Benefits of the Collection on the slider
Hi allCursor behaves like a pointer to the result of the query.
Collections stores the result of the query.
But,
What are the benefits of the collection on the slider?
I Googled it but did not find the exact info.
THX
Nina wrote:
Hello
Each has its own use. They are not compete but complement them.
It must be used, mix and match, together.If the collections were all this unnecessary while they would not have existed, and neither would BULK COLLECT.
In COLLECTIONs, you have some IMBRIQUEES TABLES, ASSOCIATIVE and VARRAY. The VARRAY is probably still there for backward compatibility, but the other 2 are extremely useful.
Points to consider:
(a) collect bulk is much faster than the CURSOR loop
(b) Once charged collection can be manipulated in memory. Faster but heavy on the PGA.
Faster than what exactly? Certainly not faster than doing it right in SQL. Faster than line by line cursor loop treatment? Depends on what 'manipulation' is necessary.
(c) NESTED tables allow you to organize data, can be used with the cursor.
(d) the string to table and table yo string (like java String.split method) possible only with the Collection. Not possible without collect / array
Also possible with pure SQL.
I can't imagine a world without COLLECTIONs. I use them extensively, everything as I use the SLIDERS.
I had a few uses for them... but only a few. Most of the work is done on the database using SQL.
Not convinced yet? Details of OWA_UTIL, APEX_APPLICATION_GLOBAL, DBMS_SQL, etc.. They have associative arrays in all directions.
In fact the Apex Application would not come to existence with associated tables; they are used left, right and Center inAll the negative opinions expressed on the Collections only reflects ignorance.
'How to make friends and influence people' by Dominique
Tags: Database
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