postgresql-operations
Manage PostgreSQL: schema migrations, performance tuning, backups, monitoring per README-SCHEMA-MAINTENANCE.md
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- Hack23/cia
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- 2026年2月1日 00:05
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- Manage PostgreSQL: schema migrations, performance tuning, backups, monitoring per README-SCHEMA-MAINTENANCE.md
# PostgreSQL Operations Skill
## Purpose
Manage PostgreSQL database operations including migrations, performance tuning, and backups.
## When to Use
- ✅ Schema migrations with Liquibase
- ✅ Performance optimization
- ✅ Backup and recovery
- ✅ Monitoring and alerting
## Liquibase Migrations
```xml
<changeSet id="1" author="developer">
<createTable tableName="politician">
<column name="id" type="VARCHAR(12)">
<constraints primaryKey="true"/>
</column>
<column name="first_name" type="VARCHAR(50)">
<constraints nullable="false"/>
</column>
<column name="last_name" type="VARCHAR(50)">
<constraints nullable="false"/>
</column>
</createTable>
</changeSet>
```
## Performance Tuning
```sql
-- Add indexes for frequently queried columns
CREATE INDEX idx_politician_party ON politician(party);
CREATE INDEX idx_voting_record_date ON voting_record(vote_date);
-- Analyze query performance
EXPLAIN ANALYZE
SELECT * FROM politician WHERE party = 'S' AND district = 'Stockholm';
-- Update statistics
ANALYZE politician;
```
## Backup Strategy
```bash
# Daily backups
pg_dump -h localhost -U cia_user -d cia_production > backup_$(date +%Y%m%d).sql
# Point-in-time recovery setup
wal_level = replica
archive_mode = on
archive_command = 'cp %p /backup/archive/%f'
```
## Monitoring
```sql
-- Check connection count
SELECT count(*) FROM pg_stat_activity;
-- Check slow queries
SELECT query, calls, total_time, mean_time
FROM pg_stat_statements
ORDER BY mean_time DESC LIMIT 10;
```
## References
- PostgreSQL: https://www.postgresql.org/docs/
- service.data.impl/README-SCHEMA-MAINTENANCE.md
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