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126 questions, 454 terms and 400 topics in 20 areas.
20 results for “Backup Strategies”
Immutable Backup
A backup that cannot be modified or deleted for a defined retention period, even by an administrator — the control that makes backups survive ransomware and insider error.
Point-in-Time Recovery
Restoring a database to any moment within a retention window by replaying transaction logs onto a base backup, rather than only to a snapshot boundary.
Restore Drill
A scheduled, timed exercise of restoring from backup into a clean environment — the only thing that converts a backup from a hope into a control.
Backup Strategy
A plan for what is copied, how often, where to, how long it is kept, and — the part that decides whether it is real — how the restore is verified.
Join Strategies
The three ways a database combines two row sets — nested loop, hash join and merge join — and the conditions under which each is correct.
Bloom Filter Cache Guard
Placing a Bloom filter in front of an expensive lookup so that keys which certainly do not exist never reach it.
Blue-Green Database Schema
The constraint that makes fast rollback actually work — both application versions must be able to run against one schema at the same time.
Dual Write
Writing the same change to both the old and new stores during a migration, and the reconciliation that makes it trustworthy.
Managed Service
A capability the provider operates — provisioning, patching, backup, scaling and failover — leaving you the configuration and the data.
RTO and RPO
How long recovery may take (RTO) and how much data may be lost (RPO), the two numbers that determine the cost of a resilience design.
Six Rs of Migration
The standard menu of options for each application in a migration — rehost, replatform, refactor, repurchase, retire, retain.
A team says "backups run nightly and are retained for 30 days". You have one hour to assess whether they could actually recover. What do you check?
The checks, in the order that finds problems fastest 1. When was a restore last performed, and how long did it take? The single most informative question. If th
A team tells you backups run nightly and are retained for 30 days. What is missing from that answer?
What the interviewer is testing Whether you know that a backup is not a control until it has been restored — one of the most reliable ways to find an unrecovere
Maersk rebuilt roughly 4,000 servers and 45,000 PCs in about ten days after NotPetya in 2017, and recovered its directory only because one data centre had been offline during the attack. What does this say about DR design?
The case, as publicly reported In June 2017 the NotPetya malware — destructive rather than financially motivated — propagated through Maersk's network, encrypti
Backup Strategies
Scope, immutability, separation, and the restore drill that makes it real.
Caching Strategies
Cache-aside, read-through, write-through and where each belongs.
Data Migration Strategies
Backfill, dual-write, reconciliation and verification.
Release Strategies
Blue-green, canary, shadow and progressive delivery.
Testing Strategies
The pyramid, and the contract tests distributed systems add to it.
Disaster Recovery
Backup-restore, pilot light, warm standby and active-active postures.