5. Populating Tables : COPY Statement Operation : Locking During a Copy
 
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Locking During a Copy
When you use the COPY statement, the locking system takes one of the following actions:
A Shared lock on the table while data is being copied into a file
An Exclusive lock on the table during bulk copies to the table, for maximum speed
An Intent Exclusive lock on the table during an incremental copy to the table. Because inserts are used to update the table, the copy can encounter lock contention.
For a complete explanation of locking, see the chapter “Understanding the Locking System.”