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Mohammad Mahamudul Hasan

Mohammad Mahamudul Hasan

+8801628430255, hmmahamudul

Services provided: Database Migration Engineers , Database Clustering Consultants , Database Administration

Dhaka, Dhaka
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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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