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Yongsheng M
@yongsheng_mao
PostgreSQL Expert
China
Inglés, Chino
Sobre mí
With over 25 years in the database industry, I focus on SQL optimization, database performance troubleshooting, and PostgreSQL consulting, my expertise includes: ( 1. Mastering in PostgreSQL, Oracle and SQL Server database. 2. Deep-knowledge in SQL/Database Optimization. 3. Rich experiences on troubleshooting of SQL/Database Performance problems).
I have dedicated to PostgreSQL since year 2020, currently offer below services: ( 1. Tuning Inefficient SQL queries. 2. Diagnosis database performance issues. 3. PostgreSQL DBA).
Habilidades
Yongsheng M
desconectado •
Tiempo medio de respuesta: 1 hora
Revisa mis servicios
Administración de base de datos (DBA)
I will fix postgresql database bottlenecks and improve performance
Diseño y optimización
I will optimize your slow sql queries for better performance
Porfolio
Experiencia laboral
PostgreSQL Consultant
Fiverr • Freelance
Dec 2023 - Present • 2 yrs 5 mos
Supported client to do Oracle to PostgreSQL migration. Offered technical services on PostgreSQL database performance optimization.
SQL expert & performance DBA
Home Credit China • Tiempo completo
Dec 2017 - Oct 2025 • 7 yrs 10 mos
SQL Expert for SQL/Database Optimization in production OLAP(data warehouse) and OLTP (transactional) systems. Duties and Responsibilities: • Performance tuning and optimization for Oracle database and PostgreSQL database - SQL and Database performance optimization. - Database performance monitor and analysis. • Production Support for Oracle databases and PostgreSQL databases - Service Requests/Incident tickets for SQL optimization and other performance related issues. - Troubleshooting real-time database level performance hit. - Real-time SQL queries audit by identifying high cost SQLs through auto-monitor tool and manual check, provide recommendation to optimize inefficient queries. • Projects - Database Platform migration from Oracle database to PostgreSQL database - Setup HA solution (replication, auto-failover, scheduled backup，etc) for PostgreSQL database clusters.
Senior Oracle DBA
Xerox • Tiempo completo
Dec 2007 - Dec 2017 • 10 yrs
• As the SQL Performance Expert takes full responsibility on SQL performance review and optimization for production online transactions queries, online ad-hoc queries and various customer reports. • As the Database Operation Expert in charge of database architecture, design, implementation, security compliance, troubleshooting, performance tuning for mission-critical 24*7 production databases. • As the Data Architect focus on high performance-sensitive data extraction, transform, loading, archiving and purging projects; works with developers on data analysis and modeling (reverse engineering) based on business process requirements.
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redfr4me
Francia
Working with Yongsheng M was an absolute pleasure! His work in the DATABASE domain not only exceeded expectations but also showcased incredible professionalism and attention to detail. His polite nature and quick responsiveness make him a rare find in the industry. Mr. Yongsheng is CLEARLY a top 0.1%...
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