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Is there way to take exclusive lock Stack Overflow?
Of course there is a nasty workaround to really, really lock the table: alter its schema. This will take a Sch-M lock which conflicts with basically any access to the table. It even holds of some metadata read operations. It could look like this: I tested this to work. Is SQL Server right not obeying the XLOCK? Or is this a flaw in the product?
Where does the locking hierarchy start in SQL Server?
SQL Server has introduced the locking hierarchy that is applied when reading or changing of data is performed. The lock hierarchy starts with the database at the highest hierarchy level and down via table and page to the row at the lowest level.
What are the different types of locking in SQL Server?
At the table level, there are five different types of locks: 1 Exclusive (X) 2 Shared (S) 3 Intent exclusive (IX) 4 Intent shared (IS) 5 Shared with intent exclusive (SIX) More
What does it mean to have shared lock in SQL Server?
Intent shared (IS) – when an intent shared lock (IS) is acquired it indicates to SQL Server that the transaction has the intention to read some lower hierarchy resources by acquiring shared locks (S) individually on those resources lower in the hierarchy
What does row exclusive lock mean in DML?
A row exclusive lock (RX), also called a subexclusive table lock (SX), indicates that the transaction holding the lock has updated table rows or issued SELECT FOR UPDATE. An SX lock allows other transactions to query, insert, update, delete, or lock rows concurrently in the same table.
Which is the most restrictive lock in Oracle?
FOR UPDATE) but not to update the table. An exclusive table lock (X) is the most restrictive mode of table lock, allowing the transaction that holds the lock exclusive write access to the table. Only one transaction can obtain an X lock for a table. You should probably read the oracle concepts manual regarding locking.
How does a share table lock work in DML?
An SX lock allows other transactions to query, insert, update, delete, or lock rows concurrently in the same table. Therefore, SX locks allow multiple transactions to obtain simultaneous SX and SS locks for the same table. A share table lock (S) held by one transaction allows other transactions to query the table (without using SELECT