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I’ve thoroughly read MSDN about table hints and I don’t seem to find the locking granularity default. Suppose I have the following query:
SELECT TOP (1) * FROM MyTable WITH (UPDLOCK, READPAST) ORDER BY SomeColumn ASC;
You see, I specified UPDLOCK and READPAST hints, but not any of granularity hints such as TABLOCK or ROWLOCK.
Which granularity lock level is used by default?
There is no ‘default’. The granularity (row, page, (partition | object)) is computed dynamically based on allowed options for the object (allow_page_locks/allow_row_locks), information about the operation intent (probe, scan, insert), the estimated size of the rowset and a number of other factors (isolation level, is filegroup read only etc). In most cases you will get row-level granularity for singleton operations and page-level granularity for scans. The query you posted is probably going to go with page-level granularity because is a scan.