What happens if 100 querys hits database at one time?

Question

I have sever problem. I have java application and having conection pool upto 150. Let's say from the application my database get hit by 100 connection AT A TIME.
my cpu goes 99%.
Now my question is how can i get better performance out of this.
Assumtions: all queries are well written, net work is good
Expected solution: May trying increasing SGA size would increaase some performance?
I heard some thing about doing parralle queries. what 's that?
Thanks in advance.

Answer 1

I just ran my programme for one session and here is a trace for one session...
Sorry if i am violating this forum rule by posting a big log....
TKPROF: Release 10.2.0.1.0 - Production on Thu Dec 21 15:44:04 2006
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
Trace file: j.txt
Sort options: default
count    = number of times OCI procedure was executed
cpu      = cpu time in seconds executing
elapsed  = elapsed time in seconds executing
disk     = number of physical reads of buffers from disk
query    = number of buffers gotten for consistent read
current  = number of buffers gotten in current mode (usually for update)
rows     = number of rows processed by the fetch or execute call
call fl_trans.validate_city(:1,:2,:3,:4,:5,:6)
call     count       cpu    elapsed       disk      query    current        rows
Parse       36      0.00       0.00          0          0          0           0
Execute     36      0.10       0.13          2        526          0           0
Fetch        0      0.00       0.00          0          0          0           0
total       72      0.10       0.13          2        526          0           0
Misses in library cache during parse: 1
Misses in library cache during execute: 1
Optimizer mode: ALL_ROWS
Parsing user id: 70 
Elapsed times include waiting on following events:
  Event waited on                             Times   Max. Wait  Total Waited
  ----------------------------------------   Waited  ----------  ------------
  SQL*Net message to client                      36        0.00          0.00
  SQL*Net message from client                    36        0.00          0.04
select /*+ index(idl_sb4$ i_idl_sb41) +*/ piece#,length,piece
from
idl_sb4$ where obj#=:1 and part=:2 and version=:3 order by piece#
call     count       cpu    elapsed       disk      query    current        rows
Parse        6      0.00       0.00          0          0          0           0
Execute      6      0.00       0.00          0          0          0           0
Fetch       16      0.00       0.00          0         42          0          10
total       28      0.00       0.00          0         42          0          10
Misses in library cache during parse: 1
Misses in library cache during execute: 1
Optimizer mode: CHOOSE
Parsing user id: SYS   (recursive depth: 1)
Rows     Row Source Operation
      2  TABLE ACCESS BY INDEX ROWID IDL_SB4$ (cr=6 pr=0 pw=0 time=88 us)
      2   INDEX RANGE SCAN I_IDL_SB41 (cr=4 pr=0 pw=0 time=61 us)(object id 117)
select /*+ index(idl_ub1$ i_idl_ub11) +*/ piece#,length,piece
from
idl_ub1$ where obj#=:1 and part=:2 and version=:3 order by piece#
call     count       cpu    elapsed       disk      query    current        rows
Parse        6      0.00       0.00          0          0          0           0
Execute      6      0.00       0.00          0          0          0           0
Fetch       15      0.00       0.00          0         46          0          11
total       27      0.00       0.00          0         46          0          11
Misses in library cache during parse: 1
Misses in library cache during execute: 1
Optimizer mode: CHOOSE
Parsing user id: SYS   (recursive depth: 1)
Rows     Row Source Operation
      1  TABLE ACCESS BY INDEX ROWID IDL_UB1$ (cr=4 pr=0 pw=0 time=93 us)
      1   INDEX RANGE SCAN I_IDL_UB11 (cr=3 pr=0 pw=0 time=57 us)(object id 114)
select /*+ index(idl_char$ i_idl_char1) +*/ piece#,length,piece
from
idl_char$ where obj#=:1 and part=:2 and version=:3 order by piece#
call     count       cpu    elapsed       disk      query    current        rows
Parse        6      0.00       0.00          0          0          0           0
Execute      6      0.00       0.00          0          0          0           0
Fetch       10      0.00       0.00          0         23          0           4
total       22      0.00       0.00          0         23          0           4
Misses in library cache during parse: 1
Misses in library cache during execute: 1
Optimizer mode: CHOOSE
Parsing user id: SYS   (recursive depth: 1)
Rows     Row Source Operation
      1  TABLE ACCESS BY INDEX ROWID IDL_CHAR$ (cr=4 pr=0 pw=0 time=73 us)
      1   INDEX RANGE SCAN I_IDL_CHAR1 (cr=3 pr=0 pw=0 time=50 us)(object id 115)
select /*+ index(idl_ub2$ i_idl_ub21) +*/ piece#,length,piece
from
idl_ub2$ where obj#=:1 and part=:2 and version=:3 order by piece#
call     count       cpu    elapsed       disk      query    current        rows
Parse        6      0.00       0.00          0          0          0           0
Execute      6      0.00       0.00          0          0          0           0
Fetch       11      0.00       0.00          0         37          0           9
total       23      0.00       0.00          0         37          0           9
Misses in library cache during parse: 1     
Misses in library cache during execute: 1
Optimizer mode: CHOOSE
Parsing user id: SYS   (recursive depth: 1)
Rows     Row Source Operation
      2  TABLE ACCESS BY INDEX ROWID IDL_UB2$ (cr=5 pr=0 pw=0 time=100 us)
      2   INDEX RANGE SCAN I_IDL_UB21 (cr=3 pr=0 pw=0 time=65 us)(object id 116)
SELECT INITCAP(CITY),UPPER(STATE),ZIP
FROM
US_CITIES WHERE (CITY = :B2 AND STATE = :B1 )
call     count       cpu    elapsed       disk      query    current        rows
Parse        0      0.00       0.00          0          0          0           0
Execute     72      0.01       0.00          0          0          0           0
Fetch       72      0.00       0.02          2        144          0           0
total      144      0.01       0.03          2        144          0           0
Misses in library cache during parse: 0     
Misses in library cache during execute: 1
Optimizer mode: ALL_ROWS
Parsing user id: 70     (recursive depth: 1)
Elapsed times include waiting on following events:
  Event waited on                             Times   Max. Wait  Total Waited
  ----------------------------------------   Waited  ----------  ------------
  db file sequential read                         2        0.02          0.02
SELECT INITCAP(CITY_NAME),UPPER(STATE),ZIP_CODE
FROM
US_ZIP_CODES WHERE (ZIP_CODE = :B1 )
call     count       cpu    elapsed       disk      query    current        rows
Parse        0      0.00       0.00          0          0          0           0
Execute     72      0.00       0.00          0          0          0           0
Fetch      144      0.00       0.00          0        216          0          72
total      216      0.01       0.01          0        216          0          72
Misses in library cache during parse: 0
Misses in library cache during execute: 1
Optimizer mode: ALL_ROWS
Parsing user id: 70     (recursive depth: 1)
BEGIN fl_trans_test.truck_search_new  (:1,:2,:3,:4,:5,:6,:7,:8,:9,:10,:11,:12,
  :13,:14,:15,:16,:17) ; END;
call     count       cpu    elapsed       disk      query    current        rows
Parse       36      0.00       0.00          0          0          0           0
Execute     36      0.07       0.07          0        240          0          36
Fetch        0      0.00       0.00          0          0          0           0
total       72      0.07       0.07          0        240          0          36
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 70
Elapsed times include waiting on following events:
  Event waited on                             Times   Max. Wait  Total Waited
  ----------------------------------------   Waited  ----------  ------------
  SQL*Net message to client                      36        0.00          0.00
  SQL*Net message from client                    36        0.00          0.04
SELECT LONGITUDE,LATITUDE
FROM
US_ZIP_CODES WHERE ZIP_CODE = :B1
call     count       cpu    elapsed       disk      query    current        rows
Parse        0      0.00       0.00          0          0          0           0
Execute     72      0.01       0.00          0          0          0           0
Fetch       72      0.00       0.00          0        216          0          72
total      144      0.01       0.01          0        216          0          72
Misses in library cache during parse: 0
Misses in library cache during execute: 1
Optimizer mode: ALL_ROWS   
Parsing user id: 70     (recursive depth: 1)
SELECT A.FROM_CITY ,FROM_ST, DEST_CITY, DECODE (DEST_ST, NULL, ' ', DEST_ST),
  EQUIP_TYPE, DECODE (NOTE1, NULL, ' ', NOTE1), DECODE (NOTE2, NULL, ' ',
  NOTE2), FULL_OR_PARTIAL, DECODE (LD_REF_NO, NULL, ' ', LD_REF_NO), LD_COUNT,
   WEIGHT, EQUIP_LENGTH, A.COMPANY_NM, PHONE1, PHONE2, STATE, MC_NO,
  CREDITOR1, CREDITOR2, DECODE (:B11 , 'Z',
  TO_CHAR(FL_TRANS_TEST.CALC_DISTANCE_BY_LATI_LONG(FROM_ZIP_LONGITUDE,
  FROM_ZIP_LATITUDE, :B14 ,:B13 )), '--' ) AS F_DIST, DECODE
  (POSTED_BY_ZIP_OR_ST_ZONE, 'N', '--', DECODE (:B7 , 'Z', TO_CHAR
  (FL_TRANS_TEST.CALC_DISTANCE_BY_LATI_LONG(FROM_ZIP_LONGITUDE,
  FROM_ZIP_LATITUDE, :B14 ,:B13 )), '--' ) ) AS T_DIST, DECODE
  (POSTED_BY_ZIP_OR_ST_ZONE, 'N', '--',
  FL_TRANS_TEST.CALC_DISTANCE_BY_LATI_LONG(FROM_ZIP_LONGITUDE,
  FROM_ZIP_LATITUDE, DEST_ZIP_LONGITUDE,DEST_ZIP_LATITUDE) ) AS DISTANCE,
  AVAILABLE_DATE, TO_CHAR (EXEC_TIME_STAMP, 'YYYY-MM-DD HH24:MI:SS') AS
  TIME_STAMP, RATE  
FROM
FL_TK_POSTING A WHERE A.USER_NAME <> :B15 AND ( ( ( ( A.FROM_ZIP_LONGITUDE   
  BETWEEN :B14 -:B12 AND :B14 +:B12 AND A.FROM_ZIP_LATITUDE BETWEEN :B13     
  -:B12 AND :B13 +:B12 ) ) AND (:B11 = 'Z') ) OR ( UPPER(A.FROM_ST) IN (      
  SELECT UPPER(C.ZONE_STATE) FROM US_ZONES C WHERE ( ZONE_STATE IN (SUBSTR
  (:B16 , 1, 2), SUBSTR (:B16 , 3, 2), SUBSTR (:B16 , 5, 2), SUBSTR (:B16 , 7,
   2), SUBSTR (:B16 , 9, 2), SUBSTR (:B16 , 11, 2), SUBSTR (:B16 , 13, 2) )
  OR ZONE IN (SUBSTR (:B16 , 1, 2), SUBSTR (:B16 , 3, 2), SUBSTR (:B16 , 5, 2)
  , SUBSTR (:B16 , 7, 2), SUBSTR (:B16 , 9, 2), SUBSTR (:B16 , 11, 2), SUBSTR
  (:B16 , 13, 2) ) ) ) AND (:B11 = 'N') ) ) AND ( ( A.DEST_ZIP_LONGITUDE
  BETWEEN :B10 -:B8 AND :B10 +:B8 AND A.DEST_ZIP_LATITUDE BETWEEN :B9 -:B8
  AND :B9 +:B8 AND (:B7 = 'Z')) OR (( :B6 IN ( SELECT D.ZONE_STATE FROM
  US_ZONES D WHERE ( D.ZONE_STATE IN (LOWER (A.DEST_ST), TK_POST_ST1, 
  TK_POST_ST2, TK_POST_ST3, TK_POST_ST4, TK_POST_ST5, TK_POST_ST6,
  TK_POST_ST7, TK_POST_ST8 ) OR ZONE IN (TK_POST_A0, TK_POST_A1, TK_POST_A2,
  TK_POST_A3, TK_POST_A4, TK_POST_A5, TK_POST_A6, TK_POST_A7, TK_POST_A8 ) ))
  ) AND (POSTED_BY_ZIP_OR_ST_ZONE = 'N')) OR ( 1 >= ( SELECT MIN(ROWNUM) FROM
  US_ZONES C , US_ZONES D WHERE ( C.ZONE_STATE IN (SUBSTR (:B17 , 1, 2),
  SUBSTR (:B17 , 3, 2), SUBSTR (:B17 , 5, 2), SUBSTR (:B17 , 7, 2), SUBSTR
  (:B17 , 9, 2), SUBSTR (:B17 , 11, 2), SUBSTR (:B17 , 13, 2) ) OR C.ZONE IN
  (SUBSTR (:B17 , 1, 2), SUBSTR (:B17 , 3, 2), SUBSTR (:B17 , 5, 2), SUBSTR
  (:B17 , 7, 2), SUBSTR (:B17 , 9, 2), SUBSTR (:B17 , 11, 2), SUBSTR (:B17 ,
  13, 2) ) ) AND ( D.ZONE_STATE IN (LOWER (A.DEST_ST), TK_POST_ST1,
  TK_POST_ST2, TK_POST_ST3, TK_POST_ST4, TK_POST_ST5, TK_POST_ST6,
  TK_POST_ST7, TK_POST_ST8 ) OR D.ZONE IN (TK_POST_A0, TK_POST_A1, TK_POST_A2,
   TK_POST_A3, TK_POST_A4, TK_POST_A5, TK_POST_A6, TK_POST_A7, TK_POST_A8 ) )
  AND C.ZONE_STATE = D.ZONE_STATE ) ) ) AND (DECODE (:B5 , 'A',
  FULL_OR_PARTIAL) IN ('F', 'P') OR FULL_OR_PARTIAL = :B5 ) AND ( DECODE
  (LTRIM (RTRIM (:B4 )), 'Auto Carrier', EQUIP_TYPE_INDEX) IN (0) OR DECODE
  (LTRIM (RTRIM (:B4 )), 'B - Train', EQUIP_TYPE_INDEX) IN (1) OR DECODE
  (LTRIM (RTRIM (:B4 )), 'Container', EQUIP_TYPE_INDEX) IN (2) OR DECODE
  (LTRIM (RTRIM (:B4 )), 'Double Drop', EQUIP_TYPE_INDEX) IN (3) OR DECODE
  (LTRIM (RTRIM (:B4 )), 'Dump Truck', EQUIP_TYPE_INDEX) IN (4) OR DECODE
  (LTRIM (RTRIM (:B4 )), 'Flatbed Hazmat', EQUIP_TYPE_INDEX) IN (7) OR DECODE
  (LTRIM (RTRIM (:B4 )), 'Reefer Hazmat', EQUIP_TYPE_INDEX) IN (9) OR DECODE
  (LTRIM (RTRIM (:B4 )), 'Step Deck', EQUIP_TYPE_INDEX) IN (10, 5, 6) OR
  DECODE (LTRIM (RTRIM (:B4 )), 'Tanker', EQUIP_TYPE_INDEX) IN (11) OR DECODE
  (LTRIM (RTRIM (:B4 )), 'Van Hazmat', EQUIP_TYPE_INDEX) IN (14) OR DECODE
  (LTRIM (RTRIM (:B4 )), 'Power Only', EQUIP_TYPE_INDEX) = 17 OR DECODE
  (LTRIM (RTRIM (:B4 )), 'Van', EQUIP_TYPE_INDEX) IN (12, 13, 15, 14) OR
  DECODE (LTRIM (RTRIM (:B4 )), 'Van Air-Ride', EQUIP_TYPE_INDEX) IN (12, 13,
  15, 14) OR DECODE (LTRIM (RTRIM (:B4 )), 'Vented Van', EQUIP_TYPE_INDEX) IN
  (16, 8, 15) OR DECODE (LTRIM (RTRIM (:B4 )), 'Reefer', EQUIP_TYPE_INDEX) IN
  (15, 8, 9) OR DECODE (LTRIM (RTRIM (:B4 )), 'Van Or Reefer',
  EQUIP_TYPE_INDEX) IN (12, 16, 8, 15, 14, 9) OR DECODE (LTRIM (RTRIM (:B4 )),
   'Flatbed', EQUIP_TYPE_INDEX) IN (5, 6, 10, 7) OR DECODE (LTRIM (RTRIM (:B4
  )), 'Flatbed Air-Ride', EQUIP_TYPE_INDEX) IN (5, 6, 7) OR DECODE (LTRIM
  (RTRIM (:B4 )), 'Other (see Notes)', EQUIP_TYPE_INDEX ) = 18 ) AND
  EQUIP_LENGTH <= :B3 AND WEIGHT <= :B2 AND ROWNUM < 201 AND
  A.USR_POSTING_POS > -2 AND EXEC_TIME_STAMP >= SYSDATE - ((.041667)*:B1 )
call     count       cpu    elapsed       disk      query    current        rows
Parse       36      0.00       0.00          0          0          0           0
Execute     36      0.03       0.03          0          0          0           0
Fetch       36      0.49       0.48          0       3469          0          72
total      108      0.53       0.52          0       3469          0          72
Misses in library cache during parse: 1
Misses in library cache during execute: 1
Optimizer mode: ALL_ROWS
Parsing user id: 70
Rows     Row Source Operation
      2  COUNT STOPKEY (cr=97 pr=0 pw=0 time=8440 us)
      2   FILTER  (cr=97 pr=0 pw=0 time=8424 us)
   1014    TABLE ACCESS BY INDEX ROWID FL_TK_POSTING (cr=50 pr=0 pw=0 time=15320 us)
   1296     INDEX RANGE SCAN IX_TK_POST_EXEC_TIME_STAMP (cr=5 pr=0 pw=0 time=3962 us)(object id 81233)
      0    INDEX FULL SCAN PK_US_ZONES (cr=0 pr=0 pw=0 time=0 us)(object id 81106)
      1    INDEX RANGE SCAN PK_US_ZONES (cr=16 pr=0 pw=0 time=411 us)(object id 81106)
     15    SORT AGGREGATE (cr=31 pr=0 pw=0 time=2277 us)
      0     COUNT  (cr=31 pr=0 pw=0 time=2042 us)
      0      NESTED LOOPS  (cr=31 pr=0 pw=0 time=1872 us)
     30       INDEX FULL SCAN PK_US_ZONES (cr=15 pr=0 pw=0 time=679 us)(object id 81106)
      0       INDEX RANGE SCAN PK_US_ZONES (cr=16 pr=0 pw=0 time=661 us)(object id 81106)
Elapsed times include waiting on following events:
  Event waited on                             Times   Max. Wait  Total Waited
  ----------------------------------------   Waited  ----------  ------------
  SQL*Net message to client                      36        0.00          0.00
  SQL*Net message from client                    35        4.86        170.13
OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
call     count       cpu    elapsed       disk      query    current        rows
Parse      108      0.01       0.01          0          0          0           0
Execute    108      0.21       0.23          2        766          0          36
Fetch       36      0.49       0.48          0       3469          0          72
total      252      0.72       0.74          2       4235          0         108
Misses in library cache during parse: 2
Misses in library cache during execute: 2
Elapsed times include waiting on following events:
  Event waited on                             Times   Max. Wait  Total Waited
  ----------------------------------------   Waited  ----------  ------------
  SQL*Net message to client                      72        0.00          0.00 
  SQL*Net message from client                   107        4.86        170.22 
OVERALL TOTALS FOR ALL RECURSIVE STATEMENTS 
call     count       cpu    elapsed       disk      query    current        rows
Parse       24      0.01       0.01          0          0          0           0
Execute    240      0.05       0.03          0          0          0           0
Fetch      340      0.01       0.03          2        724          0         178
total      604      0.07       0.08          2        724          0         178
Misses in library cache during parse: 4
Misses in library cache during execute: 7
Elapsed times include waiting on following events:
  Event waited on                             Times   Max. Wait  Total Waited
  ----------------------------------------   Waited  ----------  ------------
  db file sequential read                         2        0.02          0.02
  SQL*Net message to client                      36        0.00          0.00
  114  user  SQL statements in session.
   24  internal SQL statements in session.
  138  SQL statements in session.
Trace file: j.txt
Trace file compatibility: 10.01.00
Sort options: default
       1  session in tracefile.
     114  user  SQL statements in trace file.
      24  internal SQL statements in trace file.
     138  SQL statements in trace file.
      10  unique SQL statements in trace file.
    2164  lines in trace file.
     170  elapsed seconds in trace file.