INFO: Difference Between BeginTrans/CommitTrans and Optimistic B

• Microsoft Visual Basic Professional and Enterprise Editions for Windows, versions 5.0, 6.0

SUMMARY

Some confusion may exist between the Optimistic Batch Update and the BeginTrans/CommitTrans methods of updating databases. This article explains the differences between the two methods.

MORE INFORMATION

Batch updates are used when you open a connection using the Optimistic (Client) Batch cursor library. Each time the Update or UpdateRow method is used, the rdoResultSet is cached locally but the main database remains unchanged. The BatchUpdate method must be used to update the main database.

The BeginTrans/CommitTrans methods will cache the information on the database server each time it's changed. When the CommitTrans method is used, the information is permanently updated. If the RollBackTrans method is used, the new data is discarded.

For optimization purposes, it is best to use the Batch update method when large amounts of data are going to be changed all at once. This will send one large burst of data across the network when the BatchUpdate method is called as opposed to sending many small updates. For the same reason, it's best to use BeginTrans/CommitTrans when updating smaller bits of data.

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