https://www.isquiz.com/tags/high-availability/Recent content in High Availability on iSquiz.comHugo -- gohugo.ioeniSquiz.comSun, 25 Oct 2026 00:00:00 +0000https://www.isquiz.com/post/single-server-database-high-availability/Sun, 25 Oct 2026 00:00:00 +0000https://www.isquiz.com/post/single-server-database-high-availability/ <p>A small business keeps its orders, invoices and customer list in one <a href="https://www.postgresql.org/docs/current/high-availability.html">PostgreSQL</a> server. If that machine stops, nothing takes over. Moving to a managed host does not fix that by itself, because <a href="https://docs.cloud.google.com/sql/docs/postgres/high-availability">Cloud SQL doesn't recover standalone instances from a zonal outage automatically</a>. PostgreSQL's own <a href="https://www.postgresql.org/docs/current/warm-standby.html">streaming replication is asynchronous by default</a>, so a standby does not guarantee zero data loss either.</p> <hr> <h2 id="what-a-single-database-server-puts-at-risk">What a single database server puts at risk</h2> <p>High availability means <a href="https://www.postgresql.org/docs/current/high-availability.html">database servers working together so a second server can take over quickly if the primary fails</a>. A standby that accepts no connections until it is promoted is a warm standby. One that accepts connections and serves read-only queries is a hot standby. In PostgreSQL 18 the <a href="https://www.postgresql.org/docs/current/runtime-config-replication.html"><code>hot_standby</code> setting is on by default</a>, so a standby can answer queries while it replays changes from the primary.</p>