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Guru's Guide to SQL Server Architecture and Internals, The by Ken Henderson

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Concurrent Snapshot Processing

By default, SQL Server places shared locks on the table articles in a transactional publication while the initial snapshot is being created. This ensures transactional consistency for the snapshot but prevents updates from being made to the tables while the snapshot is being generated.

Transactional replication offers an option to work around this limitation known as concurrent snapshot processing. Note that the option is available only when a publication is limited to SQL Server 7.0 and later subscribers. When concurrent snapshot processing is enabled for a transactional publication, the Snapshot Agent will place a shared lock on the table articles in the publication as it always does. It will then add an entry ...

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