Sibesh Biswal
Summary
Experienced Oracle L3 Database Administrator with 10+ years in managing, securing, tuning, and migrating large-scale databases in banking and telecom. Proficient in Oracle 11g/12c/19c, Multitenant architecture, RAC, GoldenGate, Data Guard, and OCI cloud environments. Demonstrated success in performance optimization, high-availability setups, disaster recovery planning, and automation. Currently maintaining critical systems for Citibank at Wipro, ensuring stability, compliance, and business continuity.
Overview
10
10
years of professional experience
1
1
Certification
Work History
Oracle L3 DBA (Lead Administrator)
Wipro Technologies – Client: Citibank
12.2021 - Current
- Delivered advanced L3 support for highly available production environments featuring RAC and Data Guard.
- Led major upgrades from Oracle 11g/12c to 19c, ensuring zero data loss and rollback readiness as per compliance protocols.
- Executed complex database migrations under Citibank's Tech Refresh program, including TDE-enabled databases and Multitenant migrations.
- Deployed and managed Oracle GoldenGate Microservices Architecture in a centralized hub model.
- Oversaw full lifecycle management of OCI-hosted databases: provisioning, scaling, patching, and DR setup.
- Conducted deep-dive performance tuning for transaction-intensive applications.
- Automated health checks and alerting using shell scripts integrated with OEM.
- Managed high-severity incident resolution (P1/P2), reducing MTTR by 30%.
- Coordinated production deployments and DR drills.
Senior Oracle DBA (Senior Consultant)
Capgemini – Client: HSBC Bank
07.2019 - 11.2021
- Supported Oracle 11g/12c/19c environments with RAC and Data Guard.
- Administered Exadata X8/X8M platforms.
- Led upgrades to Oracle 19c and multitenant architecture migrations.
- Performed on Prem to OCI migrations using Oracle ZDM.
- Managed performance and provisioning on OCI VM DB Systems.
- Built resilient Data Guard topologies for DR readiness.
- Handled refreshes, cloning, tuning, and compliance audits.
- Implemented quarterly patching and automation with shell and Control-M.
- Administered Oracle databases, ensuring optimal performance and availability for critical banking systems.
Oracle DBA / GoldenGate Engineer (Analyst)
Accenture – Client: AT&T
04.2015 - 06.2019
- Delivered L2 DBA support across more than 100 Oracle databases, enhancing system performance and uptime.
- Conducted schema refreshes, database cloning, and in-depth SQL performance analysis to optimize queries.
- Set up GoldenGate replication configurations while troubleshooting replication challenges to ensure seamless data flow.
- Assisted in infrastructure migrations and implemented automation solutions using shell scripting techniques.
- Engaged in continuous improvement initiatives to refine database processes and enhance service delivery.
Education
B.Tech - Electronics & Instrumentation Engineering
Institute of Technical Education And Research
01.2014
Skills
- Databases: Oracle 19c,12c,11g,PostgreSQL
- Cloud Platforms: Oracle Cloud Infrastructure (OCI)
- High Availability & Replication: Oracle RAC, Data Guard, GoldenGate (Classic & MA), Exadata X8/X8M
- Backup & Recovery: RMAN, Flashback, Data Pump, OSB, Rubrik
- Performance Tuning: AWR, ADDM, ASH, TkProf,SQL Baselines, Tuning Advisors, SolarWinds DPA
- Automation & Scripting: Linux Shell Scripting, SQL, PL/SQL
- Monitoring & DevOps: OEM 13c,12c, Jenkins, Control-M, AppDynamics
- Tools: ZDM, AutoUpgrade, Toad, Sql Developer, Jira, Confluence, ServiceNow
Certification
- Oracle Certified Professional (OCP) – Oracle 19c
- OCI Foundations / OCI AI Associate
- OCI Cloud Database Professional (In Progress)
- Multiple Oracle & GoldenGate Certifications (Udemy)
- Client/Project Appreciation Awards
Timeline
Oracle L3 DBA (Lead Administrator)
Wipro Technologies – Client: Citibank
12.2021 - Current
Senior Oracle DBA (Senior Consultant)
Capgemini – Client: HSBC Bank
07.2019 - 11.2021
Oracle DBA / GoldenGate Engineer (Analyst)
Accenture – Client: AT&T
04.2015 - 06.2019
B.Tech - Electronics & Instrumentation Engineering
Institute of Technical Education And Research
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