Shared Locks

Shared locks are a type of permission used in databases to control access to data. When a process acquires a shared lock on an item, it can read the data but not modify it. Multiple processes can hold shared locks simultaneously, allowing them to read the same data concurrently without interfering with each other. However, if a process wants to change (write) the data, it must wait until all shared locks are released and then obtain an exclusive lock. Shared locks help maintain data consistency and prevent conflicts during concurrent access.