db2-rhelUse when installing, configuring, or managing IBM DB2 LUW on RHEL 9 (and AlmaLinux/Rocky 9) — instance creation, database administration, buffer pool and tablespace management, backup/restore with HADR, performance tuning (db2advis, db2pd, MON functions), runstats/reorg, SELinux contexts, firewalld rules, and DB2 pureScale. Part of the db2-* skill family.
Independent GitHub snapshot · Automated classification · Original documentation governs
Companion skill to rhel-server-admin and rhel-databases. For Python DB2 connectivity see python-enterprise-connectors.
Detailed code examples, patterns, and configuration are in the reference files below. Read the relevant file when working on that area.
| File | Covers |
|---|---|
| install-admin.md | DB2 installation on RHEL, instance management, and database administration (tablespaces, buffer pools, schemas, tables) |
| performance-monitoring-rhel.md | performance tuning (db2advis, db2pd, MON functions), monitoring, maintenance, RHEL-specific configuration, and DB2 pureScale |
| security-backup-recovery.md | DB2 security (authentication, authorization, roles, audit), backup strategies, and HADR recovery |
| Anti-Pattern | Why It Fails | Correct Approach |
|---|---|---|
| Running DB2 with default buffer pool sizes | Default 1000 pages is far too small for production; excessive disk I/O, poor query performance | Size buffer pools based on workload: OLTP needs 60-80% of data in memory; run db2pd -bufferpools to monitor hit ratio |
| Skipping RUNSTATS after bulk data loads | Optimizer uses stale cardinality estimates; queries that were fast become full table scans | Run RUNSTATS WITH DISTRIBUTION on tables and indexes after every significant data change |
| Using HADR without automatic client reroute | Failover happens but applications cannot find the new primary; manual intervention required | Configure ALTERNATE SERVER in database directory and enable ACR in application connection strings |
| Not setting LOGFILSIZ and LOGPRIMARY appropriately | Default log sizes cause log-full conditions during batch loads; transactions roll back and retry endlessly | Size transaction logs based on largest expected transaction; monitor with db2pd -logs; set LOGSECOND as overflow |
| Running backup without testing restore | Backup jobs succeed but restore fails due to missing log files, wrong paths, or version mismatch | Test restore to a different instance quarterly; validate with RESTORE DB ... WITHOUT ROLLING FORWARD |
| Workload | Skill |
|---|---|
| Core RHEL admin (dnf, SELinux, firewalld, LVM) | rhel-server-admin |
| PostgreSQL, MySQL, Redis on RHEL | rhel-databases |
| Python DB2/Oracle/SQL Server connectors | python-enterprise-connectors |
| Web servers (Nginx, Apache, Caddy) | rhel-web-servers |
| Docker / Podman containers | rhel-docker-host |
| Monitoring (Prometheus, Grafana, PCP) | rhel-monitoring |