FORALL context switching .. how it works ?
hi guys,
in the asktom link over here
<u>http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:17483288166654#17514276298239 </u>
it was said that
<i>
forall i in 1 .. z_tab.count
insert
does this:
a) gather up inpus to insert (the entire z_tab)
b) perform context switch from PLSQL to SQL
c) execute insert N-times
d) perform context switch back from SQL to PLSQL
</i>
my question is does FORALL statement loops ?
does it do this ?
<b>Example 1</b>
loop 1
gather data to insert
loop 2
gather data to insert
loop 3
gather data to insert
loop finish
context switch to sql engine
perform insert 1 by 1
or
<b>Example 2</b>
loop 1 or no loop at all
gather all data required for insert
loop finish
context switch to sql engine
perform insert 1 by 1
my guess is example 1 is the correct answer
Advices gurus ?
Regards,
Noob
At what level are you asking the question?
In the context of PL/SQL, there is no loop. But if you pull back the layers and look at the intermediate language the procedure is compiled into, how the PL/SQL VM happens to implement those intermediate language instructions, how Oracle's C code happens to implement the VM, etc. it wouldn't shock me if there was some sort of loop-like construct in at least some level in some version of Oracle in some situation. Particularly depending on what you want to count as a loop at that level (somewhere in the SQL engine's C code, for example, Oracle might well have a loop when you're doing a full table scan, though it's probably not particularly useful to talk about a full table scan being in a loop)
In addition, why are you asking the question? I cannot envision a functionality or performance difference between the two approaches, so it doesn't seem like something that would have any influence on how you use a particular PL/SQL construct.
Justin
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Premiere Elements 12-Instant movie option
I just recently purchased Premiere Elements 12 so I am a newbie. I like the effects in one of the instant movie options, specifically the news reel one. However, I want to put the photos that I am using in a certain order, but the instant movie rea
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I lost an important Dock system file...
You know the file "com.apple.dock.plist" ? Well, I need it to fix an error I have, but when I looked in the folder, it's not there! Does anyone know how I can get this file back? No, I don't have Time Machine set up, and no, I checked in the trash.