Level Extreme platform
Subscription
Corporate profile
Products & Services
Support
Legal
Français
Very slow SQL Update even when index exists
Message
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Environment versions
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP SP2
Network:
Windows 2000 Server
Database:
Visual FoxPro
Miscellaneous
Thread ID:
01174680
Message ID:
01174682
Views:
10
>I am having a problem with the SQL Update below. From the amount of time it takes to run with only 1 or 2 records in the cursor c_chng I believe it is ignoring the index on k_ivinvt and scanning all 186K recs in the inventory table IVINVT. The last time I had this problem was on updating invoice lines and I fixed it by adding a 2nd line to the where clause to include the invoice key. This time there is no other index I can use. The two tables are tied only by the ivinvt.k_ivinvt = c_chng.k_ivinvt. This has got to be a really common event so I know I am missing something here.
>
>I added set enginebehavior 90 but it made no difference
>
>
set enginebehavior 90
>
>* Update inventory allocated amounts
>TEXT TO mSqlCommand noshow pretext 15
>  update ivinvt
>  set allocated = allocated + c_chng.chng
>  from c_chng
>  where ivinvt.k_ivinvt = c_chng.k_ivinvt
>ENDTEXT
>&mSqlCommand
If the field Allocated is string you must ALLTRIM or RTRIM() it.
About slow, what is the result of:
set enginebehavior 90

* Update inventory allocated amounts
SYS(3054,12,[TestMe])
TEXT TO mSqlCommand noshow pretext 15
  update ivinvt
  set allocated = allocated + c_chng.chng
  from c_chng
  where ivinvt.k_ivinvt = c_chng.k_ivinvt
ENDTEXT
&mSqlCommand
MessageBox(TestMe)
SYS(3054,0)
Against Stupidity the Gods themselves Contend in Vain - Johann Christoph Friedrich von Schiller
The only thing normal about database guys is their tables.
Previous
Next
Reply
Map
View

Click here to load this message in the networking platform