Mohammad Mahamudul Hasan
Services provided: Database Migration Engineers , Database Clustering Consultants , Database Administration
About Mohammad Mahamudul Hasan:
𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗲𝗱 with 11+ years of experience in Database Administrations. Managed OLTP, WEB database having 24*7 activities. Extensive experience designing and supporting heterogeneous database solutions utilizing Oracle, MSSQL, MySQL, PostgreSQL, MariaDB, MongoDB technologies. |
𝗢𝗥𝗔𝗖𝗟𝗘 - Monitoring & performance tuning using OEM, TOAD, SQL Developer, TKProf, Explain Plan, AWR, ADRCI, ADDM, ASH, AHF - Upgradation, Migration, Patching & bug fixing. - Backup & Recovery - ASM (clusters) and RAC configuration and administration - Golden Gate (Data Replication) - Security: TDE / Audit Vault and Database Firewall (AVDF) / Database Vault (DV) - Data Guard installation/administration for High availability |
𝗦𝗤𝗟 𝗦𝗘𝗥𝗩𝗘𝗥 - Monitoring & performance tuning using OEM, DBCC, Tuning Advisor (DTA), - Error Logs, Extended Events, Dynamic Management Views, and Functions (TSQL), Query Statistics, System Monitor, Performance Dashboard, Query Tuning Assistant, Explain Plan, Query Store, SQL Profiler, SQL Trace. - HA& DR: Log shipping, Database Mirroring, Windows Clustering, always on, Replication - Upgradation, Migration, Patching & bug fixing. - Security: TDE / Auditing - Backup & Recovery |
𝗠𝘆𝗦𝗤𝗟 - Monitoring & performance tuning using Enterprise monitoring, Workbench, Performance Dashboard, Performance Schema Reports, Query Statistics, Explain Plan, Slow Query Log. - HA& DR: Innodb Replicaset, Innodb Clusterset, NDB cluster, replication master/slave, master/master, managing complex replication topology - Security: TDE / Auditing / Encryption / Firewall / Data Masking - Upgradation, Migration, Patching & bug fixing. - Enterprise backup. |
𝗠𝗼𝗻𝗴𝗼𝗗𝗕 - Monitoring & performance tuning using Ops manager, Mongostat, Mongotop, serverStatus, dbStats, collStats, replSetGetStatus, Performance Advisor, Profiler, Explain Plan. - HA& DR: MongoDB Replica Sets - Security: Auditing / Encryption / Authentication - Upgradation, Migration, Patching & bug fixing. - Backup & Recovery. PostgreSQL - Customize Installation & Configuration. - Monitoring performance & diagnosing any issues. - Backup recovery & upgradation |
Experience
BRAC Bank Ltd - Manager, Sr. Principal Officer (DBA) Since December 15, 2022–Till Date Job Responsibilities ◼ Delivering expert-level DBA services including monitoring their databases, making recommendations to improve performance and durability, fix things when they break, help design new architectures and implement best practices, perform upgrades, configure and monitor backups, assist with recoveries, and other related DBA-level tasks as needed. ◼ Responsibility for maintaining the integrity and performance of company databases. ◼ Must guarantee that data is stored securely and optimally. ◼ Ensuring the security of company data ◼ Ensure optimal application performance for the bank’s database systems. ◼ Profile server resource usage, optimize and tweak as necessary. ◼ Collaborate with other team members and stakeholders. SBAC Bank Ltd - Sr. Executive Officer (DBA) since 12th August 2021- December 14, 2022 Job Responsibilities ◼ Ensure all database servers are backed up in a way that meets the business’s Recovery Point Objectives (RPO) ◼ Test backups to ensure we can meet the business’ Recovery Time Objectives (RTO) ◼ Troubleshoot Database Server service outages as they occur, including after-hours and weekends. ◼ Configure Database Server monitoring utilities to minimize false alarms. ◼ Install and configure new Database Servers ◼ Deploy database change scripts provided by third party vendors. ◼ When performance issues arise, determine the most effective way to increase performance including hardware purchases, server configuration changes, or index/query changes. |
Standard Bank Ltd - Executive Officer (DBA) since 27th December 2018 - 11th August 2021 Job Responsibilities ◼ Follow up and assigned the day-to-day tasks. SBL Core Database (Oracle RACDB, ADG, SQL Server 2016, MySQL) as well as Test Database Troubleshooting and Monitoring. ◼ Implement and Manage OEM 13c on OEL 7. ◼ Implemented & Configured ADG on Oracle 12c for BACH service. ◼ Scripting (Shell) of automated backup for Cold & Hot backup and defining and setting backup and recovery procedures. ◼ Capacity planning for newly install server. ◼ Implementing and manage WLS 12.2 clustering. ◼ Implementation and managed system center on windows server 2016. ◼ Manage Hyper-V on Windows 2016 R2. ◼ Migration AD from windows 2008 to windows 2016. ◼ Ensure Database Availability as well as high availability. ◼ Develop, manage, and test back-up and recovery plans. ◼ Install, configure, and test new versions of the database management system (DBMS). ◼ Communicate regularly with technical, applications and operational staff to ensure database integrity and security. ◼ Manage the security and disaster recovery aspects of a database. ◼ Monitor performance and manage parameters in order to provide fast responses to front-end users. ◼ Defining users and enabling data distribution to the right user, in appropriate format and in a timely manner ◼ Ensure backup/recovery using third party tape backup |
Social Islami Bank Ltd - Senior Officer (DBA) since April 27, 2016-December 26, 2018 Job Responsibilities ◼ Installed Solaris 11.3 on SPARC T7-1. ◼ Architecting, planning, designing, developing, deploying and supporting RAC on ASM environment ◼ Installing & configuring Oracle clusterware & Database Software on Solaris 11.3 SPARC (Troubleshooting using cluvfy & handling common issues that arise during integration of the whole – bugs, network issues, configuration files issues, OCR issue, deinstallation & cleanup of clusterware) ◼ Migrate Oracle Database 11.2 from Aix-6.1 to Solaris Sparc 11.3. ◼ Implement & manage Commvault Backup Solution. ◼ Oracle Data Vault Installation and configuration. ◼ Oracle encrypted & compressed backup procedure. ◼ RMAN backup & recovery. ◼ Oracle RAC database, Dataguard maintenance, performance tuning and ensuring backup and restore backup. ◼ Managed Vmware vSpare 6.5. ◼ Implement & manage Vmware NSX 6.3 |
Newgen Technology Ltd - DBA since Jun11, 2015-April 26, 2016 Job Responsibilities ◼ Worked on a project of EBS 12.1 Implementation and Business Continuity for Oracle E-Business Suite Release 12.1 Using Oracle 11g Release 2 with Physical Standby Database, EBS support. ◼ Provide 24*7 Database support to various clients. ◼ Monitored performance of Oracle and MySQL DB. ◼ Migration MySQL DB to Oracle. |
Sonali Polaris Financial Technology Limited - Junior Consultant since October 2012 – Jun 10, 2015 Job Responsibilities ◼ Advanced Backup and Recovery using Oracle’s RMAN software; used offline/online for recovery in a production environment via shell scripting. ◼ Ongoing proactive database-level performance tuning, with a good working knowledge of Oracle internals. ◼ Implemented High availability using Golden Gate Replication. Implanted Bi-directional replication using golden gate. ◼ Implemented Stream, Golden Gates for Active-Active Replication between the Datacenter for High Availability. ◼ Guided team to use existing infrastructure to achieve Maximum benefit to reduce cost and maximum performance. ◼ Implemented and maintained Oracle 10g/11g Data Guard/standby databases for fail-over purposes. ◼ Replicated to a disaster recovery site for increased server manageability and availability. ◼ Participated in development of enterprise-wide security standard methodology, and ongoing deployment. ◼ Installation of RAC and Managing RAC Environment efficiently. ◼ Database tuning, performance monitoring. Fine tuning Initialization parameters, I/O, Memory and Operating System kernel parameters. ◼ Managed appropriate use of free space within tablespaces, reclaimed space whenever possible. Reorganized tables and indexes within databases when needed. |
British American Tobacco, Bangladesh - Database Support Engineer since May 2012 – September 2012 Job Responsibilities ◼ Installation and implementation of the Oracle9i,11g on Windows Server 2008 ◼ Migrate Production Server from Oracle 9i to Oracle 11g Using export import technology. ◼ Manage the database. ◼ Implement the automated hot backup scripts for the Daily full backup. ◼ Changes were made dynamically whenever possible to fulfill high availability requirements. ◼ Implemented and maintained database security (create and maintain users, roles and assign privileges) ◼ Database tuning & performance monitoring. Fine tuning Initialization parameters, I/O, Memory and Operating System kernel parameters. ◼ Managed appropriate use of freespace within tablespaces, reclaimed space whenever possible. Reorganized tables and indexes within databases when needed. ◼ Monitored the production Oracle alert logs for database errors and system resource availability and responded to system memory and data issues. |
Education
Master's in Computer Science
Master's In Physics
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