Solved

Beginners Guide to Performance

Posted on 2003-12-04
6
1,096 Views
Last Modified: 2007-12-19
Hi there,
i'm interested in looking at the performance of my stored procedure.  Whats the best way for mesauring this, and whats the best ways to speed them up ( general tips probably will help me out).  Whats a good and bad response time for sybase by the way.

regards Peewee

0
Comment
Question by:Peewee
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
6 Comments
 
LVL 6

Expert Comment

by:ChrisKing
ID: 9880782
Analysis
1. look at the execution plan by using SET SHOWPLAN ON before execting the procedure, ensure it is using optimal indexes
2. also measure the timings of the procedure SELECT getdate() before and after the EXEC
3. don't get caught in the trap that cache has on the 2nd and subsequent executions

Fixiing
well this is a lot harder, it is usually the wrong indexes are being used by the optimiser, or the ideal indexes dont exist. You can force indexes using "index hints"
    eg.     SELECT * FROM yourtable (INDEX yourindex) WHERE ...
but many developers/managers try to avoid index hints. evaluate the entire logic of the procedure, consider removing cursors if you are not executing a child procedure within the loop, try and avoid updating your #temp tables, that is quite slow

we could go on for every on this subject, but we wont

good luck
0
 
LVL 6

Expert Comment

by:ChrisKing
ID: 9880791
> Whats a good and bad response time for sybase by the way

to do what ?
on how many rows ?
using ASA or ASE ?
what version ?
on what hardware, operating system, disk and memory config ?
etc

that is a pretty open question
0
 
LVL 6

Expert Comment

by:ChrisKing
ID: 9882224
lots of information on working with (and around :) the optimiser at
http://my.sybase.com/detail?id=2602
0
On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

 
LVL 6

Expert Comment

by:ChrisKing
ID: 9963483
Peewee
you need to provide some feedback here
0
 
LVL 5

Author Comment

by:Peewee
ID: 10542355
chaps,
apologies for the lack of repsonse here, i seemed to have forgotten about this one for some reason.


Its seems that my problem could be out of date statistics, here's my final question:

how do i check when the last time my statistics for a given table ie test_table where run?

thanks in advance peewee

 
0
 
LVL 6

Accepted Solution

by:
ChrisKing earned 50 total points
ID: 10546598
Peewee

there is no simple way that I am aware of, but you could
- compare the rowcounts from the first two commands
- look at the dates from the third command

regards
ChrisKing

~~~~~~~~~~~~~~~

exec sp_spaceused test_table
go
select o.name,i.name,s.rowcnt
from sysobjects o, sysindexes i, systabstats s
where o.type = 'U' and o.name = 'test_table'
and i.id = o.id and i.name = o.name
and s.id = i.id and s.indid = i.indid
go
select o.name,s.moddate
from sysobjects o, sysstatistics s
where o.type = 'U' and o.name = 'test_table'
and s.id = o.id

SAMPLE OUTPUT
~~~~~~~~~~~
name      rowtotal      reserved      data      index_size      unused
test_table 2685828      503846 KB      303560 KB      176914 KB      23372 KB
                              
name      name      rowcnt                  
test_table      test_table      2684273.0                  
                              
name      moddate                        
test_table      7/03/2004 3:45:43.946 AM                        
test_table      7/03/2004 3:45:43.946 AM                        
test_table      7/03/2004 3:45:43.946 AM                        
test_table      7/03/2004 3:45:06.946 AM                        
test_table      7/03/2004 3:45:06.946 AM                        
test_table      7/03/2004 3:45:06.946 AM                        
test_table      7/03/2004 3:43:15.430 AM                        
test_table      7/03/2004 3:43:15.430 AM                        
test_table      7/03/2004 3:43:15.430 AM                        
test_table      7/03/2004 3:43:04.430 AM                        
test_table      7/03/2004 3:43:04.430 AM                        
test_table      7/03/2004 3:43:04.430 AM                        
test_table      7/03/2004 3:44:19.946 AM                        
test_table      7/03/2004 3:44:19.946 AM                        
test_table      7/03/2004 3:44:19.946 AM                        
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone 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

Had a business requirement to store the mobile number in an environmental variable. This is just a quick article on how this was done.
In this series, we will discuss common questions received as a database Solutions Engineer at Percona. In this role, we speak with a wide array of MySQL and MongoDB users responsible for both extremely large and complex environments to smaller singl…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…
This video shows how to use Hyena, from SystemTools Software, to update 100 user accounts from an external text file. View in 1080p for best video quality.

734 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