SqlBulkSyncExport

.NET global tool that exports SQL Server change tracking deltas (and optional interval full sync) to CSV files in a target folder.

Inspired by SqlBulkSyncFunction, without a target database: source schema drives CSV columns, and sync watermarks live in a YAML state file.

Install

dotnet tool install --global SqlBulkSyncExport

Usage

sqlbulksyncexport sync <config.yml> <state.yml> <outputfolder> [OPTIONS]

Options:

Option	Description
--seed	Force a full snapshot for change-tracking jobs
--include-table <key>	Only export the given table key (repeatable)
--exclude-table <key>	Skip the given table key (repeatable)
--parallelism <n>	Max tables to export concurrently (overrides YAML parallelism)

Authentication

Configure source.connectionString in YAML.

Set source.entraIdAuth: true to authenticate with DefaultAzureCredential (optional source.tenantId or AZURE_TENANT_ID).

Configuration

See samples/config.yml for a fuller example.

Minimal config (table key becomes the default {key}.csv file name):

source:
  connectionString: "Server=localhost;Initial Catalog=SyncTest;Integrated Security=True;TrustServerCertificate=True"
  # entraIdAuth: true          # optional; DefaultAzureCredential
  # tenantId: "00000000-0000-0000-0000-000000000000"  # optional; or AZURE_TENANT_ID

tables:
  dbo_Customers:
    source: dbo.Customers
  dbo_Orders:
    source: dbo.Orders

Optional source fields:

• entraIdAuth — defaults to false; set true for Entra / DefaultAzureCredential
• tenantId — optional tenant for Entra auth (falls back to AZURE_TENANT_ID)

Important defaults:

• includeHeader defaults to true when omitted
• writeDeleted defaults to false (opt-in deleted PK files)
• newLine defaults to CRLF (\r\n)
• parallelism omitted/null = sequential (1); positive integer = max concurrent table exports; CLI --parallelism overrides YAML when set
• progressLogBatchSize omitted/null = auto via COUNT (logs percent + ETA; step size by row count: <1k → 50%, <5k → 25%, <10k → 20%, <25k → 10%, <250k → 5%, <500k → 2%, else 1%); <= 0 disables; positive = fixed row interval (no COUNT/%/ETA)
• targetFile / deletedFile are file names with extension, no path
• Timestamp/version tokens are inserted before the extension, for example:
  • delta: dbo_Customers_20260101120000_0000000010_0000000020.csv
  • full snapshot: dbo_Customers_20260101120000_0000000020_full.csv
  • deleted PKs (when enabled): dbo_Customers.deleted_20260101120000_0000000010_0000000020.csv

Sync state

See samples/state.yml. Missing table entries are treated as never synced (currentVersion: -1) and trigger a full snapshot export.

Do not flip a job between change tracking and fullSync without clearing state for those tables.

Modes

• Change tracking (default): incremental I/U CSV; optional deleted-PK CSV; first run / invalid watermark / --seed writes a full snapshot
• Full sync: when fullSync is present, exports a full table snapshot when the interval elapses (Unix-ms watermark)

Prerequisites

• .NET 10 SDK / runtime
• SQL Server with change tracking enabled on source tables (CT mode)