Why should you care?

Production outages and slow systems are diagnosed with basic linux commands knowledge — not guesswork.

See it live — copy this example

Run these statements in SQL Developer or SQL*Plus against your lab PDB. Prefer a practice user — not SYS — for application SQL.

-- Basic Linux Commands — DBA style check (privileges required)
SELECT name, open_mode FROM v$database;
SELECT instance_name, status FROM v$instance;

-- Common dictionary peek
SELECT table_name FROM user_tables ORDER BY table_name FETCH FIRST 10 ROWS ONLY;

What happened?

• v$database / v$instance confirm the DB is open.
• user_tables lists objects you own — a gentle way to explore without changing anything.

Practice next

1. Connect to your lab as a user with the needed privileges.
2. Run the read-only checks first.
3. Write the definition of this topic in your own words.
4. Change one literal in the example and re-run.
5. Write a second example from memory without looking.

Remember

You can explain Basic Linux Commands in plain English. You ran at least one related command or query. You know one real system where it matters.

Basic Linux Commands on a banking PDB

On-call DBA reviews basic linux commands during a health check before peak traffic.

Outcome: You know which view/command to open first.