 size=38875249 card=5553607)
5589739 5589739 5589739 HASH JOIN (cr=58339 pr=22887 pw=22868 time=300505731 us)
5590158 5590158 5590158 INDEX RANGE SCAN NDX_TASK_CALENDAR (cr=21676 pr=0 pw=0 time=2275780 us cost=11057 size=38875249 card=5553607)(object id 24749)
6673774 6673774 6673774 INDEX FAST FULL SCAN NDX_TASK_PROJ_RSRC (cr=36651 pr=18 pw=0 time=3233656 us cost=21921 size=38875249 card=5553607)(object id 217274)
1 1 1 SORT GROUP BY NOSORT (cr=593 pr=0 pw=0 time=77989 us cost=132 size=17 card=1)
136390 136390 136390 INDEX FAST FULL SCAN NDX_PROJECT_CALENDAR (cr=593 pr=0 pw=0 time=55006 us cost=132 size=2315876 card=136228)(object id 154409)
Rows Execution Plan
0 SELECT STATEMENT MODE: ALL_ROWS
2 UNION-ALL
1 SORT (GROUP BY NOSORT)
5589739 TABLE ACCESS MODE: ANALYZED (BY INDEX ROWID) OF 'TASK'
(TABLE)
5589739 INDEX MODE: ANALYZED (RANGE SCAN) OF 'NDX_TASK_CALENDAR'
(INDEX)
5590158 SORT (GROUP BY NOSORT)
6673774 INDEX MODE: ANALYZED (RANGE SCAN) OF
'NDX_PROJECT_CALENDAR' (INDEX)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 2 0.00 0.00
Disk file operations I/O 2 0.00 0.00
direct path write 2069 3.12 58.90
db file sequential read 18 0.78 4.35
direct path read 22 0.12 0.15
SQL*Net message from client 2 0.46 0.71
********************************************************************************found union all used 90s vs union 70s, and the logic and the physical reads are about the same.
Notice that we now have it ran less that 2 mins for the query vs 10 mins before.
The before was at the peak hrs and now it is off the peak. the disk read from peak's 81650 reduced to 22886.
that was the cause of slow -- I/O contentions at peak hrs.
How can we improve the query performance by increasing disk throughput?
SQL> show parameter mem
NAME TYPE VALUE
hi_shared_memory_address integer 0
memory_max_target big integer 4000M
memory_target big integer 3600M
shared_memory_address integer 0
SQL> show parameter db_b
NAME TYPE VALUE
db_block_buffers integer 0
db_block_checking string FALSE
db_block_checksum string TYPICAL
db_block_size integer 8192
SQL>
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