10/25/2026 updated
100 % available
Senior SQL Server Consultant | Stability, Performance, HA & Troubleshooting
Voula, Greece
Worldwide
State-certified Technical Engineer, specializing in Data ProcessingAbout me
Senior SQL Server Consultant with 20+ years of experience in performance, troubleshooting, high availability, migrations and operational stability. I help companies resolve complex database issues and build reliable, maintainable SQL Server environments.
Business Continuity and Disaster RecoveryDisaster RecoveryFailover ClusteringMicrosoft SQL ServersAzure SQLWindows ServersSQL Server Management StudioPerformance TuningWindows PowerShellServer AdministrationSQL DatabasesSQL Server AgentTransact-SQLBackup and RestoreHigh Availability Clusters
Senior SQL Server Consultant with more than 20 years of experience in SQL Server infrastructure, performance tuning, troubleshooting, high availability, database operations and migration projects.
My focus is on stabilizing critical SQL Server environments, identifying root causes of performance and availability issues, and implementing sustainable technical improvements.
Core skills include Microsoft SQL Server administration, performance analysis, query tuning, wait statistics, blocking and deadlock analysis, execution plans, indexing, SQL Server Agent, backup and restore, recovery readiness, patching, upgrades and migrations.
Extensive experience with SQL Server Failover Cluster Instances, Always On Availability Groups, Windows Server Failover Clustering, log shipping, replication, disaster recovery and high availability concepts.
Additional experience includes Azure SQL Database, Azure SQL Managed Instance, hybrid SQL environments, PowerShell, dbatools, T-SQL, Windows Server, virtualization, storage analysis, monitoring and production support.
I support customers with complex SQL Server incidents, infrastructure bottlenecks, database platform modernization, operational stabilization and technical assessments.
Experience
Professional experience10+ years
Freelancer since2022
Languages
GermanNative speakerEnglishFluentGreekBasic knowledgeItalianBasic knowledgeSpanishGood
Project history
Technical assessment and planning of a SQL Server upgrade and platform modernization for a business-critical production environment.
Key responsibilities:
- Review of SQL Server versions, editions and cumulative update levels
- Identification of outdated or unsupported SQL Server components
- Analysis of database, application and infrastructure dependencies
- Assessment of current CPU, memory, storage and database sizing
- Evaluation of high availability and failover requirements
- Development of upgrade and migration options
- Planning of implementation, testing and rollback procedures
- Preparation of recommendations for the future SQL Server platform
- Coordination with infrastructure, application support and external service providers
Technologies:
Microsoft SQL Server 2016–2022, Windows Server, SQL Server Failover Clustering, T-SQL, PowerShell, patching, upgrade planning, migration planning, capacity planning
Result:
Developed a structured modernization concept covering SQL Server version, patch level, infrastructure sizing, storage design and operational requirements for a more stable and maintainable future platform.
Analysis and stabilization of a business-critical SQL Server failover cluster hosting multiple SQL Server instances on a virtualized infrastructure.
Key responsibilities:
- Analysis of SQL Server instance distribution across the cluster nodes
- Review of memory allocation and resource utilization
- Assessment of failover capacity and operational risks
- Analysis of backup storage consumption and retention requirements
- Troubleshooting of failed SQL Server maintenance and backup jobs
- Capacity planning for RAM and backup storage
- Development of recommendations for workload redistribution
- Technical coordination with infrastructure and application teams
Technologies:
Microsoft SQL Server, Windows Server Failover Clustering, SQL Server Failover Cluster Instances, PowerShell, dbatools, Ola Hallengren Maintenance Solution, Nutanix, Windows Server
Result:
Developed a structured optimization concept to improve cluster stability, resource allocation and backup capacity.
Analysis of recurring performance issues and application outages in a historically grown SQL Server environment hosting several business-critical components on a shared virtual machine.
Key responsibilities:
- Analysis of SQL Server error logs and Windows event logs
- Identification of database, storage and infrastructure bottlenecks
- Review of CPU, memory and storage configuration
- Analysis of database growth, large tables and abnormal space consumption
- Assessment of SQL Server version, edition and patch level
- Evaluation of workload distribution and resource contention
- Development of immediate stabilization measures
- Preparation of recommendations for a future SQL Server platform redesign
- Coordination with infrastructure and application support teams
Technologies:
Microsoft SQL Server 2016, T-SQL, SQL Server Error Log, Windows Server, VMware, performance analysis, storage analysis, capacity planning
Result:
Identified structural risks and resource bottlenecks in the existing environment and developed recommendations for short-term stabilization and a properly sized future SQL Server platform.