Apex slow report but not in dev?

Hello world

as the title says I have a problem with the speed of my reports (I.R.).
The scenario is this: I report with a filter at the front which is not rendered until at least one of 6 possible values is defined. The statement underlying the report is large enough (about 8 tables with millions of rows, but each of them is indexed nicely) so a filter is necessary. The preparation of the declaration, that everything worked perfectly, since each of the given values is a single point of entry in the data model and access roads resulting for the optimizer were always "unique index scan" or "range of index scans.
Now the problem is that I don't have many of the 6 values the user will now use. That's why I had to make every filter criteria in the statement as follows:

WHERE (customer_id =: P1_CUSTOMER_ID or: P1_CUSTOMER_ID IS NULL)
AND (= client_name: P1_CUSTOMER_NAME or: P1_CUSTOMER_NAME IS NULL)
and so on...

My problem is that when the value is giving the execution plan result is obviously horrible. But given that the report is not rendered unless there is at least a set of values, this isn't the problem right?

Unfortunately, Apex doesn't seem to work that way, as it always uses the execution plan that has no values listed. As revealed a SQL Trace.
Unfortunately, I can work only with limited hints (first_rows and others), since forcing him an index does not work.

Any of you guys have an idea, how can I solve this problem?

Published by: docdir on January 29, 2010 06:15

Docdir wrote:
Hey everybody,

Thanks for your interest. As I already mentioned the query itself is not the issue because it works very well in sqlplus and produces a brilliant execution plan when a value is provided. Here it is:
...
and (buis_type.id =: P10_BUISNESS_TYPE or: P10_BUISNESS_TYPE is NULL)
and (buis.id =: P10_BUISNESS_ID or: P10_BUISNESS_ID is NULL)
and (as buis_lo.title: P10_TITLE or: P10_TITLE is NULL)
and (as buis_lo.versiontitle: P10_VERSION_TITLE or: P10_VERSION_TITLE is NULL)
and (as buis_lo.displaytitle: P10_DISPLAY_title or: P10_DISPLAY_title is NULL)
and (buis_lo.locale_id =: P10_LOCALE_ID or: P10_LOCALE_ID is NULL)
and (CUSTOMER.id =: P10_CUSTOMER_ID or: P10_CUSTOMER_ID is NULL)
and (customer.name to the client as: P10_CUSTOMER_NAME or: P10_CUSTOMER_NAME is NULL)
and (lic. CONTENTCATEGORY_ID =: P10_CONTENTCATEGORY_ID OR: P10_CONTENTCATEGORY_ID is NULL)

I seriously doubt that you will get the execution plan in SQL Plus. If you add values then this is a diferent request. You must use liaison even variables in sqlplus to compare the execution plan. How have you seen the execution plan in sql * more?

The problem is not to do much with APEX. For the first part, it's just a pure sql problem.
However. You could create DIFFERENT reports with different behind sql queries or regions. According to the chosen input values, you can decide what region/query will be executed.

Example not tested

/* region one:  INPUT = customername */
...
and (buis_type.id =  :P10_BUISNESS_TYPE OR :P10_BUISNESS_TYPE is NULL)
and (buis.id = :P10_BUISNESS_ID OR  :P10_BUISNESS_ID is NULL)
and (buis_lo.title like :P10_TITLE OR :P10_TITLE is NULL)
and (buis_lo.versiontitle like :P10_VERSION_TITLE OR :P10_VERSION_TITLE is NULL)
and (buis_lo.displaytitle like :P10_DISPLAY_title OR :P10_DISPLAY_title is NULL)
and (buis_lo.locale_id = :P10_LOCALE_ID OR :P10_LOCALE_ID is NULL)
and (CUSTOMER.id = :P10_CUSTOMER_ID OR :P10_CUSTOMER_ID is NULL)
and CUSTOMER.name like :P10_CUSTOMER_NAME
and (lic.CONTENTCATEGORY_ID = :P10_CONTENTCATEGORY_ID OR :P10_CONTENTCATEGORY_ID is NULL) 

/* region two: INPUT = Business ID choosen */
...
and (buis_type.id =  :P10_BUISNESS_TYPE OR :P10_BUISNESS_TYPE is NULL)
and buis.id = :P10_BUISNESS_ID
and (buis_lo.title like :P10_TITLE OR :P10_TITLE is NULL)
and (buis_lo.versiontitle like :P10_VERSION_TITLE OR :P10_VERSION_TITLE is NULL)
and (buis_lo.displaytitle like :P10_DISPLAY_title OR :P10_DISPLAY_title is NULL)
and (buis_lo.locale_id = :P10_LOCALE_ID OR :P10_LOCALE_ID is NULL)
and (CUSTOMER.id = :P10_CUSTOMER_ID OR :P10_CUSTOMER_ID is NULL)
and (CUSTOMER.name like :P10_CUSTOMER_NAME OR :P10_CUSTOMER_NAME is NULL)
and (lic.CONTENTCATEGORY_ID = :P10_CONTENTCATEGORY_ID OR :P10_CONTENTCATEGORY_ID is NULL)

You can also use different hint in the select statement to force the optimizer to choose a special map, you prefer. But that shouldn't be necessary.

This is only of a poor workaround, but it might be useful.

BTW: decode is able to compare NULL values. But point you might not equal to NULL.

Published by: Sven w. February 1, 2010 16:44

Tags: Database

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1717220 wrote:

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ORA-20987: APEX - interactive report region does not exist in the application

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create or replace function get_report_query(nPage_id IN number)
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I tried to follow Denes Kubicek his blog (Denes Kubicek ApEx BLOG: interactive report query is).

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