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PORecords disappearing in PDO mssql transaction loop
 

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  1. PORecords disappearing in PDO mssql transaction loop
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    <p>I have the following code (more or less) to import anywhere from 500.000 to 4.000.000 rows:</p> <pre><code>$sSql = "Insert into table (a,b,c) VALUES(?,?,?)" $oSQLStmnt = $pdo-&gt;prepare($sSql); $oSQLStmnt-&gt;setAttribute(PDO::SQLSRV_ATTR_ENCODING, PDO::SQLSRV_ENCODING_SYSTEM); if (!$oSQLStmnt) { echo $pdo-&gt;errorInfo(); // Handle errors } $pdo-&gt;beginTransaction(); $iLineCounter = 1; while (($sLine = fgets ($oCSV, 8000)) !== FALSE) { $aLine = explode('|', $sLine); //Fgetscsv did not work properly if ($iLineCounter % 100 == 0) { lo("Inserting row " . $iLineCounter); $pdo-&gt;commit(); sleep(0.15); $pdo-&gt;beginTransaction(); } try { $oSQLStmnt-&gt;execute($aLine); $iSuccesulInserts++; } catch (exception $e) { print_r($e); $iFailedInserts++; } $iLineCounter++; } $pdo-&gt;commit(); </code></pre> <p>As you can see, I perform a commit every 100 lines, and I even added some sleep. I used to run the commit only once every 25.000 lines, and I did not use any sleep. However, at one point, I discovered I was missing records. I started playing with these settings (sleep and number of rows). This way I reduced the number of missing records from 50.000 to about a 100. But I'm still missing records! Where are they going? I know the SQL is ok, because I immediately receive errors when somethings wrong there. </p> <p>I thought I could stack a lot of inserts during a transaction? Could calling beginTransaction be a problem?</p> <p><strong>UPDATE:</strong></p> <p>The bounty ended and I had to award it. Thank you all for your answers. Or tips actually, as none of you actually answered my question. I was not asking for a workaround, although you suggestions are much appreciated. The answer the bounty was awarded to received it because it came closest to actually answering my question. Unfortunately it did not work.</p> <p>For now I'm using CSV bulk import, that works fine, but if anyone has any other tips for fixing this issue, please let me know. As I prefer using my original method.</p>
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    1. CORunning the code without beginTransaction and stacking all insert queries in one transaction results in the disappearance of about 40.000 records...
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    2. COIf I repeat this loop without transactions, it works just fine. No records lost...
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    3. COThe problem is not caused by PDO. That's for sure.
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