snowflake-data-validation 1.20.2

Snowflake Data Validation

Snowflake Data Validation

Snowflake Data Validation is a command-line tool and Python library for validating data migrations and ensuring data quality between source and target databases, with support for SQL Server, Redshift, Teradata, and Oracle as source systems.

📖 For detailed usage instructions, configuration examples, and CLI reference, see the official documentation.

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🚀 Features

• Multi-level validation: Schema validation, statistical metrics, and row-level data integrity checks.
• Multiple source platforms: SQL Server, Redshift, Teradata, Oracle.
• User-friendly CLI: Comprehensive commands for automation and orchestration.
• Parallel processing: Multi-threaded table validation for faster execution.
• Offline validation: Extract source data as Parquet files for validation without source access.
• Flexible configuration: YAML-based workflows with per-table customization.
• Partitioning support: Row and column partitioning helpers for large table validation.
• Detailed reporting: CSV reports, console output, and comprehensive logging.
• Extensible architecture: Ready for additional database engines.

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📦 Installation

pip install snowflake-data-validation

For SQL Server support:

pip install "snowflake-data-validation[sqlserver]"

For development and testing:

pip install "snowflake-data-validation[all]"

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🔄 Execution Modes

Mode	Command	Description
Sync Validation	run-validation	Real-time comparison between source and target databases
Source Extraction	source-validate	Extract source data to Parquet files for offline validation
Async Validation	run-async-validation	Validate using pre-extracted Parquet files
Script Generation	generate-validation-scripts	Generate SQL scripts for manual execution

Supported Dialects: sqlserver, snowflake, redshift, teradata, oracle

CLI entry point: from the repo (or an install), run the package module — for example:

python -m snowflake.snowflake_data_validation redshift run-validation -dvf path/to/config.yaml

Do not use python -m snowflake.snowflake_data_validation.main_cli for subcommands; that path exits after logging without dispatching to redshift / sqlserver / etc.

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🔍 Validation Levels

Validation runs L1 schema, L2 metrics, and optionally L3 row (and cell / hybrid modes where configured). Each level emits per-column (or per-criterion) rows with a STATUS of SUCCESS or FAILURE; the run is considered passing at that level only when no failure rows are present.

Schema Validation

Compares table structure between source and target:

• Column names and order
• Data types with mapping support
• Precision, scale, and length
• Nullable constraints

Metrics Validation

Compares statistical metrics for each column:

• Row count
• Min/Max values
• Sum and Average
• Null count
• Distinct count

Views

For Redshift and Teradata sources, views are validated on the view itself (no CREATE TABLE AS SELECT materialization in local sync mode). Other platforms may still materialize views to temporary tables before L1/L2/L3. Teradata views use basic schema comparison (existence + datatype) in the sync executor; Redshift uses full schema metadata like tables.

Row Validation

Performs row-by-row comparison:

• Primary key matching
• Field-level value comparison
• Mismatch reporting

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📊 Reports

• Console Output: Real-time progress with success/failure indicators
• CSV Reports: Detailed validation results with all comparison data
• Log Files: Comprehensive debug and error logging

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CLI commands

snowflake-data-validation <source_dialect> <command> [options]
# Short alias: sdv <source_dialect> <command> [options]

Supported dialects include sqlserver, teradata, redshift, and oracle. Common commands: run-validation, run-async-validation, source-validate, and generate-validation-scripts. The dialect must match source_platform in your configuration file.

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📚 Documentation

For complete command reference, configuration options, and examples, see the Data Validation CLI.

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Changelog

v1.20.2

New features

• Added ODBC data migration support for Azure Synapse serverless SQL pool.

Improvements

• Improved L3 row validation with a safeguard for mismatched target columns.

Bug fixes

• Fixed identifier quoting: uppercase identifiers remain unquoted while lowercase or mixed-case identifiers are auto-quoted.

v1.20.1

New features

• Added ODBC-based data migration support for Azure Synapse Analytics (Dedicated SQL pool), including object-type catalog queries.

Bug fixes

• Fixed datatype normalization templates that caused incorrect row index handling during cell-by-cell validation.

v1.20.0

New features

• Added doctor subcommand for the data exchange agent to support scai data doctor.
• Added doctor subcommand for the data migration orchestrator to support scai data doctor.
• Added support for Oracle quoted and mixed-case identifiers in catalog and object-type queries.

Improvements

• Improved L3 row validation by skipping per-partition information_schema queries.

Bug fixes

• Fixed PostgreSQL special datatype extraction and loading in Snowflake.

v1.9.2

Bug fixes

• Fixed L3 row hashing crash when source and target tables had different column counts under existing column-selection or column-mapping config.

v1.9.1

Bug fixes

• Fixed smart partition size calculation when using targetWhereClause.

v1.9.0

New features

• Added Azure Synapse connection support (Phase 1).
• Added Azure Synapse L1 schema validation (Phase 2).
• Added Azure Synapse L2 metric validation (Phase 3).
• Added Azure Synapse L3 row validation (Phase 4).
• Added Azure Synapse CLI and agent integration (Phase 5).
• Added PostgreSQL bulk extract via psql \copy with PG_CSV_FILE_FORMAT support.
• Added Oracle ROWID and UROWID type support.
• Replaced standalone Oracle connector with oracledb-backed agent connection and added an Oracle Docker image.

Improvements

• Enhanced task telemetry by integrating MigrationTracker and current-step tracking.
• Improved Oracle fully-qualified-name and view validation handling.
• Updated VARCHAR limits in validation templates and constants.
• Improved row-hashing performance.

Bug fixes

• Fixed result-set normalization rules to handle whitespace correctly.
• Fixed custom-template model imports.

v1.8.0

Breaking changes

• DuplicateIndexKeysError has been removed. Cell-by-cell validation no longer raises on duplicate index keys; instead, duplicate-key rows are silently excluded and reported as DuplicateKeyInfo entries.
• validate_cell now returns tuple[ValidationResult, list[DuplicateKeyInfo]] instead of ValidationResult.
• CellDataValidator.validate_cell_comparison now returns tuple[pd.DataFrame, list[DuplicateKeyInfo]] instead of pd.DataFrame.
• compare_md5_rows uses group-by merge: keys appearing more than once on either side emit DUPLICATE_SOURCE/DUPLICATE_TARGET/DUPLICATE_BOTH_SIDES for every row in the group; FAILURE is never emitted for keys with duplicates.
• Added support for early stopping, hybrid L3, and Snowpipe; existing configurations may need to be updated.

New features

• Added view validation support to the Cloud Data Validation pipeline.
• Added DATA_MIGRATION_WORKFLOW and DATA_VALIDATION_WORKFLOW views with workflow-type filtering and per-workflow L1/L2/L3 progress rollups.
• Added Oracle ODBC source support.
• Added Teradata type mappings and Snowflake target fully-qualified-name helpers.
• Added Teradata object_type query in the shared dispatcher.
• Added Teradata to the data-migration-orchestrator workflow.
• Added Oracle source platform with ALL_ schema discovery, type mappings, and preprocessing hooks.
• Added early-stopping support for L3 row-hashing validation.
• Added support for custom metrics and templates in Cloud Data Validation.
• Added Oracle Data Validation foundation with L1 schema validation.
• Added L2 metrics validation for Oracle.
• Added L3 row and cell MD5 validation for Oracle.
• Added Oracle wiring and factory registration in the SDV core.
• Added the teradata optional install extra (pip install snowflake-data-exchange-agent[teradata]).
• Added PostgreSQL data types and normalization rules.
• Added Snowflake schema utilities and type-mapping updates for the orchestrator.
• Added a metrics skill and PostgreSQL metrics templates.
• Added PostgreSQL connector with L0 and L1 validation.
• Added Redshift view validation.
• Added Oracle as a supported Data Validation source across the orchestrator and agent.
• Added L2 and L3 row and cell validation for PostgreSQL.
• Added PostgreSQL support to Cloud Data Validation.

Improvements

• Optimized L3 row-hashing queries.
• Updated Teradata MD5 queries.
• Extended Teradata ODBC connection configuration.

Bug fixes

• Fixed DV CLI not exiting on Ctrl+C by installing SIGINT/SIGTERM handlers.
• Fixed is_valid semantics so it indicates whether validations were executed rather than success or failure.
• Prevented out-of-memory errors in cell-by-cell and row-hashing comparisons in workers.
• Fixed L3 row-hashing producing false positives.
• Prevented unnecessary shared-cache eviction when the loaded copy already matches the workspace.

v1.7.1

Improvements

• Improved column metrics query performance by consolidating per-column CTEs into a single wide-row query; wide-table runs on a 24 GB test dropped from about 52 minutes to about 21 minutes.

Bug fixes

• Fixed Value overflow in a SUM aggregate errors on STDDEV over 64-bit integer columns by casting SUM/AVG/STDDEV inputs to FLOAT on Snowflake, Teradata, and SQL Server; removed the VARIANCE metric from all dialects.

v1.7.0

Improvements

• Cast value columns to Utf8 before unpivot and corrected IS_VALID evaluation.
• Vertical partitioning for cell validation on wide tables.
• Validated table-level ROW_COUNT during schema validation.
• Table-centric Streamlit dashboards with CSV export.

Bug fixes

• Fixed timestamp copy handling for SQL Server BCP loads.
• Fixed Teradata row validation when chunk MD5 comparison was skipped incorrectly.
• Fixed duplicate tasks created when evaluating L1 results under race conditions.
• Fixed decimal partition coercion and parallelized L3 validation fixes.

v1.6.0

New features

• Added hybrid row validation mode — two-phase MD5 + cell drilldown.
• Added support for smart partitioning in Cloud Data Validation.
• Added DEFAULT metrics templates and fallback logic for empty metrics templates.
• Added DEFAULT normalization templates for various data types.

Improvements

• Improved result set snapshots validation.
• Added customization options for result set snapshot generation.
• Improved Data Validation performance.
• Improved the task queue to support a higher number of parallel workers.

Bug fixes

• Fixed SQL compilation memory exhaustion by batching L2 metrics queries for wide tables.
• Fixed cell validation key mismatch, partition WHERE clause handling, and metrics payload cleanup.
• Fixed duplicate rows caused by an orchestrator crash during COPY INTO.
• Fixed an issue with the incremental sync watermark on Redshift.
• Fixed usage of the vectorized scanner.

v1.5.2

Bug fixes

• Redshift: close cursors correctly after connection verification.
• Teradata: safer row-count and metadata/metrics SQL (large COUNT(*) values; WHERE clauses applied as intended).

v1.5.1

Improvements

• Cell validation streams rows in chunks for very large result sets when cloud validation runs on the worker.

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📄 License

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