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POPreparedStatement - executeBatch
 

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  1. POPreparedStatement - executeBatch
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    <p>I am using executeBatch for writing into database. <strong>Batch size is 50.</strong></p> <pre><code>long startt = System.currentTimeMillis(); da.writeAll(batchRaiseRecords); LoggerClient.writeError("DML write sendDML - " + (System.currentTimeMillis() - startt) + " - size - " + batchRaiseRecords.size(),""); </code></pre> <p>Now, this time taken by this operation varies from <em>0.2 to 6 seconds</em>. My doubt is why is this much variation?</p> <pre><code>Line 2246: DML write sendDML - 362555602 - size - 50, Line 3960: DML write sendDML - 609145666 - size - 50, Line 6034: DML write sendDML - 1398866678 - size - 50, Line 7676: DML write sendDML - 324071619 - size - 50, Line 9398: DML write sendDML - 492674501 - size - 50, Line 11180: DML write sendDML - 632663209 - size - 50, Line 14926: DML write sendDML - 6776384464 - size - 50, Line 16542: DML write sendDML - 384737523 - size - 50, Line 17896: DML write sendDML - 287436213 - size - 50, Line 18730: DML write sendDML - 206414079 - size - 50, Line 19548: DML write sendDML - 288492245 - size - 50, Line 20382: DML write sendDML - 310753856 - size - 50, Line 21212: DML write sendDML - 695180583 - size - 50, Line 22466: DML write sendDML - 232818139 - size - 50, Line 23360: DML write sendDML - 246089140 - size - 50, Line 24420: DML write sendDML - 192751420 - size - 50, </code></pre> <p>I tried this operation many a times, and results are almost similar.</p> <p>Why this much variation in same operation <strong>executeBatch()</strong>?</p> <p><strong>EDIT :</strong> DML is used for writing to MySql database. And there is only one client.</p>
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    1. PTQuestion
    1. USCharles
    1. USBatty
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    1. COWhich JDBC driver and database are you using? How many concurrent clients are there? Also, this might be a candidate for [dba.stackexchange.com](http://dba.stackexchange.com).
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      1. USjmiserez
    2. COWhat is `da.writeAll()` ? The delay may come from `LoggerClient.writeError()`. Hard to say, not enough information.
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      1. POPreparedStatement - executeBatch
      1. USPeterMmm
    3. COedited question. And Logger.writeError is not causing problem.
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      1. USBatty
 

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