Fixing the MariaDB Galera Bug: WSREP Lock Waits

A MySQL deadlock occurs when two or more transactions hold locks that each other needs, creating a circular dependency that prevents them from proceeding. InnoDB detects the deadlock and rolls back one transaction; applications typically receive MySQL error 1213 and should safely retry the transaction. To diagnose a deadlock, start with SHOW ENGINE INNODB STATUS; for recurring incidents, use innodb_print_all_deadlocks and Performance Schema data_locks and data_lock_waits to investigate lock relationships. Common causes include inconsistent transaction ordering, long-running transactions, and inefficient indexing or locking patterns. The most effective fixes are to keep transactions short, access shared resources in a consistent order, optimize the indexes used by locking statements, and implement safe retry handling.

Choose an in-house DBA when you need continuous database ownership, deep knowledge of internal systems, and day-to-day operational control. Choose MySQL consulting when you need specialized expertise, performance tuning, migrations, complex troubleshooting, or additional database capacity without hiring a full-time specialist. A hybrid model can be the best fit when your team handles routine database operations internally but needs external expertise for complex projects, peak workloads, or specialized MySQL problems. The right choice depends on workload consistency, technical complexity, required coverage, internal expertise, scalability, and total cost—not simply the hourly or salary cost. Mafiree's managed database services provide ongoing MySQL support alongside specialized database expertise for organizations that need more flexibility than a purely in-house model.

Most MySQL slowdowns are fixable in-house. A smaller set of problems keep coming back, keep growing, or sit outside what routine tuning can solve — and that's the line worth knowing before an incident forces the decision for you.

MySQL performance issues are rarely sudden — they build over time through slow queries, InnoDB buffer pool misses, replication lag, lock contention, thread pile-ups, tablespace bloat, and unstable query plans. This post identifies the seven most reliable signs that your MySQL environment needs professional DBA attention, with diagnostic queries and remediation guidance for each.

Column-level security is a native database feature that restricts access to specific table columns by user role. Mafiree implemented this for a client as a cost-effective replacement for a planned CDC replication architecture that existed solely to strip sensitive columns. The result: zero additional infrastructure, single source of truth, full GDPR/HIPAA compliance posture, and validated in production with no performance impact.

Schema changes on large MySQL tables can bring production systems to a halt if not handled correctly. This case study walks through how Mafiree helped a fintech client execute a zero-downtime MySQL schema migration on a 500M+ row production database — covering the real challenges faced, the three-phase tool strategy using gh-ost, pt-online-schema-change, and MySQL 8.0 INSTANT DDL, production configuration settings with performance benchmarks, and best practices for safely evolving your MySQL schema without impacting users

MySQL features a unique tiered architecture that separates query processing from data storage through its pluggable storage engine model. This guide explores the core components—from connection handling and the SQL optimizer to the physical storage of data on disk. By understanding how engines like InnoDB provide ACID compliance and row-level locking, you can significantly improve your database's scalability. We also break down the query execution workflow and provide actionable tips for performance tuning, such as optimizing the buffer pool. Whether you're managing a replica set or a standalone instance, mastering MySQL’s internal structure is essential for building high-performance applications.

Discover how MariaDB 11.x is redefining open-source databases with cutting-edge features like system-versioned tables, native AI-ready vector support, UUIDv7 for scalable inserts, and enterprise-grade security; all in the Community Edition, without the paywall.

“Fortify Your MySQL Security: Slow Down Attackers with Connection Control Plugin” Learn how the MySQL Connection Control Plugin helps defend against brute-force login attempts by introducing intelligent, progressive delays—without locking out legitimate users.

Explore the 8 critical changes in MySQL 8.4 you need to know before migrating your production environment. From authentication updates to InnoDB defaults, this release brings significant operational implications for developers and DBAs.

Optimize MySQL traffic with MySQL Router — smart load balancing made easyRouter Architecture image widget

Master Database Integrity with Check Constraints: Improve Data Quality and System Performance

How to Secure your mysql database with the mysql validate password component

Discover how MySQL 8 enhances security through features like password expiry, password validation, account lock/unlock, privilege management, and dual passwords. Safeguard your valuable data and streamline access control in your MySQL environment.

How Generated Invisible Primary Keys (GIPK) Can Boost Your Database Efficiency

This blog highlights the some of the important JSON function in MySQL 8.0 with examples. Level up your SQL skills with MySQL 8.0's JSON functions.

Importance of audit log in MySQL, MariaDB and ProxySQL. Best practices to enable audit log

Auto slave promotion without any DBAs intervention using Orchestrator and ProxySQL. If you are looking for a HA solution without going for synchronous replication or Aws RDS then Orchestrator with ProxySQL is a great choice.

MariaDB Spider is a storage engine that supports federation and sharding across multiple MySQL or MariaDB servers. It helps distribute data and workloads, making it useful for scaling large datasets, balancing traffic, and improving data retrieval through parallel processing.

Dealing with deadlocks, certification failures on Galera cluster by running single node writer using ProxySQL

Choosing the right MySQL character set is critical for ensuring accurate data storage, multilingual support, and proper text comparison. While the legacy utf8 (utf8mb3) character set supports only up to 3-byte characters, it fails to handle modern Unicode requirements such as emojis and certain international symbols. In contrast, utf8mb4 provides full 4-byte Unicode support, making it the recommended standard for modern applications. This guide explains the differences between UTF8MB4 and UTF8, their impact on storage and performance, and provides step-by-step instructions to configure and migrate your MySQL databases safely.

How real time data from transactional database(mariadb) to analytic database(columnstore) is achieved using MariaDB's maxscale binlog streaming