在測試中發現 SqlBulkCopy 在數據量大的時候會出現超時報錯。

Timeout expired with SqlBulkCopy

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There are two ways to fix this error:

1) Increase Timeout by default it is 30 second

sqlBulkCopy.BulkCopyTimeout = {time in seconds}

2) Decrease BatchSize by default it try to insert all rows in one batch

sqlBulkCopy.BatchSize ?= {no of rows you want to insert at once}

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlbulkcopy.bulkcopytimeout.aspx

說得很清楚。BulkCopyTimeout 的缺省值為 30 秒，這樣處理數據量大了容易發生超時。碰巧 BatchSize 的缺省值為 0，意思是會把所有操作塞到一輪中處理，這樣更加劇了一輪處理所耗費的時間長度。解決辦法就是修改上述兩個量中的一個即可。比如 batch 尺寸變小了，每輪的時間也就縮短了。

那么每輪處理多少量合適呢？這涉及到性能問題：

What is the recommended batch size for SqlBulkCopy?

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Given this scenario, I found a batch size of 5,000 to be the best compromise of speed and memory consumption. I started with 500 and experimented with larger. I found 5000 to be 2.5x faster, on average, than 500. Inserting the 6 million rows takes about 30 seconds with a batch size of 5,000 and about 80 seconds with batch size of 500.

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I found that 500 was the optimal value for my application. The 500 value for SqlBulkCopy.BatchSize is also recommended here.

總結

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