Database testimony practice
Database Expert Witness for Federal and National Matters
Party-retained analysis and testimony on Oracle, Microsoft SQL Server, PostgreSQL, MySQL and cloud databases for federal court, MDL and arbitration: transaction logs, audit trails, schema history and FRCP 30(b)(6) database custodian testimony.
The engagement
A DBA-level opinion on what the database actually recorded
Federal court database disputes turn on what the database actually recorded, how long it kept the record and what the produced extract does and does not reflect. When FRCP 30(b)(6) testimony reaches database systems, a party's designated database witness is expected to describe the schema, the audit configuration and the query logic on the record. An independent expert can analyze the same technical record, support preparation at counsel's direction or address a disputed technical account.
The examination looks at the schema, the audit and change-data-capture configuration, the transaction-log retention actually in effect for the relevant period, the produced extracts and the queries that generated them. Where the matter turns on a specific transaction or a specific timeline, the underlying records are reproduced from the archive log or the audit table and reconciled against the export. Where reproduction is not possible, the reproducibility gap is stated in the report.
Subject matter coverage includes commercial disputes turning on transaction history, healthcare and financial-services matters with per-row audit requirements, e-commerce and marketplace disputes, contract-formation matters keyed to timestamps and revision history, and multi-district litigation with coordinated production from many database instances. Coverage across Oracle, Microsoft SQL Server, PostgreSQL, MySQL, MongoDB, Snowflake, BigQuery and Redshift where the record supports it.
Scope
Technical support for FRCP 30(b)(6) database testimony
Independent analysis of the schema, audit configuration, transaction-log retention, backup and recovery posture, and query logic used to generate produced extracts. The work is grounded in database configuration exports, not narrative descriptions, and supports counsel without replacing the party's designated witness.
Transaction and archive-log analysis
Analysis of Oracle redo and archive logs, SQL Server transaction log and Change Data Capture, PostgreSQL WAL, MySQL binary log and cloud-database change streams. Reconciliation of specific rows and specific transactions against the archived log where retention allows.
Audit-trail and change-data-capture review
Review of Oracle Unified Audit, SQL Server SQL Audit, PostgreSQL pgaudit, MySQL audit plugin coverage, and application-level audit tables. Written statement of what was actually being audited during the relevant period versus what the schema theoretically supported.
Production sufficiency and query-methodology analysis
Independent execution of the query logic that generated the produced extract on a preserved snapshot where the record allows. Analysis of joins, filters, aggregations and any post-processing to state whether the extract reasonably reflects the underlying data.
Schema and code review
Schema change history from source control or migration tools, stored-procedure and trigger review, application-layer data-access review where the record supports it. Written opinion on how the schema evolved across the relevant period.
Cloud database expert testimony
Snowflake, BigQuery, Redshift, RDS, Aurora, Cloud SQL and Azure SQL analysis: warehouse audit history, time-travel and fail-safe availability, cross-account share history and provider-side retention. Reproducibility subject to preserved snapshots and time-travel windows.
Rebuttal, cross-examination and Daubert support
Independent review of opposing database expert reports and workpapers. Rebuttal declarations, cross-examination question sets for database administrators and application engineers, and Daubert motion declarations on database subject matter.
Methodology
How the database expert engagement runs
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Retention and database scope
Retention letter, conflict check across database vendors and cloud providers, and a scope note stating the database platforms, review period, and subject matter the opinion will address.
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Schema, audit and log reconciliation
Reconciliation of the produced extracts against the schema, the audit configuration and the transaction-log retention actually in effect for the review period. Reproduction of the query logic on a preserved snapshot where the record allows.
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Report drafting
A written expert report stating what the database recorded, what was audited, what the extract reflects and what the retention record can and cannot support. Every opinion is tied to a specific configuration artifact and a specific archive record.
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Deposition, hearing and trial testimony
Preparation, deposition in person or by remote hookup, hearing or trial testimony bounded by the report, and post-testimony workpaper retention for appellate review.
Evidence commonly examined
Evidence reviewed
- Schema exports, DDL history and migration records
- Audit-trail exports (Oracle Unified Audit, SQL Server SQL Audit, pgaudit, MySQL audit)
- Transaction and archive logs preserved for the review period
- Produced query extracts and the query logic that generated them
- Backup catalogs and restore-tested backup evidence where available
- Opposing database expert reports, workpapers and query notebooks
- Court orders, protective orders and ESI protocols specific to structured data
What you can expect
What you receive
- Expert report on schema, audit, retention and produced extract sufficiency
- Reproducibility appendix with queries executed, versions and any deviations
- FRCP 30(b)(6) preparation memoranda for the retaining party's database designee
- Deposition and trial testimony bounded by the report
- Rebuttal declaration on opposing database expert reports
- Demonstratives sourced to schema exports and audit records already in evidence
Frequently asked
Common questions
Do you serve as an FRCP 30(b)(6) database custodian, or only as an outside expert?
GDF serves as an outside technical expert, not as the party's designated organizational witness. At counsel's direction, the work can also support the designee's preparation on schema, audit, retention and query mechanics.
Can you testify on Oracle, SQL Server and PostgreSQL in a single matter?
A multi-platform scope can cover Oracle, SQL Server and PostgreSQL together. The report states the configuration and retention for each database instance and treats each system on its own facts.
How is a produced query extract examined for sufficiency?
Where the record allows, the query logic that generated the extract is re-executed against a preserved snapshot. The extract and the re-execution are compared row for row for the columns in scope. Where the record does not allow full re-execution, the analysis states what can and cannot be established.
Can you handle a cloud data warehouse matter where time-travel has expired?
Yes. Where time-travel has expired, the analysis relies on preserved snapshots, cross-account share history and provider-side retention records. The report states what is available and what has aged out.
Do you produce rebuttal declarations on opposing database experts?
A rebuttal engagement reviews the opposing report, workpapers and query notebooks, then forms an independent opinion tied to the underlying database configuration and log evidence.
Related capabilities
Related services
Talk with an examiner
Discuss the matter and the next step.
Call to discuss timing, scope and the safest way to share information. Do not send evidence or credentials by email.
24/7 hotline: 1-800-868-8189