In MVCC engines, how are readers and writers decoupled?

Problem Statement

Explanation

Multi-Version Concurrency Control keeps old versions to serve snapshots. Readers avoid waiting and do not take long read locks. Writers update a new version and mark old versions for cleanup. This design improves read concurrency but needs vacuuming or GC to reclaim old versions.

Code Solution

SolutionRead Only

-- Snapshot at statement start
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;

Practice Sets

This question appears in the following practice sets:

Transactions, Concurrency & Isolation

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In MVCC engines, how are readers and writers decoupled?

Problem Statement

Explanation

Code Solution

Practice Sets

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Master Interviews Anywhere, Anytime

In MVCC engines, how are readers and writers decoupled?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

Which clause filters rows before aggregation and affects which rows are grouped?

What is the default sort order when ORDER BY is used without ASC or DESC?

Which construct is commonly used to paginate results in SQL engines like Postgres and MySQL?

Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews
Anywhere, Anytime