Why is it "horrible"? What's wrong with this quote from oracle docs? Igor Neyman, OCP DBA ineyman@xxxxxxxxxxxxxx -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of ryan.gaffuri@xxxxxxx Sent: Monday, March 22, 2004 5:42 PM To: oracle-l@xxxxxxxxxxxxx Subject: Re: Partitioning Question (1 of several) was that right out of the oracle docs? That is horrible. My understanding is that partitioning pruning = partition elimination. Say have a table with 3 partitions. Based on your where clause Oracle will know in advance which partition(s) are needed for the sql statement and their by 'pruning' or eliminating the other partitions from being scanned. > > From: david wendelken <davewendelken@xxxxxxxxxxxxx> > Date: 2004/03/22 Mon PM 01:35:43 EST > To: oracle-l@xxxxxxxxxxxxx > Subject: Partitioning Question (1 of several) > > > "Partition pruning dramatically reduces the amount of data retrieved from disk and shortens the use of processing time, improving query performance and resource utilization. If you partition the index and table on different columns (with a global, partitioned index), partition pruning also eliminates index partitions even when the partitions of the underlying table cannot be eliminated." > > I not positive I understand the second sentence. Could someone give an example? > > > ---------------------------------------------------------------- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > ---------------------------------------------------------------- > To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx > put 'unsubscribe' in the subject line. > -- > Archives are at //www.freelists.org/archives/oracle-l/ > FAQ is at //www.freelists.org/help/fom-serve/cache/1.html > ----------------------------------------------------------------- > ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------