How should I optimize this query
Hi
I have following query
SELECT /*+ USE_HASH (bp,rp) */ TO_CHAR (part_name)
FROM base_part bp,risk_assessment_part rp
WHERE bp.part_number = rp.part_number and risk_activity_code = 1
Explain Plan for this is
SELECT STATEMENT Optimizer Mode=CHOOSE
NESTED LOOPS
TABLE ACCESS FULL GQTS6USER.BASE_PART ROWS 4M , BYTES 331M, COST 7731
INDEX UNIQUE SCAN GQTS6USER.XPK_RISK_ASSESSMENT_PART ROWS 1, BYTES 22
Is there any way to optimize qry execution time???
Make sure you have indexes on the columns used in join and filter conditions. Gather current statistics. Remove the TO_CHAR. Test the query with and without the hint and compare times and execution plans. Bear in mind the optimizer may choose to ignore a hint if it determines that there is a better plan.
Similar Messages
-
Can anyone tell me how can i optimize this query...
Can anyone tell me how can i optimize this query ??? :
Select Distinct eopersona.numident From rscompeten , rscompet , rscv , eopersona , rscurso , rseduca , rsexplab , rsinteres
Where ( ( (LOWER (rscompeten.nombre LIKE '%caracas%') AND ( rscompeten.id = rscompet.idcompeten ) AND ( rscv.id = rscompet.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rscurso.nombre) LIKE '%caracas%') AND ( rscv.id = rscurso.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rscurso.lugar) LIKE '%caracas%') AND ( rscv.id = rscurso.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rseduca.univinst) LIKE '%caracas%)' AND ( rscv.id = rseduca.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rsexplab.nombempre) LIKE '%caracas%' AND ( rscv.id = rsexplab.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rsinteres.descrip) LIKE '%caracas%' AND ( rscv.id = rsinteres.idcv ) AND ( eopersona.id = rscv.idpersona ) )
OR ( (LOWER (rscv.cargoasp) LIKE '%caracas%' AND ( eopersona.id = rscv.idpersona ) )
OR ( LOWER (eopersona.ciudad) LIKE '%caracas%' AND ( eopersona.id = rscv.idpersona )
PLEASE IF YOU FIND SOMETHING WRONG.. PLEASE HELP ME.. this query takes me aproximatelly 10 minutes and the database is really small ( with only 200 records on each table )You are querying eight tables, however in any of your OR predicates you're only restricting 3 or 4 of those tables. That means that the remaining 4 or 5 tables are generating cartesian products. (n.b. the cartesian product of 5 tables with 200 rows each results in g 200^5 = 320,000,000,000 rows) Then you casually hide this behind "distinct".
A simple restatement of your requirements looks like this:
Select eopersona.numident
From rscompeten,
rscompet,
rscv,
eopersona
Where LOWER (rscompeten.nombre) LIKE '%caracas%'
AND rscompeten.id = rscompet.idcompeten
AND rscv.id = rscompet.idcv
AND eopersona.id = rscv.idpersona
UNION
Select eopersona.numident
From rscurso ,
rscv,
eopersona
Where LOWER (rscurso.nombre) LIKE '%caracas%'
AND rscv.id = rscurso.idcv
AND eopersona.id = rscv.idpersona
UNION
Select eopersona.numident
From rscurso ,
rscv,
eopersona
Where LOWER (rscurso.lugar) LIKE '%caracas%'
AND rscv.id = rscurso.idcv
AND eopersona.id = rscv.idpersona
UNION
...From there you can eliminate redundancies as desired, but I imagine that the above will perform admirably with the data volumes you describe. -
SELECT c1,c2 FROM tabla WHERE c1=(SELECT MIN(c1) FROM tabla)
(i want to get an unique register which contains the minimum value in the table for the field c1)C1 C2
1 -1
2 -2
3 -3
4 -4
5 -5
6 -6
7 -7
8 -8
9 -9
10 -10
10 rijen zijn geselecteerd.
SQL>
SQL> SELECT c1,c2 FROM tabla WHERE c1=(SELECT MIN(c1) FROM tabla)
2 /
C1 C2
1 -1
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 FILTER
2 1 TABLE ACCESS (FULL) OF 'TABLA'
3 1 SORT (AGGREGATE)
4 3 TABLE ACCESS (FULL) OF 'TABLA'
SQL>
SQL> SELECT c1,c2
2 FROM
3 (
4 SELECT c1,c2, ROW_NUMBER() OVER (ORDER BY C1) RN
5 FROM tabla
6 )
7 WHERE RN = 1
8 /
C1 C2
1 -1
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 VIEW
2 1 WINDOW (SORT PUSHED RANK)
3 2 TABLE ACCESS (FULL) OF 'TABLA'
SQL>
SQL> select min(c1) keep (dense_rank first order by c1) c1
2 , min(c2) keep (dense_rank first order by c1) c2
3 from tabla
4 /
C1 C2
1 -1
Execution Plan
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 SORT (AGGREGATE)
2 1 TABLE ACCESS (FULL) OF 'TABLA'Regards,
Rob. -
How can I optimize this query's performance
SELECT pu.user_id,
cd.owner,
cd.somedata
FROM client_detail cd,
client_detail_user_xref pu
WHERE cd.device_id = 'xxxxxxxxx'
AND cd.client_detail_id = pu.client_detail_id(+)
AND(cd.alt_user_id = '12345' OR pu.user_id = '67890')
Plan hash value: 3532311591
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 247 | 1374 (1)| 00:00:17 |
|* 1 | FILTER | | | | | |
| 2 | NESTED LOOPS OUTER | | 1 | 247 | 1374 (1)| 00:00:17 |
|* 3 | TABLE ACCESS FULL | CLIENT_DETAIL | 1 | 226 | 1371 (1)| 00:00:17 |
| 4 | TABLE ACCESS BY INDEX ROWID| CLIENT_DETAIL_USER_XREF | 1 | 21 | 3 (0)| 00:00:01 |
|* 5 | INDEX RANGE SCAN | CLIENT_DETAIL_USER_PK | 1 | | 2 (0)| 00:00:01 |
Predicate Information (identified by operation id):
1 - filter("CD"."ALT_USER_ID"='12345' OR "PU"."USER_ID"='67890')
3 - filter("CD"."DEVICE_ID"='xxxxxxxxx')
5 - access("CD"."CLIENT_DETAIL_ID"="PU"."CLIENT_DETAIL_ID"(+))
Edited by: user13805875 on Feb 24, 2011 5:13 AMIf you are posting a Performance Related Question. Please read
{thread:id=501834} and {thread:id=863295}.
Following those guide will be very helpful. -
How I can optimize this SQL query
I require your help, I want to know how I can optimize this query
SELECT
"F42119". "SDLITM" as "Code1"
"F42119". "SDAITM" as "Code2"
"F42119". "SDDSC1" as "Product"
"F42119". "SDMCU" as "Bodega"
Sum ("F42119". "SDSOQS" / 10000) as "Number",
Sum ("F42119". "SDUPRC" / 10000) as "preciou"
Sum ("F42119". "SDAEXP" / 100) as "Value",
Sum ("F42119". "SDUNCS" / 10000) as "CostoU"
Sum ("F42119". "SDECST" / 100) as "Cost"
"F4101". "IMSRP1" as "Division"
"F4101". "IMSRP2" as "classification",
"F4101". "IMSRP8" as "Brand"
"F4101". "IMSRP9" as "Aroma"
"F4101". "IMSRP0" as "Presentation"
"F42119". "SDDOC" as "Type",
"F42119". "SDDCT" as "Document",
"F42119". "SDUOM" as "Unit"
"F42119". "SDCRCD" as "currency"
"F0101". "ABAN8" as "ABAN8"
"F0101". "ABALPH" as "Customer"
"F0006". "MCRP22" as "Establishment"
from "PRODDTA". "F0101" "F0101"
"PRODDTA". "F42119" "F42119"
"PRODDTA". "F4101" "F4101"
"PRODDTA". "F0006" "F0006"
where "F42119". "SDAN8" = "F0101". "ABAN8"
and "F0006". "MCMCU" = "F42119". "SDMCU"
and "F4101". "IMITM" = "F42119". "SDITM"
and "F42119". "SDDCT" in ('RI', 'RM', 'RN')
and CAST (EXTRACT (MONTH FROM TO_DATE (substr ((to_date ('01-01-'| | to_char (round (1900 + (CAST ("F42119". "SDDGL" as int) / 1000))),' DD- MM- YYYY ') + substr (to_char (CAST ("F42119". "SDDGL" as int)), 4,3) -1), 1,10))) AS INT) in : Month
and CAST (EXTRACT (YEAR FROM TO_DATE (substr ((to_date ('01-01-'| | to_char (round (1900 + (CAST ("F42119". "SDDGL" as int) / 1000))),' DD- MM- YYYY ')+ Substr (to_char (CAST ("F42119". "SDDGL" as int)), 4,3) -1), 1,10))) AS INT) in: Year
and trim ("F0006". "MCRP22") =: Establishment
and trim ("F4101". "IMSRP1") =: Division
Group By "F42119". "SDLITM"
"F42119". "SDAITM"
"F42119". "SDDSC1"
"F4101". "IMSRP1"
"F42119". "SDDOC"
"F42119". "SDDCT"
"F42119". "SDUOM"
"F42119". "SDCRCD"
"F0101". "ABAN8"
"F0101". "ABALPH"
"F4101". "IMSRP2"
"F4101". "IMSRP8"
"F4101". "IMSRP9"
"F4101". "IMSRP0"
"F42119". "SDMCU"
"F0006". "MCRP22"
I appreciate the help you can give meIt seems to me that part of fixing it could be how you join the tables.
Instead of the humongous where clause, put the applicable conditions on the join.
You have
from "PRODDTA". "F0101" "F0101"
"PRODDTA". "F42119" "F42119"
"PRODDTA". "F4101" "F4101"
"PRODDTA". "F0006" "F0006"
where "F42119". "SDAN8" = "F0101". "ABAN8"
and "F0006". "MCMCU" = "F42119". "SDMCU"
and "F4101". "IMITM" = "F42119". "SDITM"
and "F42119". "SDDCT" in ('RI', 'RM', 'RN')
and CAST (EXTRACT (MONTH FROM TO_DATE (substr ((to_date ('01-01-'| | to_char (round (1900 + (CAST ("F42119". "SDDGL" as int) / 1000))),' DD- MM- YYYY ') + substr (to_char (CAST ("F42119". "SDDGL" as int)), 4,3) -1), 1,10))) AS INT) in : Month
and CAST (EXTRACT (YEAR FROM TO_DATE (substr ((to_date ('01-01-'| | to_char (round (1900 + (CAST ("F42119". "SDDGL" as int) / 1000))),' DD- MM- YYYY ')+ Substr (to_char (CAST ("F42119". "SDDGL" as int)), 4,3) -1), 1,10))) AS INT) in: Year
and trim ("F0006". "MCRP22") =: Establishment
and trim ("F4101". "IMSRP1") =: Division
INSTEAD try something like
from JOIN "PRODDTA". "F0101" "F0101" ON "F42119". "SDAN8" = "F0101". "ABAN8"
JOIN "PRODDTA". "F42119" "F42119" ON "F0006". "MCMCU" = "F42119". "SDMCU"
JOIN "PRODDTA". "F4101" "F4101" ON join condition
JOIN "PRODDTA". "F0006" "F0006" ON join condition.
Not sure exactly how you need things joined, but above is the basic idea. Remove criteria for joining the tables from the WHERE clause and put them
in the join statements. That might clean things up and make it more efficient. -
Hi guys i am beginner , just wanted to know some info , how can i improve this query ..
select *
from tableA A, viewB B,
where A.key = B.key
and a.criteria1 = '111'
and a.criteria2 = some_funtion(a.key)
one more thing should function should be on left side of equal sign.
will a join make it better or something else is needed more than that .952936 wrote:
Hi guys i am beginner , just wanted to know some info , how can i improve this query ..
select *
from tableA A, viewB B,
where A.key = B.key
and a.criteria1 = '111'
and a.criteria2 = some_funtion(a.key)
one more thing should function should be on left side of equal sign.
will a join make it better or something else is needed more than that .If you are a beginner try to learn the ANSI Syntax. This will help you a lot to write better queries.
Your select would look like this in ANSI.
select *
from tableA A
JOIN viewB B ON A.key = B.key
WHERE a.criteria1 = '111'
and a.criteria2 = some_function(a.key);The good thing here is that this separates the typical joining part of the select from the typical filter criteria.
The other syntax very often let you forget one join. Just because there are so many tables and so many filters, that you just don't notice correctly anymore what was join and what not.
If you notice that the number of column is not what you expect, you can easiely modify the query and compare the results.
example A
Remove View B from the query (temporarily comment it out).
select *
from tableA A
--JOIN viewB B ON A.key = B.key
WHERE a.criteria1 = '111'
and a.criteria2 = some_funtion(a.key)
example B
You notice, that values from A are missing. Maybe because there is no matching key in ViewB? Then change the join to an outer join.
select *
from tableA A
LEFT OUTER JOIN viewB B ON A.key = B.key
WHERE a.criteria1 = '111'
and a.criteria2 = some_funtion(a.key)(The outer keyword is optional, left join would be enough). -
I don't know how I can optimize this SQL
Dear ALL:
I don't know how I can optimize this SQL.
Is it possible to make a better SQL or PL/SQL?
Please let me know your good thought.
Thank you.
Sincerely,
===========================================================
(SELECT A, B, C, SUM(D) as D, AVG(E) as E
FROM T1, T2
WHERE T1.timestamp BETWEEN TO_DATE('00:00:00','HH24:MI:SS')
AND TO_DATE('01:00:00','HH24:MI:SS')
GROUP BY A, B, C
UNION ALL
(SELECT A, B, C, SUM(D) as D, AVG(E) as E
FROM T1, T2
WHERE T1.timestamp BETWEEN TO_DATE('01:00:01','HH24:MI:SS')
AND TO_DATE('02:00:00','HH24:MI:SS')
GROUP BY A, B, C
UNION ALL
(SELECT A, B, C, SUM(D) as D, AVG(E) as E
FROM T1, T2
WHERE T1.timestamp BETWEEN TO_DATE('02:00:01','HH24:MI:SS')
AND TO_DATE('03:00:00','HH24:MI:SS')
GROUP BY A, B, C
UNION ALL
(SELECT A, B, C, SUM(D) as D, AVG(E) as E
FROM T1, T2
WHERE T1.timestamp BETWEEN TO_DATE('03:00:01','HH24:MI:SS')
AND TO_DATE('04:00:00','HH24:MI:SS')
GROUP BY A, B, C
ORDER BY A ASC, B ASC, C ASC
===========================================================Dear Warren:
Actually, for this query, it takes a few second to complete the query.
But, I have to create several time period and I have to optimize the SQL.
Time period is 1 hour, 30 min, 15 min, 5 min.
That is,
===========================================================
WHERE T1.timstamp BETWEEN TO_DATE('00:00:00','HH24:MI:SS')
AND TO_DATE('01:00:00','HH24:MI:SS')
UNION ALL
WHERE T1.timestamp BETWEEN TO_DATE('23:00:01','HH24:MI:SS')
AND TO_DATE('24:00:00','HH24:MI:SS')
===========================================================
WHERE T1.timstamp BETWEEN TO_DATE('00:00:00','HH24:MI:SS')
AND TO_DATE('00:30:00','HH24:MI:SS')
UNION ALL
WHERE T1.timestamp BETWEEN TO_DATE('23:30:01','HH24:MI:SS')
AND TO_DATE('24:00:00','HH24:MI:SS')
===========================================================
WHERE T1.timstamp BETWEEN TO_DATE('00:00:00','HH24:MI:SS')
AND TO_DATE('00:15:00','HH24:MI:SS')
UNION ALL
WHERE T1.timestamp BETWEEN TO_DATE('23:45:01','HH24:MI:SS')
AND TO_DATE('24:00:00','HH24:MI:SS')
===========================================================
WHERE T1.timstamp BETWEEN TO_DATE('00:00:00','HH24:MI:SS')
AND TO_DATE('00:05:00','HH24:MI:SS')
UNION ALL
WHERE T1.timestamp BETWEEN TO_DATE('23:55:01','HH24:MI:SS')
AND TO_DATE('24:00:00','HH24:MI:SS')
===========================================================
Do you know how this SQL is optimized?
Thank you, -
I have created a demo table:
create table demo1(d date);
and insert some data to table:
begin
-- add 6000000 rows
for i in 1..1000000 loop
insert into demo1 values(trunc(sysdate-i));
insert into demo1 values(trunc(sysdate-i));
insert into demo1 values(trunc(sysdate-i));
insert into demo1 values(trunc(sysdate-i));
insert into demo1 values(trunc(sysdate-i));
insert into demo1 values(trunc(sysdate-i));
end loop;
commit;
end;
The query
select * from demo1
where d=to_date('25.10.2004','DD.MM.YYYY')
executed three times faster than
select from demo1 where d=trunc(sysdate-1);
Why? How to speed up this query if I do not want to use index?
I have created index:
create index demo1_indx on demo1(d);
Execution time of queries became identical (for this volume of data).Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> create table demo1(d date);
Table created.
SQL> begin
2 for i in 1..1000000 loop
3 insert into demo1 values(trunc(sysdate-i));
4 insert into demo1 values(trunc(sysdate-i));
5 insert into demo1 values(trunc(sysdate-i));
6 insert into demo1 values(trunc(sysdate-i));
7 insert into demo1 values(trunc(sysdate-i));
8 insert into demo1 values(trunc(sysdate-i));
9 insert into demo1 values(trunc(sysdate-i));
10 insert into demo1 values(trunc(sysdate-i));
11 end loop;
12 commit;
13 end;
14 /
PL/SQL procedure successfully completed.
SQL> alter session set timed_statistics=true;
Session altered.
SQL> alter session set sql_trace=true;
Session altered.
SQL> set timing on;
SQL> set autotrace on;
SQL> select * from demo1 where d='25.10.2004';
D
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
8 rows selected.
Elapsed: 00:00:10.70
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=3285 Card=159 Byte
s=1431)
1 0 TABLE ACCESS (FULL) OF 'DEMO1' (TABLE) (Cost=3285 Card=159
Bytes=1431)
Statistics
29 recursive calls
1 db block gets
28988 consistent gets
13030 physical reads
1035300 redo size
453 bytes sent via SQL*Net to client
508 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
8 rows processed
SQL> select * from demo1 where d='25.10.2004';
D
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
8 rows selected.
Elapsed: 00:00:03.35
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=3285 Card=159 Byte
s=1431)
1 0 TABLE ACCESS (FULL) OF 'DEMO1' (TABLE) (Cost=3285 Card=159
Bytes=1431)
Statistics
0 recursive calls
0 db block gets
14441 consistent gets
12837 physical reads
0 redo size
453 bytes sent via SQL*Net to client
508 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
8 rows processed
SQL> select * from demo1 where d='25.10.2004';
D
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
8 rows selected.
Elapsed: 00:00:04.95
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=3285 Card=159 Byte
s=1431)
1 0 TABLE ACCESS (FULL) OF 'DEMO1' (TABLE) (Cost=3285 Card=159
Bytes=1431)
Statistics
0 recursive calls
0 db block gets
14441 consistent gets
12757 physical reads
0 redo size
453 bytes sent via SQL*Net to client
508 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
8 rows processed
SQL> select * from demo1 where d='25.10.2004';
D
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
8 rows selected.
Elapsed: 00:00:03.82
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=3285 Card=159 Byte
s=1431)
1 0 TABLE ACCESS (FULL) OF 'DEMO1' (TABLE) (Cost=3285 Card=159
Bytes=1431)
Statistics
0 recursive calls
0 db block gets
14441 consistent gets
12752 physical reads
0 redo size
453 bytes sent via SQL*Net to client
508 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
8 rows processed
SQL> select * from demo1 where d=trunc(sysdate-3);
D
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
8 rows selected.
Elapsed: 00:00:17.53
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=3696 Card=159 Byte
s=1431)
1 0 TABLE ACCESS (FULL) OF 'DEMO1' (TABLE) (Cost=3696 Card=159
Bytes=1431)
Statistics
6 recursive calls
0 db block gets
14503 consistent gets
12758 physical reads
0 redo size
453 bytes sent via SQL*Net to client
508 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
8 rows processed
SQL> select * from demo1 where d=trunc(sysdate-3);
D
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
8 rows selected.
Elapsed: 00:00:15.82
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=3696 Card=159 Byte
s=1431)
1 0 TABLE ACCESS (FULL) OF 'DEMO1' (TABLE) (Cost=3696 Card=159
Bytes=1431)
Statistics
0 recursive calls
0 db block gets
14441 consistent gets
12753 physical reads
0 redo size
453 bytes sent via SQL*Net to client
508 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
8 rows processed
SQL> select * from demo1 where d=trunc(sysdate-3);
D
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
8 rows selected.
Elapsed: 00:00:14.56
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=3696 Card=159 Byte
s=1431)
1 0 TABLE ACCESS (FULL) OF 'DEMO1' (TABLE) (Cost=3696 Card=159
Bytes=1431)
Statistics
0 recursive calls
0 db block gets
14441 consistent gets
12758 physical reads
0 redo size
453 bytes sent via SQL*Net to client
508 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
8 rows processed
SQL> select * from demo1 where d=trunc(sysdate-3);
D
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
25.10.04
8 rows selected.
Elapsed: 00:00:11.84
Execution Plan
0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=3696 Card=159 Byte
s=1431)
1 0 TABLE ACCESS (FULL) OF 'DEMO1' (TABLE) (Cost=3696 Card=159
Bytes=1431)
Statistics
0 recursive calls
0 db block gets
14441 consistent gets
12757 physical reads
0 redo size
453 bytes sent via SQL*Net to client
508 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
8 rows processed
SQL> alter session set sql_trace=false;
Session altered.
Elapsed: 00:00:00.00
SQL> alter session set timed_statistics=false;
Session altered.
Elapsed: 00:00:00.01
SQL> -
How does XDB optimize XML Query?
I found the query speed of XDB is much slower than Berkeley XML DB.
How does XDB optimize XML Query?
Are there any documents on this subject?
And can XDB create indices on XMLType ( e.g. the index on element/attribute value and/or structure index)? if yes, how to do that?lezhou had a valid question and asked about:
"I found the query speed of XDB is much slower than Berkeley XML DB"
"How does XDB optimize XML Query?"
These point to a "XML DB Concepts Guide", which does not yet exist.
The procedures are explained, the methods are explained. If you enable event tracing as described in the XMLDB Developers Guide 10gR2, you will see statements in your trace file which will tell you more about the XML DB architecture (and therefor you can deduct performance impact) then the manual will reveal.
An other example:
The xdbconfig.xsd file is neatly explained - in regards of http-port-etc
But not what the implecations are if you alter one of the other ones (the not explained parameters).
If you know the architecture (GROUND LEVEL), you can give an correct answer to the initial question "I found the query speed of XDB is much slower than Berkeley XML DB. How does XDB optimize XML Query?"
The balanced tree index is constructed the same way (on the same theory) in Oracle, DB2, but apparantly X is faster because in with the same buildup/architecture/databasestructure for both products, with the same data, with the same X --> value Y is beter constructed and delivers a better performance.
apples = apples
oracle xmldb = berkeley xmldb --> how can i test the o.apples=b.apples and that under these circumstances o.apples are faster ;-)
THEREFOR:
"I have to disagree a little bit...("It speaks about all these in detail").
Still waiting for the XMLDB Concepts Guide / Administrators Guide / Performance Guide. -
How I can change this query, so I can display the name and scores in one r
How I can change this query, so I can add the ID from the table SPRIDEN
as of now is giving me what I want:
1,543 A05 24 A01 24 BAC 24 BAE 24 A02 20 BAM 20in one line but I would like to add the id and name that are stored in the table SPRIDEN
SELECT sortest_pidm,
max(decode(rn,1,sortest_tesc_code)) tesc_code1,
max(decode(rn,1,score)) score1,
max(decode(rn,2,sortest_tesc_code)) tesc_code2,
max(decode(rn,2,score)) score2,
max(decode(rn,3,sortest_tesc_code)) tesc_code3,
max(decode(rn,3,score)) score3,
max(decode(rn,4,sortest_tesc_code)) tesc_code4,
max(decode(rn,4,score)) score4,
max(decode(rn,5,sortest_tesc_code)) tesc_code5,
max(decode(rn,5,score)) score5,
max(decode(rn,6,sortest_tesc_code)) tesc_code6,
max(decode(rn,6,score)) score6
FROM (select sortest_pidm,
sortest_tesc_code,
score,
row_number() over (partition by sortest_pidm order by score desc) rn
FROM (select sortest_pidm,
sortest_tesc_code,
max(sortest_test_score) score
from sortest,SPRIDEN
where
SPRIDEN_pidm =SORTEST_PIDM
AND sortest_tesc_code in ('A01','BAE','A02','BAM','A05','BAC')
and sortest_pidm is not null
GROUP BY sortest_pidm, sortest_tesc_code))
GROUP BY sortest_pidm;
Hi,
That depends on whether spriden_pidm is unique, and on what you want for results.
Whenever you have a problem, post a little sample data (CREATE TABLE and INSERT statements, relevamnt columns only) for all tables, and the results you want from that data.
If you can illustrate your problem using commonly available tables (such as those in the scott or hr schemas) then you don't have to post any sample data; just post the results you want.
Either way, explain how you get those results from that data.
Always say which version of Oracle you're using.
It looks like you're doing something similiar to the following.
Using the emp and dept tables in the scott schema, produce one row of output per department showing the highest salary in each job, for a given set of jobs:
DEPTNO DNAME LOC JOB_1 SAL_1 JOB_2 SAL_2 JOB_3 SAL_3
20 RESEARCH DALLAS ANALYST 3000 MANAGER 2975 CLERK 1100
10 ACCOUNTING NEW YORK MANAGER 2450 CLERK 1300
30 SALES CHICAGO MANAGER 2850 CLERK 950On each row, the jobs are listed in order by the highest salary.
This seems to be analagous to what you're doing. The roles played by sortest_pidm, sortest_tesc_code and sortest_test_score in your sortest table are played by deptno, job and sal in the emp table. The roles played by spriden_pidm, id and name in your spriden table are played by deptno, dname and loc in the dept table.
It sounds like you already have something like the query below, that produces the correct output, except that it does not include the dname and loc columns from the dept table.
SELECT deptno
, MAX (DECODE (rn, 1, job)) AS job_1
, MAX (DECODE (rn, 1, max_sal)) AS sal_1
, MAX (DECODE (rn, 2, job)) AS job_2
, MAX (DECODE (rn, 2, max_sal)) AS sal_2
, MAX (DECODE (rn, 3, job)) AS job_3
, MAX (DECODE (rn, 3, max_sal)) AS sal_3
FROM (
SELECT deptno
, job
, max_sal
, ROW_NUMBER () OVER ( PARTITION BY deptno
ORDER BY max_sal DESC
) AS rn
FROM (
SELECT e.deptno
, e.job
, MAX (e.sal) AS max_sal
FROM scott.emp e
, scott.dept d
WHERE e.deptno = d.deptno
AND e.job IN ('ANALYST', 'CLERK', 'MANAGER')
GROUP BY e.deptno
, e.job
GROUP BY deptno
;Since dept.deptno is unique, there will only be one dname and one loc for each deptno, so we can change the query by replacing "deptno" with "deptno, dname, loc" throughout the query (except in the join condition, of course):
SELECT deptno, dname, loc -- Changed
, MAX (DECODE (rn, 1, job)) AS job_1
, MAX (DECODE (rn, 1, max_sal)) AS sal_1
, MAX (DECODE (rn, 2, job)) AS job_2
, MAX (DECODE (rn, 2, max_sal)) AS sal_2
, MAX (DECODE (rn, 3, job)) AS job_3
, MAX (DECODE (rn, 3, max_sal)) AS sal_3
FROM (
SELECT deptno, dname, loc -- Changed
, job
, max_sal
, ROW_NUMBER () OVER ( PARTITION BY deptno -- , dname, loc -- Changed
ORDER BY max_sal DESC
) AS rn
FROM (
SELECT e.deptno, d.dname, d.loc -- Changed
, e.job
, MAX (e.sal) AS max_sal
FROM scott.emp e
, scott.dept d
WHERE e.deptno = d.deptno
AND e.job IN ('ANALYST', 'CLERK', 'MANAGER')
GROUP BY e.deptno, d.dname, d.loc -- Changed
, e.job
GROUP BY deptno, dname, loc -- Changed
;Actually, you can keep using just deptno in the analytic PARTITION BY clause. It might be a little more efficient to just use deptno, like I did above, but it won't change the results if you use all 3, if there is only 1 danme and 1 loc per deptno.
By the way, you don't need so many sub-queries. You're using the inner sub-query to compute the MAX, and the outer sub-query to compute rn. Analytic functions are computed after aggregate fucntions, so you can do both in the same sub-query like this:
SELECT deptno, dname, loc
, MAX (DECODE (rn, 1, job)) AS job_1
, MAX (DECODE (rn, 1, max_sal)) AS sal_1
, MAX (DECODE (rn, 2, job)) AS job_2
, MAX (DECODE (rn, 2, max_sal)) AS sal_2
, MAX (DECODE (rn, 3, job)) AS job_3
, MAX (DECODE (rn, 3, max_sal)) AS sal_3
FROM (
SELECT e.deptno, d.dname, d.loc
, e.job
, MAX (e.sal) AS max_sal
, ROW_NUMBER () OVER ( PARTITION BY e.deptno
ORDER BY MAX (sal) DESC
) AS rn
FROM scott.emp e
, scott.dept d
WHERE e.deptno = d.deptno
AND e.job IN ('ANALYST', 'CLERK', 'MANAGER')
GROUP BY e.deptno, d.dname, d.loc
, e.job
GROUP BY deptno, dname, loc
;This will work in Oracle 8.1 and up. In Oracle 11, however, it's better to use the SELECT ... PIVOT feature. -
I want to use one apple id in my macbook and iPad but i don't want pics to get sync and show in both devices, how should i stop this ?
Turn off My PhotoStream in iCloud on both the iPad and the Mac. PhotoStream is what shares your photos (unless you are using iCloud Photo Library Beta, in which case, all photos uploaded are accessible from all devices signed onto the same Apple/iCloud ID).
Cheers,
GB -
I accidentally dropped my friend's macbook air that was in a book bag. The keyboard is working because I can see the light but the screen is black and it won't turn off. How should I fix this? Please Help ME!!
I tried to turn it off and it didn't work... and I held on to the shift key too and it still doesn't work..
Please help me..Accidental damage is not covered under Apple warranty. And it seems there is much accidental damage. Only a Genius Bar tech looking at it can tell how much it will cost to repair.
Cost to repair will be high, I suspect (though Genius Bar will confirm/deny.
There is no gentle way to say this sir/ma'am ... someone will need to pay for your friend's MBA repairs. -
Bought a New Macbook Air and wanting to transfer only iTunes and iPhoto stuff to the new Macbook Air. How should I do this? Ive got and External HD acting as Time Machine but the Data on there is 143G worth and the New Macbook Air is a 128G HD. So i dont need all the extra Documents but want to keep them on the External HD which has been Partitioned.
Question is - How do I transfer the iTunes and iPhoto info into the New Macbook air and keep all its settings ect and also keep the Docs ect in the HD? Time Machine wont work as there is too much info for the New Macbook Air.
What should I do?In iTunes 11 uncheck the preferences setting in in the iTunes Preferences panel "Advanced > Copy Files to iTunes Media folder when adding to Library"
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I have a problem in iphone4,i am from india and bought a new unlocked iphone4 from USA last month.the problem is when i call someone their is disturbance in the voice and i cant hear the opposite person voice.please inform me how should i overcome this?
There may be a defect in the phone. As you bought it in the US the only place you can get it looked at is in the US.
When you say you bought it new, unlocked did you buy it directly from an Apple store? If you did not it was hacked to unlock it, which could also be your problem. Apple stores are the only place in the US that sells legitimately unlocked iPhones. -
How I can change this query, I got it from someone on the list, and it works just fine, Thank you! but I can not hardcode the data, the data is actually in a repiting table
SARAPPD_PIDM, SARAPPD_TERM_CODE_ENTRY, SARAPPD_APPL_NO 1 SARAPPD_SEQ_NO
We can have a person with one record another one with two or three, we just don't know, each record have a sequence number SARAPPD_SEQ_NO
this SARAPPD_PIDM = 2232040 with will a paramater pass to the function (SARAPPD_PIDM = p_pidm)
excuse my ignorance, but I just don't have experience with this kind of queries..
with t as ( -- sample data
select 2232040 SARAPPD_PIDM, 200990 SARAPPD_TERM_CODE_ENTRY, 1 SARAPPD_APPL_NO, 1 SARAPPD_SEQ_NO, to_date('12/03/2008','mm/dd/yyyy') sARAPPD_APDC_DATE, 'S*' SARAPPD_APDC_CODE from dual union all
select 2232040 ,200990 ,1 ,2 ,to_date('12/08/2008','mm/dd/yyyy'), 'D1' from dual union all
select 2232040 ,200990 ,1 ,3 ,to_date('03/18/2009','mm/dd/yyyy'), 'S*' from dual union all
select 2232040 ,200990 ,1 ,4 ,to_date('03/29/2009','mm/dd/yyyy') ,'WL' from dual union all
select 2232040 ,200990 ,1 ,4 ,to_date('03/27/2009','mm/dd/yyyy') ,'WL' from dual
) -- end sample data
SELECT * FROM (
SELECT
A.SARAPPD_PIDM,
A.SARAPPD_APDC_CODE,
A.sarappd_apdc_date,
ROW_NUMBER() OVER (PARTITION BY SARAPPD_PIDM, SARAPPD_TERM_CODE_ENTRY ORDER BY SARAPPD_APDC_DATE
DESC) row_num
,lead (SARAPPD_APDC_DATE,1) over (ORDER BY SARAPPD_APDC_DATE) AS next_date
FROM t A
where
SARAPPD_PIDM = 2232040
AND sarappd_apdc_code IN ('SA', 'FA', 'S-', 'F-', 'RF', 'F*','AD', 'W-', 'R2', 'S*', 'HF', 'WL','HD', 'R1', 'HS', 'D2', 'W+')
where next_date >= to_date('3/27/2009','mm/dd/yyyy');Edited by: user648177 on May 1, 2009 8:52 AMThank you
I am getting this result
SARAPPD_PIDM SARAPPD_APDC_CODE SARAPPD_APDC_DATE SARADAP_ADMT_CODE ROW_NUM NEXT_DATE
2232040 S* 12/03/2008 16:30:45 D1 3 03/18/2009 08:58:06
2232040 S* 03/18/2009 08:58:06 D1 2 03/21/2009 13:53:23I only want to retrieve the one with the max date ( 03/18/2009 08:58:06)
I try to add the
and SARAPPD_SEQ_NO = (select max(b.SARAPPD_SEQ_NO)
from SARAPPD b
where SARAPPD_pidm = b.SARAPPD_pidm)
{code}
{code}
but it did not work
{code}
SELECT *
FROM (SELECT A.SARAPPD_PIDM,
A.SARAPPD_APDC_CODE,
A.sarappd_apdc_date,
saradap_admt_code,
ROW_NUMBER() OVER(PARTITION BY SARAPPD_PIDM, SARAPPD_TERM_CODE_ENTRY ORDER BY SARAPPD_APDC_DATE DESC) row_num,
lead(SARAPPD_APDC_DATE, 1) over(ORDER BY SARAPPD_APDC_DATE) AS next_date
FROM saturn.sarappd A, SARADAP
where SARAPPD_PIDM = 2232040
and SARADAP_PIDM = SARAPPD_PIDM
AND saradap_term_code_entry = SARAPPD_TERM_CODE_ENTRY
AND SARADAP_APPL_NO = A.SARAPPD_APPL_NO
-- and SARAPPD_SEQ_NO = (select max(b.SARAPPD_SEQ_NO)
-- from SARAPPD b
-- where SARAPPD_pidm = b.SARAPPD_pidm)
AND sarappd_apdc_code IN
('SA', 'FA', 'S-', 'F-', 'RF', 'F*', 'AD', 'W-', 'R2', 'S*', 'HF', 'WL', 'HD', 'R1', 'HS', 'D2', 'W+'))
Where next_date <= saturn_midd.utlq.f_get_adm_freeze_date(saradap_admt_code)
{code}
i now that if I add and row_num=2 it will work, but this is just an example I don't know the row_num of all the records
Edited by: user648177 on May 4, 2009 5:57 AM
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