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How to tweak c3po & mysql tandem for performance?


How to tweak c3po & mysql tandem for performance?

By : user2954350
Date : November 22 2020, 01:01 AM
help you fix your problem Make sure you define a preferredTestQuery, for instance SELECT 1.
From http://www.mchange.com/projects/c3p0/#preferredTestQuery
code :
preferredTestQuery
Default: null
        Defines the query that will be executed for all connection tests, 
        if the default ConnectionTester (or some other implementation of 
        QueryConnectionTester, or better yet FullQueryConnectionTester) is being used. 
        Defining a preferredTestQuery that will execute quickly in your database may 
        dramatically speed up Connection tests. (If no preferredTestQuery is set, the
        default ConnectionTester executes a getTables() call on the Connection's 
        DatabaseMetaData. Depending on your database, this may execute more slowly 
        than a "normal" database query.)
 ....


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tweak the performance of this nested for loop

tweak the performance of this nested for loop


By : Tom
Date : March 29 2020, 07:55 AM
This might help you Something you could try is setting up the all_coods variable to be indexed by the id, rather than just being an array. This way you will save time with the inner loop.
For example:
code :
$list = tons of stuff

//now, loop through the stuff once to generate 
//the assoc array that's indexed by IDs
$listMap = array();
foreach($list as $item) {
    $listMap[$item['id']] = $item;
}

//the main looping
foreach(loop an array) {
    if(isset($listMap[$id])) {
        //you just saved looping through the other array.
    }
}
c3po configuration and mysql aborted connections

c3po configuration and mysql aborted connections


By : Min Young Seo
Date : March 29 2020, 07:55 AM
around this issue Connections eventually go stale. Please configure some Connection testing. The simplest thing to do would be to just modify your config so that
code :
hibernate.c3p0.testConnectionOnCheckout=true
How to make tweak the performance without using the subquery

How to make tweak the performance without using the subquery


By : Keith McGill
Date : March 29 2020, 07:55 AM
hope this fix your issue A Tabel contains invoice data, I need to sum up the qty and amount based on the year as well as mothwise without using subquery , Try This Solution
code :
DECLARE @Table1 TABLE
    ([Month] int, [Desc] varchar(2), [Amt] int, [QTy] int)
;

INSERT INTO @Table1
    ([Month], [Desc], [Amt], [QTy])
VALUES
    (1, 'FF', 25.00, 1),
    (1, 'ss', 55.00, 2),
    (2, 'ss', 78.00, 3),
    (2, 'FF', 99.00, 1),
    (3, 'ss', 54.00, 1),
    (4, 'FF', 58.00, 5),
    (5, 'FF', 55.00, 2),
    (5, 'ss', 55.00, 2),
    (1, 'ss', 77.00, 1)
;

SELECT DISTINCT
    [Month],
    YearAmt = SUM([Amt]) OVER(PARTITION BY 1),
    Amt = SUM([Amt]) OVER(PARTITION BY [MOnth]),
    Qty = SUM(CASE [Desc] WHEN 'SS' THEN [QTy] ELSE 0 END) OVER(PARTITION BY [MOnth]),
    YearQty = SUM(CASE [Desc] WHEN 'SS' THEN [QTy] ELSE 0 END) OVER(PARTITION BY 1)
    FROM @Table1
How to prevent application (using hibernate + c3po) from hanging if Mysql port is blocked?

How to prevent application (using hibernate + c3po) from hanging if Mysql port is blocked?


By : Gama Riastomo Putro
Date : March 29 2020, 07:55 AM
hope this fix your issue You probably need to set network timeouts for MySQL, by default there are none. Use connectTimeout for the initial connection and socketTimeout for subsequent network operations. For example:
code :
jdbc:mysql://dbhost:3306/dbname?connectTimeout=1000&socketTimeout=200000
UIImageView and UIImage: How can I tweak the most performance out of them?

UIImageView and UIImage: How can I tweak the most performance out of them?


By : user323087
Date : March 29 2020, 07:55 AM
around this issue Only a benchmark can tell you for sure. I'm inclined to think that UIImage image caching is probably extremely efficient, given that it's used virtually everywhere in the OS. That said with the number of images you're displaying, your approach might help.
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