How to speed up a MDX Query

Hi
I have a MDX query that takes 30 seconds and I need to speed it up. Any suggestions ? Also any settings to change on the SSAS box ?
with
set __XLSlice0 as { [Measures].[Summary Pct YearDiff QTD], [Measures].[Summary Pct YearDiff QTD Sailed] }
set __XLExistingMembers as
NonEmpty(
[DateDimCreate].[AsYearQuarter].[AsYearQuarter].allmembers,
__XLSlice0)
set __XLExistingRangeMembers as SubSet(__XLExistingMembers, 0, 1000)
set __XLNonExistingRangeMembers as
Iif(__XLExistingRangeMembers.Count = 10000,
SubSet( Except([DateDimCreate].[AsYearQuarter].[AsYearQuarter].allmembers, __XLExistingMembers),
iif (0 - __XLExistingMembers.Count < 0, 0, 0 - __XLExistingMembers.Count),
1000 )
member [Measures].__XLRelated as Intersect( [DateDimCreate].[AsYearQuarter].currentmember, __XLExistingRangeMembers ).Count
set __XLTargetSet as SubSet(Union(__XLExistingRangeMembers, __XLNonExistingRangeMembers), 0, 1000)
select { [Measures].__XLRelated } on 0,
__XLTargetSet on 1
from [Model]
cell properties value
Thanks
Javier Villegas | <a href="http://www.twitter.com/javier_vill" target="_blank" title="Twitter" rel="nofollow"> @javier_vill</a> | <a href="http://sql-javier-villegas.blogspot.com/"
rel="nofollow">http://sql-javier-villegas.blogspot.com/</a> Please click "Propose As Answer" if a post solves your problem or "Vote As Helpful" if a post has been useful to you

Hi Javier,
According to your description, you want to optimize the performance of above query. Right?
In MDX query, please avoid run-time checks in an MDX calculation that result in a slow execution path to make the MDX more efficient. If you use the Case and IF functions to perform condition checks which must be resolved many times during query resolution,
you will have a slow execution path. Rewrite these queries using the SCOPE function to quickly reduce the calculation space to which an MDX calculation refers. Please refer to links below:
Analysis Services Query Performance Top 10 Best Practices
Budget Variance - A study of MDX optimizations: evaluation modes and NON_EMPTY_BEHAVIOR
Comparing Levels in MDX and CONDITION vs. SCOPE in cell calculations
Performance of IIF function in MDX
Best Regards,
Simon Hou
TechNet Community Support

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SELECT
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So you are using JAVA, if you consult the developer's guide there is a section specifically addressing your question the ResultSet API should handle this via the formatted
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mark it as answer if it answered your question :)

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Hi rohitnegi09,
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Katherine Xiong
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How to speed up this query?

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 to show only key in mdx query

Hello Experts
i have mdx query such as :
SELECT
[Measures].MEMBERS ON AXIS(0) ,
NON EMPTY [ZCHANNEL].members
Properties [ZCHANNEL].[2ZCHANNEL]
ON AXIS(1)
FROM ZIC_TPL/ZIC_TPL_DETAIL
SAP VARIABLES
[ZVSOCALM] INCLUDING [0CALMONTH].[200605]
the result from this query are zchannel text and zchannel key
how to show only zchannel key ?
really appreciate your help.
regards
JeiMing
Message was edited by: JeiMing Tjiam

Hi Juice
Yes, i have already tried setting zchannel as key only in my query
but the result from mdx query still shown key and text
Regards
JeiMing

How to Find MDX Query

Hi,
I have created a WEBI report on an OLAP universe on top of a BEx query. Is it possible to see the MDX query being generated by my WEBI report? If yes, then could someone please guide me as to how do I see the exact MDX query generated by the report? Thanks!
Regards,
- Noman Jaffery

Hi Ingo,
Thanks for the answer. We are having an issue and I was wondering if you could shed somelight on this.
Our WEBI report running on top of an OLAP Universe on BEx query is taking forever to run and in the end does not return any data.
We are monitoring the query through BW and apparently it is stuck in the step: CL_RSR_MDX_BXML_FLATTENING.
Through logging we got the underlying MDX query and ran it in BEx Editor and it ran in seconds. But when the same MDX query in ran in BEx Editor using the XML option, it is stucking on the same step i.e. CL_RSR_MDX_BXML_FLATTENING
My hunch is that the result is being converted into XML format from MDX native format before it is passed on to InfoView and this conversion/flattening is taking forever. Is it a known issue? Is there any way around? Thanks!
- Noman Jaffery

How to speed up a MDX Query

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