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Databases

Replication lag

The delay before a write on the primary becomes visible on a replica.

Why interviewers ask about it

The concrete bug is read-after-write: a user saves and the change appears to vanish. The fix is routing that read to the primary or pinning the session.

Read-write splitting

Sending writes to a primary and reads to replicas.

Sharding

Splitting data horizontally across databases by a shard key.

This term is part of the free Python Full-Stack interview preparation module - browse the full glossary for every definition.

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Why interviewers ask about it

Related terms

Read-write splitting

Sharding

Why interviewers ask about it

Related terms

Read-write splitting

Sharding