Subject Re: [firebird-support] How To Speed Up Update SQL
Author liviuslivius
Post date 2015-10-14T12:53:17Z
Hi,
 
you have few ways
1. EXECUTE BLOCK and there for select and delete
2. Temp Table
3. speed up subselect with expression index on Upper(Trim(MBH.HEADER_BOOK_CODE)) 
 
regards,
Karol Bieniaszewski
 
 
W dniu 2015-10-14 11:21:44 użytkownik Vishal Tiwari vishualsoft@... [firebird-support] <firebird-support@yahoogroups.com> napisał:
 
Hi All,
 
I have 480 Update SQL statements which I am executing using ADScript component in Delphi 2010.
 
Update SQL updates data in only one table called MY_BOOK, but there is a join with MY_BOOK_HEADER table. Below is the Update SQL, which is taking 81 seconds to execute all 480 Update SQL statements. Any idea how could I improve the speed of these 480 Update SQL statements ?
 
Update SQL:
 
Update MY_BOOK MB SET BOOK_NAME = 'Book Name1' , BOOK_DESCRIPTION = 'Book Desfcription1' 
Where MB.BOOK_TYPE = 4 And 
Exists (Select 1 from MY_BOOK_HEADER MBH 
            Where  
                Upper(Trim(MBH.HEADER_BOOK_CODE)) = Upper(Trim('127518010109038'))
                And MBH.FK_BOOK_GROUP =  '{79B79C33-CE56-4084-912B-6DD9F70B3DC4}'
                And MBH.PK_BOOK_HEADER = MB.SK_BOOK_HEADER
      &n bsp; );
 
 
Thanks In Advance.
 
With Best Regards.
 
Vishal