troubleshooting

Query debugging identifies performance and correctness issues. I use EXPLAIN ANALYZE to understand execution plans. Slow query logs reveal problematic queries. pgstatstatements tracks query statistics. Understanding sequential scans vs index scans hel

Linux system administration is fundamental to DevOps. Process management with ps, top, htop monitors system activity. systemctl manages systemd services—start, stop, enable, disable. Disk management with df, du, lsblk, mount handles storage. journalct