Answer
Shared (S): For reading.
Exclusive (X): For writing.
Update (U): Prevents deadlocks during read-to-write transitions.
Intent Locks: Used to manage lock hierarchy efficiently.
Quick Answer
Shared (S): read lock, multiple transactions can hold simultaneously. Update (U): intent to update — prevents two transactions from upgrading to exclusive at the same time. Exclusive (X): write lock, blocks all other access. Intent locks (IS, IX, SIX): signal at a higher level (table) that lower-level locks exist.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ