Oracle-L: RE: Cursor Behavior

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Tue, 06 May 2003 04:56:39 -0800
Message-ID: <F001.00590C0F.20030506045639@fatcity.com>

Paula,

When you declare a cursor, only thing is in memory is cursor pointer and associated sql. Rows are fetched only when you issue a "fetch", and not until. If I understand what you want correctly, you need to load a pl/sq ltable in memory by looping through cursor, and then perform lookup against the pl/sql table.

By using intelligent keys and a little luck it will be way faster than performing a lookup by open-fetch-close operation. This is all assuming that the lookup must be performed outside the main cursor.

Raj

Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

-----Original Message-----
Sent: Monday, May 05, 2003 6:25 PM
To: Multiple recipients of list ORACLE-L

Guys,

Does anyone know of a good document on how cursors "behave" or "don't". My understanding was that if you declared a cursor the SQL and lookup on the table(s) would occur once and it would all be stored in memory. Then the loop and processing would occur by using the cursor in memory. However, real-time monitoring shows toggling of SQL between the "Declare Cursor Select..." part and the subsequent update processing. Yuck.

Let's see Johnathon Lewis book or Tom Kyte's or asktom or Steve F. ...hmmm.

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Author: Jamadagni, Rajendra
  INET: Rajendra.Jamadagni_at_espn.com

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Received on Tue May 06 2003 - 07:56:39 CDT