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It is complete, your masterpiece report. Not only does it meet your customer's expectations, it blows them out the water, all they want is beautifully summarised and displayed in a myriad of ways.

Then....

Disaster!

You try to run the report for a month against the live database and not the two days test data you used for development.

Suddenly your report's runtime goes from twenty seconds to two hours.

Every Crystal Reports developer has experienced this situation and it can be one of the most frustrating aspects of report design.

Thankfully there are a variety of things that can be done to combat bad performance, any one of which can reap huge benefits.

Here are the five most likely causes of poor performance and how to mitigate their effects.

1. The Database Set Up.

This may or may not be within your direct control to alter, but databases are not set up ideally.

Two top contenders are:

a. The fields you are filtering on are not indexed. You can check whether or not this is the case by referring to the Linking Tab in the Database Expert window. Indexed fields have colored markers next to them.

I have personally seen reports run hundreds of times quicker due to the addition of an index being added to an important (to the report filter) field.

b. Using a view rather than a table to report from can be devastating to a report's performance. This is mainly due to views not having indexes. A view is a collection of tables (much like a basic report) and is often used to simplify data for end users.

The only way to avoid this is to report on the tables which make up the view. Identifying whether the source of a field is a table or a view can be done via the Database Expert as tables and views are listed separately.

Identifying which tables make up a view can be much trickier and you may need the help of the database documentation.

Also, when using Oracle databases, turning off the case sensitive option on queries can really speed up reporting times but may require existing reports to be rewritten.

2. Using the wrong ODBC driver.

ODBC drivers are how Crystal Reports attaches to the database. There is usually a variety of ODBC drivers which will work for any particular make of database and some are better than others.

The only way to really test this is to run the report with all the suitable ODBC drivers and see which is the most efficient.

Experience has taught me that the ODBC driver provided with the software associated to the database is usually the best option.

3. Excessive Use of Sub Reports

Each sub report is like another report accessing the database, and if that sub report is placed in the Detail Section it will run for EVERY record the main report loads. Even if placed in a Group Section the sub report will still be run numerous times.

Report Sections are usually the ideal place to home a sub report as they will only run once. But this still turns one report into two as far as performance is concerned.

The best way to negate the performance issue caused by sub reports is to not use them.

Ninety nine percent of sub reports are not necessary and the same result can be achieved using other methods through grouping, running totals and / or formulas.

4. Table Linking

Anything other than a Link Type of equals ('=') will cause a massive degradation in performance.

The Link Options window (accessible through right clicking on a specific link) will allow any values to be reset.

If there is a need for this time of link, the same result can be achieved through the Group Selection or through formatting (and hiding the unwanted records) once they are loaded into the report.

5. Record Selection

When code for the record selection is written correctly, Crystal Reports will pass all the logic to the database as SQL and only return the data needed.

If the record selection is not written in an SQL friendly way, Crystal Reports will bring back all the data and then filter it locally. This can be drastically slower than when calculated on the database.

Using the Record Selector Expert will guarantee that any filter created will be evaluated on the database and be as efficient as possible.

An additional point which can make a difference in some cases is when the report is scheduled to run. Heavy network traffic or database usage can impact a report's running time.

Working through the above points will enhance the efficiency of your slowly running reports. Building your reports with all this in mind from the beginning will save you redevelopment time later.

Jase Dove is a top Business Intelligence consultant and author who has shared his expertise with some of the most respected businesses in the world.

Crystal Reports is his reporting software of choice and the subject of his book "Crystal Reports Formulas Explained" which is the most advanced book on the market. Currently available with a free 70 page Crystal Reports XI tutorial:

http://www.scry-business-intelligence.com/products/bookoffer.php

Awesome Tips For Enthusiastic Table Tennis Players

Table tennis is surely one of the most popular world class games. The main features involved in this game are instantaneous reaction to strike the ball. Next is of course the perfect and accurate placement of the ball such that the opponent finds difficult to hit it back. The view of this wonderful game has created an impression that it will be easy and simple to learn as well as play. It just for a reason that the table is too small and the paddles seems to be light weighted. This kind of impression will end up contradictory of once you face the game. The players who face this game for the first time, it will be surely a difficult task to deal with. The Table-Tennis game at first was just played for a light entertainment without taking it as serious as a competition. It was originated with a name called ping pong. Europe is the place where these games were played for the first time for a great entertainment.

Though you are a true ping pong fan and have noticed its every single tip still you will face the difficulty to play it. It was in the year 1988; this sport was also included as an Olympic sport due to its increasing popularity. The main reason for its increasing popularity is that the mental sharpness that you require to play this game. Ping Pong instructional DVD is more than enough for you to learn all the latest developed strategies and tips. All kinds of information regarding table tennis are already updated in various websites of internet. It hosts numerous table tennis instructional videos to learn all kinds of loops and smashes. The table tennis DVDs are also a good option to go with if you are really interested in learning this fantastic game. The DVD table tennis is a single DVD which involves all the master skills of great table tennis experts.

The game table tennis has surely made a huge progress in the sports field. The main reason for this mind success is many people who worked for it thinking that it s their only career. In this matter, we can find many big celebrities including Jan Ove Waldner. He is a single Swedish man who was truly successful in lifting this game towards the world levels. The Jan Ove Waldner DVD is a single which will let you know how important and great his contribution for table tennis is. A single of this table tennis DVD will make you much familiar with this wonderful game. There are also many books which are available in all local markets for teaching you the guidelines and strategies regarding this game. They are the most preferred option since they within the budget as well as more effective. All that you have to do for becoming master table tennis is to buy this fantastic table tennis DVDs which forms you a homely coach. Remember it not only teaches the game but also improves the capability fast mental decision making and mind body coordination

About the Author

Table Tennis Master provides several training methods, articles, tips and news about Table Tennis. To master the skills of table tennis logon to http://www.tabletennismaster.com

How to seperate table´s field value(Varchar, Num) in MySql?

i have a table´s field called client_id(varchar) actually, there are some result having num value(i.e 0012) which is a foreign key to crm_employee_bs(i.e. id) table and some result having char value(i.e joey) which is also a foreign key to crm_employee_bs(i.e. username) table.

I'm not sure from the question what you actually want to do -- if you are trying to match them up, you could an "or", like
select * from whatevertable a, crm_employee_bs b where a.client_id=b.id or a.client_id=b.username

If you want to restructure the table so that client_id was always the id (probably a good idea -- but make sure it works with the rest of your app) you could do something like
update whatevertable a,crm_employee_bs b set a.client_id=b.id
where a.client_id=b.username

Not sure if that helps you, but if you could be more specific about what you actually want to do with the table, it might be easier to give you a better answer.

Diamond memorializes teen
No one knows what Nate Savieo would have loved most about Saturday's dedication of a baseball field in his name at Meadowbrook Park. But those closest to the New Haven High School junior, who died Jan. 5 of a strep infection, have some ideas.

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