Databases sql Intermediate

MySQL Replication Status Check

Script to check MySQL/MariaDB replication lag and alert if it exceeds threshold.

sql

-- On replica
SHOW REPLICA STATUS;

-- Shell script to check lag
#!/bin/bash
LAG=$(mysql -u root -proot -e 'SHOW REPLICA STATUS' | grep Seconds_Behind_Source | awk '{print $2}')
if [ $LAG -gt 30 ]; then
  echo WARN: Replication lag ${LAG}s
fi

Prerequisites

MySQL >= 8
Replication configured

Pro Tips

→ Alert when lag > 30s for write-heavy apps.

Was this module useful?

Share your experience — it helps the team improve.

Leave Feedback

Commercial Licensing

Acquire a production access token or template license for enterprise deployment.

Module Info

Language: sql
Level: Intermediate
Read time: 3 min
Published: Sep 2026
License: Commercial License

New modules every week, directly to your inbox.

Similar Modules

DB Connection Pool Monitor

Query to check active connections, idle connections and pool usage in PostgreSQL.

sql · Intermediate

Cursor-based Pagination Query

Implement cursor-based (keyset) pagination in SQL — faster than OFFSET for large tables.