Solved

Query slow over Dblink.

Posted on 2013-11-19
2
461 Views
Last Modified: 2013-11-20
Hi all,

When I am trying to execute the below query, it is very slow(1 to 2 mins), but that not happens everytime, like once in 5 or 6 times.

SELECT SUM(NVL(TOT_NO_PKGS,0))
        FROM MQ_DPC_PKGS MDP,
             MQ_DPC_BOES MDB
       WHERE MDP.DOC_NO    = MDB.DOC_NO
         AND MDP.BILL_NO   = MDB.BILL_NO
         AND MDB.BILL_NO = '303-00006116-13'
         AND REC_TYPE      = 'I'
   AND NVL (MDP.DEL_IND, 'N') = 'N'

table MQ_DPC_PKGS is from remote DB. Help me to find out reason / solution.
query-cost.jpg
0
Comment
Question by:sakthikumar
2 Comments
 
LVL 77

Assisted Solution

by:slightwv (䄆 Netminder)
slightwv (䄆 Netminder) earned 250 total points
ID: 39659245
Check the query/plan from the remote database.

Also try monitoring network usage when it is slow.
0
 
LVL 13

Accepted Solution

by:
magarity earned 250 total points
ID: 39661339
Your query specifies one particular BILL_NO on the local table but not on the remote table. The optimizer may be translating that to a table scan on the remote.  I suggest either:
1) switch the BILL_NO to the remote table: MDP.BILL_NO = '303-00006116-13' (instead of MDB.BILL_NO =)
OR
2) move the query processing to the remote server with the 'driving_site' hint, see the Oracle documentation here: http://docs.oracle.com/cd/B10501_01/server.920/a96533/hintsref.htm#5699
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
SQL Developer 6 75
How to Gracefuly recover in Racle stored procedure 1 47
Trying to get a Linked Server to Oracle DB working 21 79
error in my cursor 5 50
How to Create User-Defined Aggregates in Oracle Before we begin creating these things, what are user-defined aggregates?  They are a feature introduced in Oracle 9i that allows a developer to create his or her own functions like "SUM", "AVG", and…
Configuring and using Oracle Database Gateway for ODBC Introduction First, a brief summary of what a Database Gateway is.  A Gateway is a set of driver agents and configurations that allow an Oracle database to communicate with other platforms…
This video shows setup options and the basic steps and syntax for duplicating (cloning) a database from one instance to another. Examples are given for duplicating to the same machine and to different machines
Via a live example, show how to restore a database from backup after a simulated disk failure using RMAN.

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question