https://www.agdata.lv/blog Practical guides on PostgreSQL, MySQL and ClickHouse: migrations, performance, high availability, monitoring and incident response. en Thu, 29 Oct 2026 08:00:00 +0000 https://www.agdata.lv/blog/cloud-zone-outage-database-lessons https://www.agdata.lv/blog/cloud-zone-outage-database-lessons Thu, 29 Oct 2026 08:00:00 +0000 Architecture A power failure took a Google Cloud London zone offline for six hours. What the incident teaches about database failover, capacity and cross-zone dependencies. https://www.agdata.lv/blog/mysql-26-calendar-versioning-lts https://www.agdata.lv/blog/mysql-26-calendar-versioning-lts Thu, 29 Oct 2026 08:00:00 +0000 Migrations MySQL now uses year.month version numbers: 26.7, 26.10, and the next LTS in 2028. What changed and how to pick a MySQL version for production. https://www.agdata.lv/blog/pgbouncer-postgresql-connection-pooling https://www.agdata.lv/blog/pgbouncer-postgresql-connection-pooling Thu, 29 Oct 2026 08:00:00 +0000 Architecture How PostgreSQL connection pooling with PgBouncer works: pool modes, transaction-mode limitations, prepared statements, pool sizing and the metrics to watch. https://www.agdata.lv/blog/postgresql-14-end-of-life https://www.agdata.lv/blog/postgresql-14-end-of-life Thu, 29 Oct 2026 08:00:00 +0000 Migrations PostgreSQL 14 receives its final update on 12 November 2026, a week before PostgreSQL 19 ships. How to choose a target version and plan the upgrade. https://www.agdata.lv/blog/postgresql-security-hardening-checklist https://www.agdata.lv/blog/postgresql-security-hardening-checklist Thu, 29 Oct 2026 08:00:00 +0000 Architecture Most PostgreSQL security incidents come from basic gaps, not clever exploits. A practical hardening checklist: network, authentication, roles, encryption, auditing. https://www.agdata.lv/blog/redis-to-valkey-migration https://www.agdata.lv/blog/redis-to-valkey-migration Thu, 29 Oct 2026 08:00:00 +0000 Migrations Percona announced Valkey-proxy, an open-source proxy for Valkey clusters. What it changes for teams planning to move from Redis, and how to plan the migration. https://www.agdata.lv/blog/database-backup-restore-testing https://www.agdata.lv/blog/database-backup-restore-testing Wed, 28 Oct 2026 08:00:00 +0000 Incident Response Backups fail quietly and are discovered loudly. How to design database backups around recovery targets — and prove you can restore them. https://www.agdata.lv/blog/postgresql-high-availability-patroni https://www.agdata.lv/blog/postgresql-high-availability-patroni Wed, 28 Oct 2026 08:00:00 +0000 Architecture A replica is not high availability. What a production PostgreSQL HA setup with Patroni needs beyond streaming replication — and how to prove it works. https://www.agdata.lv/blog/postgresql-major-version-upgrade https://www.agdata.lv/blog/postgresql-major-version-upgrade Wed, 28 Oct 2026 08:00:00 +0000 Migrations PostgreSQL 14 reaches end of life in November 2026. pg_upgrade versus logical replication: what each costs in downtime, risk and effort. https://www.agdata.lv/blog/postgresql-slow-query-tuning-checklist https://www.agdata.lv/blog/postgresql-slow-query-tuning-checklist Wed, 28 Oct 2026 08:00:00 +0000 Monitoring Most slow PostgreSQL databases are slow for the same handful of reasons. The checklist we work through before anyone talks about bigger hardware. https://www.agdata.lv/blog/reduce-aws-rds-aurora-costs https://www.agdata.lv/blog/reduce-aws-rds-aurora-costs Wed, 28 Oct 2026 08:00:00 +0000 Architecture Cloud database bills grow quietly. Where Amazon RDS and Aurora spend really comes from, where to look first — and what you should not cut. https://www.agdata.lv/blog/zero-downtime-postgresql-migrations https://www.agdata.lv/blog/zero-downtime-postgresql-migrations Thu, 18 Jun 2026 08:00:00 +0000 Migrations "Just take a maintenance window" isn't an acceptable answer anymore. Here's the logical-replication pattern we use to cut over production PostgreSQL clusters without customers noticing. https://www.agdata.lv/blog/database-metrics-that-predict-incidents https://www.agdata.lv/blog/database-metrics-that-predict-incidents Fri, 22 May 2026 08:00:00 +0000 Monitoring CPU and memory graphs tell you a database is unhealthy after the fact. These five signals — tracked as trends, not snapshots — tell you before your users do. https://www.agdata.lv/blog/mysql-to-postgresql-migration-guide https://www.agdata.lv/blog/mysql-to-postgresql-migration-guide Thu, 30 Apr 2026 08:00:00 +0000 Migrations "Migrate to Postgres" is popular advice, not universal advice. A practical framework for deciding whether the switch is actually worth the risk for your workload. https://www.agdata.lv/blog/clickhouse-data-warehouse-legacy-data https://www.agdata.lv/blog/clickhouse-data-warehouse-legacy-data Thu, 02 Apr 2026 08:00:00 +0000 Architecture Most companies are sitting on years of transactional history that's functionally unqueryable. Here's how we design the schema and backfill strategy to make it useful again. https://www.agdata.lv/blog/database-incident-response-15-minutes https://www.agdata.lv/blog/database-incident-response-15-minutes Thu, 12 Mar 2026 08:00:00 +0000 Incident Response A response-time SLA sounds like a marketing line until you break down what has to happen in those 15 minutes — and how much of it was decided long before the alert fired.