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Re: Batch INSERT performance

by samtregar (Abbot)
on May 05, 2009 at 20:10 UTC ( [id://762051]=note: print w/replies, xml ) Need Help??


in reply to Batch INSERT performance

What database are you using? This is faster with MySQL, often by a significant margin. Even faster is LOAD DATA, but that requires some moderately annoying data formatting and error handling is harder (error ignoring is easy though!).

-sam

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Re^2: Batch INSERT performance
by Herkum (Parson) on May 05, 2009 at 20:18 UTC

    The database is Mysql.

    The LOAD DATA seems to use files, and I have no intention of writing files to do the data import. I do admit I did not know about the LOAD DATA option though, I might use it for something else.

    However, would placeholders be problematic for a large data import?

[reply]
      Herkum:

      You might not want to be so quick to dismiss the idea. I'm not knowledgeable about Mysql, but for MS SQL, Sybase and Oracle, the fastest way you can load data into a table is to bulk load it in from a flat file. And we're not talking about a five percent increase in speed--it's normally an order of magnitude faster.

      ...roboticus
[reply]
      Placeholders should work fine. I've used placeholders for statements with tens of thousands of parameters.

      -sam

[reply]

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