Re: Urgent help needed, gurus

Hi,

I hope my response isn't too late...

It may well be because when you do "select function(x) from table" the query can return after processing the first few rows only (ie: FIRST_ROWS) type execution. As soon as you ask for a count of those rows though it must process every row (ie: ALL_ROWS). If the table is very large then this is most likely your problem - although it's not a "problem" its just the way things go.

Of course if you are running "select function(x) from table" through a product like SQL*Plus that will print all the rows to the screen and this is still much quicker then you might have a problem worth looking into. To be honest I'm not sure if sort area size has a big impact on a simply "select count(*)" but it might since a type of sort is used to count the rows. I also have a feeling that using a function on a table normally prevents parallel querying so perhaps there are some opportunities there - but I cannot offer any specific advice.

Regards,

     Mark.

                                                                                                                   
                    "mac"                                                                                          
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                    Sent by:             Subject:     Urgent help needed, gurus                                    
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                    24/12/2002                                                                                     
                    20:03                                                                                          
                    Please respond                                                                                 
                    to ORACLE-L                                                                                    
                                                                                                                   
                                                                                                                   

Oracle 817 on W2k:

SELECT FUNCTION(X) FROM TABLE works fine.

SELECT COUNT (*) FROM
 (SELECT FUNCTION(X) FROM TABLE) where the function and the table are the same as above, takes hours and hours, without any result, and I have to stop
it. There is NO ERROR MESSAGE.
The same story (no result, no error message) it's happening when: INSERT INTO TABLE1 SELECT FUNCTION(X) FROM TABLE I need some help.

Merry Christmas,

Ciprian MAFTEI
Systems Analyst
Telequote Network
Romania

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