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ThemisDB Knowledge Base

Your comprehensive resource for troubleshooting, optimizing, and operating ThemisDB in production environments.

🚨 Quick Problem Solver

What's your issue?

Problem Solution Guide Est. Time
Database won't start Troubleshooting → Startup Issues 5-15 min
Queries are slow Performance Tips → Query Optimization 15-30 min
Need to upgrade Migration Guides → Version Upgrades 30-60 min
Data corruption Backup & Recovery → Restore Procedures 20-45 min
High memory usage Troubleshooting → Memory Problems 10-20 min
Understanding logs Log Analysis → Error Interpretation 15-25 min

📚 Available Guides

TROUBLESHOOTING.md

Complete troubleshooting reference for database administrators

Learn how to diagnose and resolve common issues:

  • Connection problems and network issues
  • Performance degradation and slow queries
  • Memory leaks and resource exhaustion
  • Crash scenarios and recovery procedures
  • Data corruption detection and repair
  • Log analysis for root cause identification
  • Comprehensive diagnostic commands
  • When and how to file bug reports

Who should read this: DBAs, DevOps engineers, developers experiencing issues

Time to read: 30-45 minutes

PERFORMANCE_TIPS.md

In-depth performance optimization guide

Master ThemisDB performance tuning:

  • Query optimization techniques and best practices
  • Index selection strategies and tuning
  • Memory configuration for different workloads
  • Cache tuning for maximum hit rates
  • Batch operations for high throughput
  • Connection pooling optimization
  • Hardware recommendations and sizing
  • Monitoring and profiling tools
  • Benchmarking methodologies

Who should read this: Performance engineers, DBAs, architects

Time to read: 45-60 minutes

MIGRATION_GUIDES.md

Safe database migration and upgrade procedures

Plan and execute seamless upgrades:

  • Step-by-step upgrade procedures
  • Breaking changes checklist
  • Data migration strategies
  • Zero-downtime upgrade techniques
  • Rolling updates for clustered deployments
  • Comprehensive rollback procedures
  • Configuration migration tools
  • Testing and validation strategies

Who should read this: DBAs, release engineers, DevOps teams

Time to read: 40-50 minutes

BACKUP_RECOVERY.md

Enterprise-grade backup and disaster recovery

Protect your data and ensure business continuity:

  • Full, incremental, and differential backup strategies
  • Online vs offline backup procedures
  • Point-in-time recovery (PITR) setup
  • Disaster recovery planning and testing
  • Backup verification and validation
  • Complete restore procedures
  • Cross-region backup replication
  • Automation scripts and best practices

Who should read this: DBAs, disaster recovery planners, compliance teams

Time to read: 45-55 minutes

LOG_ANALYSIS.md

Master log analysis for debugging and monitoring

Extract insights from ThemisDB logs:

  • Log levels and configuration
  • Understanding log format and structure
  • Common log patterns and signatures
  • Error interpretation and resolution
  • Performance insights from log data
  • Centralized logging with ELK, Splunk
  • Alert configuration and automation
  • Log retention and archival policies

Who should read this: DBAs, monitoring engineers, SREs

Time to read: 35-45 minutes

🎯 Quick Start

New to ThemisDB?

  1. Start with TROUBLESHOOTING.md - Common Issues section
  2. Review PERFORMANCE_TIPS.md - Hardware Recommendations
  3. Set up basic monitoring using LOG_ANALYSIS.md

Planning a Migration?

  1. Read MIGRATION_GUIDES.md - Pre-Upgrade Checklist
  2. Test your migration strategy
  3. Set up BACKUP_RECOVERY.md procedures
  4. Plan rollback using MIGRATION_GUIDES.md - Rollback Procedures

Production System Issues?

  1. Check TROUBLESHOOTING.md for your specific symptoms
  2. Review LOG_ANALYSIS.md to analyze logs
  3. Optimize using PERFORMANCE_TIPS.md

Setting Up Backups?

  1. Start with BACKUP_RECOVERY.md - Backup Strategies
  2. Choose appropriate retention policies
  3. Test restore procedures regularly
  4. Implement automation scripts

🔍 Find What You Need

By Topic

Connection Issues:

Query Performance:

Memory Issues:

Database Crashes:

Upgrades & Migrations:

Backup & Recovery:

Monitoring & Logs:

🛠️ Common Scenarios

Scenario 1: Database Won't Start

Problem: ThemisDB fails to start after system reboot

Solution Path:

  1. Check TROUBLESHOOTING.md - Database Won't Start
  2. Review startup logs: LOG_ANALYSIS.md - Startup Sequence
  3. If corrupted, restore: BACKUP_RECOVERY.md - Restore Procedures

Scenario 2: Slow Queries

Problem: Application experiencing slow response times

Solution Path:

  1. Identify slow queries: TROUBLESHOOTING.md - Slow Query Performance
  2. Optimize queries: PERFORMANCE_TIPS.md - Query Optimization
  3. Add indexes: PERFORMANCE_TIPS.md - Index Selection
  4. Monitor improvements: LOG_ANALYSIS.md - Query Performance

Scenario 3: Upgrade to New Version

Problem: Need to upgrade from v1.3.5 to v1.4.0

Solution Path:

  1. Review upgrade guide: MIGRATION_GUIDES.md - Major Version Upgrades
  2. Backup everything: BACKUP_RECOVERY.md - Full Backup
  3. Test in staging: MIGRATION_GUIDES.md - Testing Migrations
  4. Plan rollback: MIGRATION_GUIDES.md - Rollback Procedures
  5. Execute upgrade: MIGRATION_GUIDES.md - Upgrading Between Versions

Scenario 4: Data Corruption After Crash

Problem: Database crashed and data appears corrupted

Solution Path:

  1. Assess damage: TROUBLESHOOTING.md - Data Corruption Recovery
  2. Try automatic repair: TROUBLESHOOTING.md - Recovery Procedures
  3. If needed, restore from backup: BACKUP_RECOVERY.md - Full Database Restore
  4. Use PITR if available: BACKUP_RECOVERY.md - Point-in-Time Recovery
  5. Verify recovery: MIGRATION_GUIDES.md - Verification Script

Scenario 5: High Memory Usage

Problem: Database consuming too much memory, risk of OOM

Solution Path:

  1. Diagnose: TROUBLESHOOTING.md - Memory Problems
  2. Check for leaks: TROUBLESHOOTING.md - Memory Leaks
  3. Optimize configuration: PERFORMANCE_TIPS.md - Memory Configuration
  4. Tune cache: PERFORMANCE_TIPS.md - Cache Tuning
  5. Monitor: LOG_ANALYSIS.md - Performance Warnings

Scenario 6: Setting Up Production Backups

Problem: Need to implement backup strategy for new production deployment

Solution Path:

  1. Choose strategy: BACKUP_RECOVERY.md - Backup Strategies
  2. Set up continuous backup: BACKUP_RECOVERY.md - Continuous Backup
  3. Configure retention: LOG_ANALYSIS.md - Log Retention Policies
  4. Automate backups: BACKUP_RECOVERY.md - Automation Scripts
  5. Test restore: BACKUP_RECOVERY.md - Restore Testing
  6. Set up DR: BACKUP_RECOVERY.md - Disaster Recovery Planning

📊 Cheat Sheets

Quick Diagnostic Commands

# Check database status
systemctl status themisdb
curl http://localhost:8529/_api/version

# View recent errors
journalctl -u themisdb -p err --since "1 hour ago"

# Check slow queries
curl http://localhost:8529/_api/query/slow | jq '.'

# Monitor resource usage
top -p $(pgrep themisdb-server)
iostat -x 5
netstat -an | grep 8529 | wc -l

# Verify data integrity
themisdb-admin verify-all --database production

Emergency Commands

# Stop database immediately
systemctl stop themisdb

# Clear all caches
curl -X DELETE http://localhost:8529/_api/query/cache
curl -X POST http://localhost:8529/_admin/cache/clear

# Emergency backup
themisdb-backup --backup-directory /tmp/emergency-backup --compress

# Rollback to previous version
dpkg -i themisdb-1.3.5.deb
systemctl start themisdb

Performance Quick Fixes

# Analyze slow query
db._explain(query)

# Add index
db.collection.ensureIndex({type: "persistent", fields: ["field"]})

# Clear query cache
curl -X DELETE http://localhost:8529/_api/query/cache

# Check cache hit rate
curl http://localhost:8529/_admin/statistics | jq '.server.cacheHitRate'

# Increase query timeout (in query)
OPTIONS {timeout: 60000}
FOR doc IN collection RETURN doc

🎓 Learning Path

Beginner (Week 1)

  • Read TROUBLESHOOTING.md - Common Issues
  • Set up basic monitoring
  • Create first backup
  • Practice restore procedure

Intermediate (Week 2-3)

  • Complete PERFORMANCE_TIPS.md
  • Optimize 5 slow queries
  • Configure proper indexes
  • Set up automated backups

Advanced (Week 4+)

  • Master MIGRATION_GUIDES.md
  • Implement zero-downtime upgrades
  • Configure log aggregation
  • Create disaster recovery plan

🔗 Related Resources

Official Documentation

Community Resources

Professional Support

📝 Contributing

Found an error or have a suggestion? We welcome contributions!

How to contribute:

  1. Fork the repository
  2. Create a branch: git checkout -b improve-kb-docs
  3. Make your changes
  4. Submit a pull request

Guidelines:

  • Keep examples practical and production-ready
  • Include command outputs where helpful
  • Test all commands before submitting
  • Follow existing format and style

📞 Getting Help

I can't find what I need

I found a bug

I need urgent help

📖 Document Information

Last Updated: 2024-01-24
Knowledge Base Version: 1.0
ThemisDB Version: 1.4.0
Maintainers: ThemisDB Core Team

Feedback: If you found these guides helpful or have suggestions for improvement, please let us know at docs@themisdb.org

⭐ Quick Links

Guide Key Topics Best For
TROUBLESHOOTING Diagnosis, Debugging, Recovery DBAs, DevOps
PERFORMANCE_TIPS Optimization, Tuning, Monitoring Performance Engineers
MIGRATION_GUIDES Upgrades, Migrations, Rollbacks Release Engineers
BACKUP_RECOVERY Backups, PITR, Disaster Recovery DBAs, Compliance
LOG_ANALYSIS Logging, Monitoring, Alerting SREs, Operations

Happy Database Administration! 🚀