Row cannot be located for updating sql server

The shared lock on a database level is imposed to prevent dropping of the database or restoring a database backup over the database in use.For example, when a SELECT statement is issued to read some data, a shared lock (S) will be imposed on the database level, an intent shared lock (IS) will be imposed on the table and on the page level, and a shared lock (S) on the row itself In case of a DML statement (i.e.To understand better the locking in SQL Server, it is important to understand that locking is designed to ensure the integrity of the data in the database, as it forces every SQL Server transaction to pass the ACID test.

Locking is the way that SQL Server manages transaction concurrency.An exclusive lock can be imposed to a page or row only if there is no other shared or exclusive lock imposed already on the target.This practically means that only one exclusive lock can be imposed to a page or row, and once imposed no other lock can be imposed on locked resources Shared lock (S) – this lock type, when imposed, will reserve a page or row to be available only for reading, which means that any other transaction will be prevented to modify the locked record as long as the lock is active.In doing so, it will acquire an intent exclusive (IX) lock on those lower hierarchy resources that should be modified.In practice, this means that once the transaction acquires a SIX lock on the table, it will acquire intent exclusive lock (IX) on the modified pages and exclusive lock (X) on the modified rows.

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