Opinion about performance

A my prospect needs to insert items in the orders of 100000 or more on a SQL Server.
Has someone experienced so (or more) massive items data?
Are there, or could be, performance problems during the use?
Thanks for your attention.
Nicola

Hi Martella,
We have a client with over 180,000 items and no performance problems at all.
Regards
Ad

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What is your opinion about IDEs?

I've heard different opinions about using IDEs like Jbuilder, Symantec VisualCafe, Microsoft J++...
Some people think that to program in java using a simple text editor is a prehistoric and a very hard way and they prefer using IDEs.
Other people think that IDEs are not good tools to program in java because they add a lot of unnecessary code and because you have more control for the code if you program all by yourself. These persons maybe think that the only utility of IDEs is their help.
I would like to know all your opinion about this.
Thanks!

Hi,
I think it depends on the context if one may use an IDE or not.
There are 3 things to be considered:
1) processor speed
2) application type
3) lazyness
ad 1:
If you want to use an IDE, you must have a powerful processor.
In fact, all major JAVA IDEs are written entirely in JAVA.
So a Pentium 3 or K7 and faster processors are advisable.
ad 2:
When you write servlets or small text based applications with only a few classes, an notepad like nedit for UNIX systems is in fact the best solution.
A huge JAVA program with many screens (SWING or AWT) for instance cannot be easily developed with a small editor. Here an IDE should be considered as a must.
(Unless you are really a hardcore Java specialist)
The same approach can be applied to bean development.
ad 3:
IDE come with many pre-constructed classes and concepts. Developing a client/server or multi-tier application can be an easy task if you spent some money on an IDE.
Other advantages of IDE are built-in tutorials and programming enhancements (when you type the name of an object the IDE shows you immediately all its methods for example). So if you are a beginner or one of those people that thinks that a programm cannot be done without development platforms like Microsoft Visual XXX, JAVA IDEs are a logical conclusion.

A simple question about performance!

Hi! I have a simple question about performance. Suppouse that you have a servlet or a class with DB access, and you need to use a value several times in that page. What is best, to assign the value from say, a resultset or a request.getParameter() to a variable or to call the resultset or the request every time you need to retrieve that value? Which option uses less memory, which is faster, etc.?
Hoping the best fou u
Raul

If you need more values from a db, the best is to open some connections (connection pool) and use the for accessing the db.
To get the data only once, open the connection, get the data, store the data whereever you want: variable (class), hidden control (if you want to send from one page to another by request) and close the connection as quicky as possible.
The advantage of the first method is that the most time consuming activity (connections opening) is done only once.

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I heard that this book is really good for beginers " How to program in java 5th edition by Deitel" can you please give my your opinion about this book ,.
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Looking for book about performance tuning 11g database

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I am looking for books about performance tuning oracle 11g. The documents from OTN 2 days 11g performance tuning and performance tuning guide are not really study material.
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greeting,
Max

Hi,
http://astore.amazon.com/oraclebooks-20/detail/1590599683 {Part IV Database Tuning }
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Sim

Doubts about performance:

Doubts about performance:
Hi:
In my work we have performance problems with the database (Oracle 9i v. 2), we have said that the TOAD consumes a lot of resources.
I know how to affect the performance of the database using a tool such as the toad.. ?
It is true that the use of inner join and left join instead of = and (+) is better?
Thanks

This is too broad a question.
Toad can fire random sql.
sql*plus can fire random sql.
Why would Toad be the problem?
You would need to gather statspack data to demonstrate this.
Sybrand,
Agreed on it and its a relevant point.But I guess he is not worried about the db performance.Anyways lets see what OP says.
Inner join and left join will always use CBO (Cost Based Optimizer) instead of RBO.
I am not sure that I have read that anywhere. They came into Oracle in 9i where optimizer mode was choose as the default one. Just by the syntax, oracle would push them to use CBO as the default one,I am not sure about this. Even if we are having + symbol and have the stats,Oracle wold go for CBO right?Can you please point me to some where in the docs where it is mentioned that using this keywords,Oracle would use only CBO?
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How did you learn about performance issues?

I've been thinking about trying to get a LV certification, so I tried out the online test, and I've got a few questions about learning LV on a deeper level.
One question asked whether it is more efficient to cast each piece of an array as its being built in a for loop, or to cast the entire array at once, after the array has been created.
Another question asked, if array indexing is enabled on the output of a while loop then is the array resized on every iteration?
I can make guesses at how LV works, but I really don't know what goes on under the hood. How do you pros know what's really going on with your code?
Also for anyone out there who has been certified, can you pass the test with just experience, or do you have to undergo some NI training to learn some things? Has LV certification been beneficial to you?
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Hi John,
I have mentored 2 1/2 CLA's (the 1/2 is the "Architect Supreme" and she really only needed encouragement).
Here are my suggestions.
1) Study for the test you plan to take. Studying above the test level you are after can only confuse things.
2) If you can get the funding, take the NI courses suggested for that test. Some of the Q's come from the text.
3) Monitor this Exchange for questions regarding performance and speed.
4) Use the search box at the top of this page and search for "Greg McKaskle". Some of the best performance info available is in his writtings.
5) Use the "info-LabVIEW" serach engine that can be found at
http://www.searchview.net/
and search fro Greg McKaskle and Rolf Kalbermatter. Again great information.
6) Make a habit of using the "Task manager>>> Performance screen while you are devloping and testing. It is a good way to find out what things are good and which are bad. You find out subtle things like straight line interpolation on a chart is faster than step interpolation.
7) Read all of the LV release notes. The questions you posted are answered in those docs and changed in LV 6.0.
8) Review the LabVIEW ZONE challenges. They are competitions based on performance. Read the reviews.
9) Read the white papers. Do not miss 144!
10) Start posting Q's on this Exchange. Let us expert (myself excluded) that prowl this list help out.
Done for now,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
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How to go about performance issues

Hi Experts,
Need help on how to get started on below situations.
Users are complaining about queries running slow even after rebuilding indexes,updated stats,no blocking?
How to go about troubleshooting such issues?
Thank you.

http://technet.microsoft.com/en-us/library/ms177500(v=sql.105).aspx
http://redmondmag.com/articles/2013/12/11/slow-running-sql-queries.aspx
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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About Performance Tuning in java

What good ways to improve performance of code that uses lot of strings?

Use appropriate data structures and algorithms.
[url http://java.sun.com/developer/technicalArticles/Interviews/devinsight_1/]Write dumb code.
Don't worry about microoptimizations, and don't look for "clever tricks."
Don't assume something will be "slow" and then write fugly code to "fix" it. Write clean, simple code using standard idioms, test it, and if it doesn't meet your performance requirements, profile it to find where the bottleneck is, and once you find and fix that, test and profile again to see if the fix actually made a significant improvement. If it didn't, and the new code is not at least as clean as the old, then revert it back to the previous code.
All of the above advice applies for all Java coding, not just String-heavy cases.
The only semi-major String-specific performance/memory techniques that come up are as follows. And they don't really matter all that often in the real world:
1. When building up a String in a loop, if the pieces are large or if there are many pieces, use StringBuilder or StringBuffer's append() method, not direct String concatenation with plus-equal.
// do this
String s;
StringBuilder sb = new StringBuilder();
while (...) {
sb.append(something);
s = sb.toString();
// not this
String s = "";
while (...) {
s += something;
// or
s = s + something;The reason for this is that with the second approach, every time through the loop we create a new String object and copy all the characters over from the previous one. The first approach just keeps adding characters to the end of the existing StringBuilder.
However, this really only makes a practical difference if the pieces are very large, or if there are a lot of them.
Also note that String s = "a" + b + "c" + d; is fine, because the compiler turns those into append() calls anyway.
2. Use new String() when taking a small substring of a large String, if the small one will be kept around much longer than the larger original.
// do this
String s1 = a_very_large_string;
String s2 = new String(s1.substring(5, 7));
// not this
String s1 = a_very_large_string;
String s2 = s1.substring(5, 7);The reason for this is that substring uses the same backing array as the original. If we're done using the large String, that String object itself may become eligible for GC, but the large backing array will be kept around as long as the smaller String is alive. In this case, we're wasting most of its space for just a few characters. However, when we do new String(), that creates a new String object with its own backing array of just the characters that are part of that String, so once the original goes away, its large backing array can go with it.
If the strings are of about the same scale, or if they're both small or even only "sort of large," this will not be an issue. Also, if both of the Strings' lifetimes end at about the same time, it won't be an issue.
Again, though, don't overdo it. Pay close attention to the cases I described where these techniques don't matter.
Edited by: jverd on Oct 6, 2010 10:08 PM
Edited by: jverd on Oct 6, 2010 10:10 PM
Edited by: jverd on Oct 6, 2010 10:21 PM

A question about Performance Settings

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LOB question about performance, fragmentation etc.

Well..
I want to discuss the issues around LOB objects.
If I have an enttity class with n-count fields and then a lob as the n+1th field, does this affect performance in any way ? E.g. if performance is random access for an object without a lob, does the performance get linear or something when the lob is introduced?
Another one:
If the latter is true: is it an option for me to use an @OneToOne mapping to compensate ?
What about fragmentation ? How can a database or whoever compensate for fragmentation, in the case the lob is the n+1th field ? Or just in general: How the fragmentation issues are handled?
(Im just thinking that lobs introduce fragmentation and brings performance down...)

This will be san=me if you are considering the Local interfaces.
For remote interface(like accessing EJB from Servlets resides in diffferent Apps Server) use the DTO(data Transfer Object) patterns.
Regards
Sushil

Opinion about performance

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