CDC — Complete Guide
CDC — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of SQL Server Tutorial on Toolliyo Academy.
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SQL Server Tutorial · Lesson 67 of 100
CDC
SQL basics ✓ → Queries ✓ → Advanced
Advanced · 3 — Procedures · ~10 min · SQL — Advanced SQL Server
What is this?
Change Data Capture records inserts/updates/deletes to change tables so ETL can read what changed without writing custom triggers.
Why should you care?
Warehouses need incremental loads from DataVerse OLTP with low impact.
See it live — copy this example
Run in SQL Server Management Studio (SSMS) or Azure Data Studio.
USE DataVerse;
-- Enable (requires sysadmin); simplify for learning
EXEC sys.sp_cdc_enable_db;
EXEC sys.sp_cdc_enable_table
@source_schema = N'dbo',
@source_name = N'Orders',
@role_name = NULL;
SELECT capture_instance FROM cdc.change_tables;What happened?
- sp_cdc_enable_db turns on CDC for the database; enable_table tracks Orders.
- change_tables lists capture instances you can read from cdc.* functions.
Practice next
- Enable CDC on your database in lab (non-prod).
- Enable on Orders.
- INSERT/UPDATE a row and query the CDC functions.
- Read cdc.fn_cdc_get_all_changes_… for Orders.
- Disable table capture when the experiment ends.
Remember
CDC captures row changes for ETL. Enable per database then per table. Consume via cdc functions.
Warehouse incremental load
Nightly job reads CDC from DataVerse Orders.
Outcome: Fact tables update without full table copies.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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