473,795 Members | 2,840 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

runstats on global temp tables

is it necessary to do runstats on global temp tables if you create
indexes on them and then want to use global temp tables with indexes
efficiently ?

Dec 1 '06 #1
2 3336
It depends. (What a great answer.)

The optimizer will examine potential access paths and pick one to use.
Statistics give the optimizer better information about the table
contents which will influence the decisions the optimizer makes. If the
default assumptions the optimizer makes when statistics are not
available are sufficient to cause selection of "good" access paths, then
running statistics will not improve anything.

Your best bet is to explain your queries that use the temporary table
and examine the access plans. Run statistics on the table then rerun the
explains and look for any differences.

Phil Sherman
db2admin wrote:
is it necessary to do runstats on global temp tables if you create
indexes on them and then want to use global temp tables with indexes
efficiently ?
Dec 3 '06 #2
I would say yes. What I do is add COLLECT DETAILED STATISTICS at the
end of the DGTT index CREATE statement (note that COLLECT SAMPLED
DETAILED STATISTICS might also suffice).

--Jeff

db2admin wrote:
is it necessary to do runstats on global temp tables if you create
indexes on them and then want to use global temp tables with indexes
efficiently ?
Dec 4 '06 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

4
13743
by: Corrine | last post by:
Hi, I am creating a global temporary table that is session-specific. I insert a BLOB into this table, and then select the BLOB from this table into a ResultSet. The ResultSet sees this BLOB object, and I am able to get the binary input stream from this blob. However, when I invoke InputStream.read(byte) on this input stream, I get the following exception: java.io.IOException: ORA-01410: invalid ROWID
6
3761
by: pb648174 | last post by:
I have a pivot table implementation, part of which is posted below. It returns no errors in query analyzer, but when profiler is run, it shows that "Error 208" is happening. I looked that up in BOL and it means that an object doesn't exist. This block of code below works fine on my local development machine, but not on our shared development server until I go into the tempdb and make the user have the role db_owner. Even wierder is that...
3
2176
by: Jan Arickx | last post by:
My situation is as follows. I have several big SQL queries in a data warehouse using 1 big fact tables and 10 dimension tables. The queries join all of them together but the optimizer doesn't care which dimension table it joins first (we ran runstats on all of them but the dimensions look a lot alike... about same order of rows, ...). I know it should first join on 1 specific dimension if it's in the query since that dimension will discard...
1
7659
by: raqfg | last post by:
Hi. I am trying to test out the automatic maintanance with notification feature of DB2 v8.2. I have enabled the auto maint with notification. The problem I am facing is that I only get email notifications from DB2 when there is an alarm as follows: ADM10500E Health indicator "Monitor Heap Utilization" ("db2.mon_heap_util") breached the "upper" alarm threshold of "95 %" with value "124 %" on "instance" "DB2"....
33
3291
by: DFS | last post by:
An application I wrote has been deployed on Citrix, and the Citrix admin tells me all users run the same .mde file. There aren't a lot of concurrent users, but even 2 could be cause for concern. I think the use of globals is worrisome in this case. Anybody have any experience with Access on Citrix? (Al Kallal already griped me out about globals, but if he has anything new to add I'm all ears).
16
10331
by: pukivruki | last post by:
hi, I wish to create a temporary table who's name is dynamic based on the argument. ALTER PROCEDURE . @PID1 VARCHAR(50), @PID2 VARCHAR(50), @TICKET VARCHAR(20)
1
4642
by: crazy_jutt | last post by:
hi, anyone knows if i can create index on global temp tables if yes, will i use session schema for indexes also ? if yes, can i create all kinds like unique, clustered, mdc etc indexes in global temp table ? please direct me to some web resource where i can find what all i can do and i cannot do with global temp tables
5
8842
by: Rahul B | last post by:
Hi, I have very little knowledge about creating Procedures/functions in DB2. When i tried to create the test function like CREATE FUNCTION GET_TEST (P_TEST_ID INTEGER, P_SEL_OR_SORT INTEGER,
4
6021
by: db2udb | last post by:
Hi, I have just taken over as the DBA for a database that has not had any reorgs/runstats run against it for the last three years. As a first step, I have just run reorg/runstats against the system catalog tables & rebound packages. I next intend to reorg/runstats all the application tables that I have identified as needing this and due to the remote possibility of this causing an adverse affect on performance, it has been decided that I...
0
9673
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
9522
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
10217
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
10167
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
9046
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
0
6784
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
0
5440
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
1
4114
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
3730
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.