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Database Administrator skills: what to learn first, and what can wait

New DBAs tend to learn installation wizards first, and that's the part of the job that matters least. Hiring managers want proof you can bring a database back from a bad night and explain why a query got slow. Pay can change quickly, but skills take longer to build, so learn them in this order.

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Step one

Gets you the interview

A restore you've actually runTake full, differential and log backups of a practice database, delete a table on purpose, then restore to the minute before you did it. Write down every command. When a recruiter asks about backups, that write-up is your answer.

SQL beyond SELECTWindow functions, CTEs, transactions and isolation levels are the floor. You should be able to explain why a long open transaction blocks everyone else and how to find it with sp_WhoIsActive or pg_stat_activity.

One engine, learned properlyPick SQL Server, PostgreSQL, Oracle or MySQL from the postings near you and learn its guts: how it stores pages, writes its log and handles locks. Screeners filter on the engine name, so depth on one beats a line listing four.

Linux or Windows Server basicsDatabases live on an operating system, and plenty of slowdowns start there. Know how to check disk space, memory pressure and I/O waits with tools like iostat, top or Performance Monitor before you blame the query.

Step two

Gets you the offer

Finding the real cause of a slowdownPanels love a live tuning exercise. Show you check wait stats first, then find the worst queries in Query Store or pg_stat_statements, then read the plan. Jumping straight to adding an index is the answer they're waiting for you to avoid.

Index maintenance and statisticsKnow when a rebuild helps, when updating statistics is all you needed, and why a missing-index hint from the engine isn't a command. Ola Hallengren's maintenance scripts are a common reference in SQL Server shops, so learn what they do.

Permissions set up by roleGrant access through roles, never to named people, and be ready to explain least privilege, service accounts and auditing who read a sensitive table. Teams handling health or payment data will ask about this directly.

Scripting the weekly choresPowerShell with the dbatools module, or Bash and Python for PostgreSQL, lets you check backups across every server in one go. Bring a small script to the interview. It shows you won't spend Monday mornings clicking through consoles.

Step three

Gets you promoted

High availability you've failed over for realAlways On availability groups, Patroni for PostgreSQL or Oracle Data Guard all look fine on a diagram. Seniors are the ones who've forced a failover in a test window, found what broke and fixed the runbook.

Managed cloud databases and their billAmazon RDS, Aurora and Azure SQL move the hard parts around rather than removing them. Knowing how instance sizing, storage and read replicas drive cost is what gets you in the room when a migration gets planned.

Schema changes through codeTools like Flyway, Liquibase or SSDT put schema changes in source control and push them through a pipeline. Owning that process turns you from the person who approves risky changes into the person who makes them safe by default.

Capacity planningTracking growth in data size, connections and log volume lets you ask for hardware or budget before a disk fills at night. Managers notice the DBA whose forecasts turn out right.

Certificates worth your time

Certificate	Best for	Effort	Worth it?
Microsoft Certified: Azure Database Administrator Associate	SQL Server DBAs whose company is moving to Azure	a month or so of evening study	The most useful one for Microsoft shops. It covers Azure SQL, security and automation, and recruiters recognise the name.
Oracle Certified Professional, Oracle Database Administrator	DBAs aiming at finance, government or large enterprise Oracle estates	a few months of steady study, often after the associate level	Respected where Oracle runs the business, and sometimes listed as required. Skip it if every posting near you says PostgreSQL or SQL Server.
AWS Certified Solutions Architect, Associate	DBAs working with Amazon RDS or Aurora	a few weekends to a month	Not a database certificate, but it proves you understand networking, storage and backups in AWS, which is where cloud DBA interviews go.

Exam content and names change often, so check the current details on Microsoft Learn, Oracle University or AWS Training before you book an exam.

Put it on your résumé like this

Weak

Responsible for maintaining and tuning company databases.

Strong

Ran 40 SQL Server instances, cut the nightly batch from 5 hours to 90 minutes by rewriting 6 blocking queries, and tested restores monthly with a recovery point of 15 minutes.

Questions people ask

Should a DBA learn NoSQL databases like MongoDB?

Learn the basics once you're solid on a relational engine. Plenty of teams run MongoDB, Redis or Cassandra next to their main database, and knowing how their backups and replication differ makes you useful on more tickets.

What's the fastest way to practise without a DBA job?

Build a home lab with Docker. Run PostgreSQL and SQL Server Developer Edition, load a sample database like Stack Overflow's public dump, then break things on purpose: fill the log, kill a replica, corrupt a page. Fixing your own mess teaches more than a course.

Which skill do junior DBAs underrate most?

Writing a clear incident note. After an outage, someone has to explain what failed, what you did and what changes. The DBA who writes that well gets trusted with bigger systems.

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