LinkedInDavid Yahalom

David Yahalom

CTO, Oracle, BigData & Hadoop expert

Information Technology and Services
  1. NAYA Technologies,
  2. ILOUG
  1. Veracity Group,
  2. Govermental,
  3. Xpert One1
  1. Oracle University Certified
  1. 8 people have recommended David

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NAYA Technologies

NAYA Technologies



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I'm a CTO, Oracle / BigData / NoSQL DBA group founder, lead architect and hands-on database consultant living my passion.

Hands on expert - Oracle, Hadoop/Cloudera, Amazon EMR, MSSQL, MySQL, PostgreSQL, MongoDB

Oracle Database Certified Specialist.
Cloudera Hadoop BigData Certified Professional.

International lecturer for Cloudera Hadoop and Oracle courses.

Over 12 years of experience in database & information systems architecture design, leading database teams and as a database consultant / DBA.

- Some of the global customers for which I've provided consulting include AT&T, Sprint, Amdocs, CITI Bank, Bank of America, Wells Fargo / Wells Fargo Securities, Oracle, JP Morgan, BP...

- Senior manager, founder and CTO in charge of the technological vision and Oracle/NoSQL/BigData delivery of Israel's largest DB consulting company managing over 15 people.

- Database "​in the cloud"​ expert - Azure and Amazon EC2 implementation specialist for Oracle and Cloudera Hadoop.

- Responsible for end to end delivery of database related projects and leading teams in various complex and diverse enterprise-level environments.

- Providing support and consulting for over 60 different corporations in Israel and across the world.

- Go-to-guy for pre-sales technical discussions for both Oracle IL and Microsoft IL.

- Database security expert:

Leading Oracle Security projects including: DB hardening, TDE, Database Vault, Sentrigo Database Firewall, externally identified users, etc..

- Database performance tuning expert:

In-depth experience with Oracle database tuning for very large and high-TPS databases for both real time and batch environments including some of the world's largest databases.

- Database high availability expert:

In-depth experience with Oracle GoldenGate for realtime BI, zero downtime database upgrades as well as ACTIVE/ACTIVE high-availability.

Planning and implementing complex Oracle RAC and DRP (DataGuard, GoldenGate and storage replication) solutions.



NAYA Technologies
– Present (5 years 2 months)

- CTO and hands-on founder of the Oracle / NoSQL /BigData group for Israel's largest database consulting company providing professional consulting services for customers worldwide including global customers such as AT&T, Amdocs, CITI Bank, Bank of America, Wells Fargo / Wells Fargo Securities, Oracle, JP Morgan, BP...

- Oracle Database Certified Specialist

- Cloudera Certified BigData Professional

- Microsoft Certified Azure Cloud Platform consultant.

- International instructor for Cloudera Hadoop and Oracle courses.

- In charge of the day to day management, technological vision and technological delivery of the database consulting group in the following database technologies:

- Oracle database.
- Implementation specialist for Oracle Exadata and Oracle Database Appliance engineered solution.
- Hadoop, Cloudera Hadoop, Amazon EMR.
- Kafka and Amazon Kinesis expert.
- Extensive experience working with Flume / Sqoop / Hive / PIG / Impala.
- Design, deploy and manage databases in Amazon EC2 and Microsoft Azure, including DR and HA solutions.
- PostgreSQL.
- MySQL.
- Cassandra.
- MongoDB.
- Couchbase.
- Microsoft SQL Server.

- Responsible for the technological vision and architecture design & hands on implementation for all Oracle / BigData projects.

- Oracle Database and Hadoop lecturer and trainer at Oracle Israel's largest yearly public event - OracleWeek.

- Directly responsible for a team of over 15 expert consultants.

Board Member

– Present (1 year)

Head of H.A technologies

Veracity Group
(1 year 1 month)


(1 year 11 months)

Directing a database oriented organization in terms of short and long term technological strategy, infrastructure design, vendor choice and partnership, product selection, creating internal technological procedures and managing customer satisfaction levels.

Senior Database Project Manager

Veracity Group
(2 years)

Re-architecture, overhauling and tuning one of the world's largest cellular billing databases running on a massively parallel Itanium-based HP Superdome.

Leading complex and diverse database infrastructure design projects and writing detailed design documents.

Leading and implementing migration from single instance databases to complex Oracle RAC + DataGuard configurations.

Researching MPP database solutions such as Hadoop and Greenplum.

Designing complex MySQL implementations and complete MySQL-based architectures for critical 24X7 operations including DRP and scale-out replication, backup and recovery strategies and performance scaling.

Leading database virtualization projects based on the VMWARE ESX platform.

Leading Oracle Security projects including: KERBEROS, TDE, Oracle Database Vault, Sentrigo, strong authentication, externally identified users.

Leading extreme large scale Oracle Grid Control deployments for proactive monitoring of enterprise organizations.

Providing performance tuning, schema design and modeling for various development teams.

Writing dozens of short tech tips and published articles via my blog:

Go-to-guy for pre-sales technical discussions.

Cross-platform Oracle performance benchmarking and datacenter migration.

Experience with Oracle Advanced Replication.

Writing Custom Grid Control plugins.

Designing Oracle storage frameworks using NetAPP and ASM.

Extensive experience with Linux/Unix.

Leading system acceptance testing projects.

Senior Database Consultant & DBA Expert

Xpert One1
(1 year 3 months)

Senior Oracle DBA and consultant for Enterprise level organizations.

Administrating and supporting critical 24X7 Oracle databases including multi-million users web configurations.

Designing , implementing and migrating complex Oracle RAC configurations.

Planning and implementing DRP with Oracle DataGuard.

Hardening Oracle & implementing DB firewalls inc. Sentrigo Hedgehog.

Implementing NETAPP storage fillers in Oracle RAC configurations.

Proactive monitoring using Oracle Grid Control.

Designing and implementing Oracle backup strategies, RMAN scripting and storage snapshots.

Extensive experience in Linux and UNIX environments.

Technologies Presenter at IOUG & Instructor at John Bryce training.

Providing performance tuning, schema design and modeling for various development teams.

Writing dozens of short tech tips and published articles.

Go-to-guy for pre-sales technical discussions.

Cross-platform Oracle performance profiling, benchmarking.

Database Consultant & DBA

(1 year 2 months)

Oracle consultant for various Enterprise and SMB level organizations on Windows and UNIX platforms.

Designing and supporting an ETL data consolidation process from several legacy
systems to a central open database.

Providing ongoing long term database support, tuning and schema design consulting for a large development team.

Designing and supporting backup and recovery strategies of VLDB oracle databases.

Experience in working with RMAN for complex backup procedures.

Extensive Instance and SQL tunning in VLDB OLTP environments.

Lead DBA of a VLDB DB2 LUW financial project.

Experience in Cognos 8.

Team Leader & DBA

(4 years 2 months)

Team Leader and Oracle DBA in a large DSS and OLTP environment.

Day to day installation, administration, support and configuration of various large Oracle databases.

Designing and implementing Oracle backup and recovery strategies.

Designing and modeling Business Objects universes in an HR environment.

Designing, implementing and supporting a complex ETL process from a legacy IBM MF to an open Oracle database.

Extensive Instance and SQL tunning in VLDB OLTP environments.

Writing and maintaining PL/SQL stored procedures.

Writing VB front ends to PL/SQL database logic.

Writing Perl scripts.

Leading an ERP project.


Oracle Israel professional newsletter



  1. English

    Native or bilingual proficiency
  2. Hebrew

    Native or bilingual proficiency



Oracle University Certified

Oracle Database

Honors & Awards

Company MVP 2003
Company MVP 2006
Company MVP 2008

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