-- CDC
-- Step 1: Check SQL Server Agent  
-- Step 2:Enable CDC at Database Level

Query - EXEC sys.sp_cdc_enable_db;

--Verify CDC enabled for database

SELECT name,is_cdc_enabled
FROM sys.databases
WHERE name = 'YourDatabaseName';

--if is_cdc_enabled = 1, CDC is enabled.

--Step 3: Enable CDC for a Table

EXEC sys.sp_cdc_enable_table
    @source_schema = 'dbo',
    @source_name   = 'Employee',
    @role_name     = NULL;

-- Step 4: Verify CDC Enabled for Table
SELECT name,is_tracked_by_cdc
FROM sys.tables
WHERE name = 'Employee';

--Step 5: Check CDC Tables

SELECT *
FROM cdc.change_tables;
--You may see: 'cdc.dbo_Employee_CT'

-- Step 6: Test CDC
Insert,Update,Delete

--Step 7: Read CDC Data
SELECT * FROM cdc.dbo_Employee_CT;

Step 8: Disable CDC (Optional)

EXEC sys.sp_cdc_disable_table
    @source_schema = 'dbo',
    @source_name   = 'Employee',
    @capture_instance = 'dbo_Employee';

-- Disable database CDC
EXEC sys.sp_cdc_disable_db;

-- Important Notes
CDC is available in:
SQL Server Enterprise
Standard Edition (SQL Server 2016 SP1 and later)
Table must have a:
Primary Key (recommended)
Or unique index
SQL Server Agent must remain running

Architecture Overview
Table Changes
      ↓
Transaction Log
      ↓
CDC Capture Job
      ↓
cdc.<table>_CT Table
      ↓
Query CDC Data