What is the difference between pls_integer index and index of directory for a collection?

Hi all

I have a bit of difficulty understanding the difference between pls_integer and directory when you declare a collection...

Is not so much pls_integer than the supposed to be the same in 10g and 11g?

My problem is that I've declared a collection in a procedure with directory and by record type, it takes 10 seconds to process. (IE TYPE test_table IS the TABLE OF test % rowtype directory INDEX ;))

However, the same procedure with the declared collection with index of pls_integer, take only 1 second to process. (IE TYPE test_table IS the TABLE OF test % rowtype INDEX BY PLS_INTEGER ;))

Any help would be welcome.

Thank you.

MichaelR wrote:

I don't understand when say you not to use DML in a LOOP and use sql only. Can you please give me an example?

I usually of code like this:

I'm looped slider
Update table_name
the value of col1 = i.rec1
where col2 = i.rec2;
end loop;

This approach is incorrect.

All SQL is parsed and executed as SQL cursors. There is no such thing as use SQL or cursor.

A cursor is a "compiled SQL program. Source SQL that has been analyzed in a cursor executable code. When you retrieve the cursor, you push the button the cursor or program execution. It finds a row and return lines. He's on a break. You get the rows returned, these processes and then click the button run the cursor using fetch. Until the cursor/program finds no additional data (or he faces a snapshot too old for example, where it can not rebuild a coherent reading to find the next set of lines).

A cursor is and has never been a set of cached data in memory that you are recovering from.

Take a look at your code. You use a slider/program to retrieve data from the database. For each row in the cursor returned, you call another slider/program and pass this line as input data.

It's slow. Data line moves a cursor to your PL/SQL code, and then again from your PL/SQL code to another cursor.

A single slider that makes the reading (the SELECTION cursor) part and the part of writing (the slider to UPDATE), requires no PL/SQL to read and write the parts together.

How to write this unique SQL cursor? You can use:

UPDATE (SELECT... Of... JOIN THE... WHERE...) SET...

You can use the MERGE statement. Or maybe just a statement UPDATE simple vanilla.

What is the problem of a conceptual, performance and scalability point of view, is the approach that you have indicated above. That approach will ALWAYS be slower than just SQL. This approach cannot scale.

The mantra of performance for Oracle is simple: Maximise SQL . Minimize the PL/SQL.

Use the SQL language correctly and properly. Do not what SQL is designed to do, in PL/SQL.

Tags: Database

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