Faster way to update 250k rows with SQL

Posted by pablo on Stack Overflow See other posts from Stack Overflow or by pablo
Published on 2010-04-23T00:36:11Z Indexed on 2010/04/23 0:43 UTC
Read the original article Hit count: 250

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sql

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c#

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ADO.NET

I need to update about 250k rows on a table and each field to update will have a different value depending on the row itself (not calculated based on the row id or the key but externally).

I tried with a parametrized query but it turns out to be slow (I still can try with a table-value parameter, SqlDbType.Structured, in SQL Server 2008, but I'd like to have a general way to do it on several databases including MySql, Oracle and Firebird).

Making a huge concat of individual updates is also slow.

What about creating a temp table and running an update joining my table and the tmp one? Will it work faster?

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