For example, the dbo_Employee_CT table will capture all the Insert, Update, and Delete activity performed on the Employee table. Note: _CT tables are those tables that actually capturers the Insert, Update, and Delete activity for a particular table. Once the SQL Server Agent is enabled now go to the System Tables folder and you will find one more table i.e. Once you click on the Yes button, the SQL Server Agent service is run. Simply, click on the Yes button as shown below. Once you click on the Start option, it will prompt you to one window asking whether you want to start the SQL Server Agent or not. In order to enable SQL Server Agent, go to object explorer in SSMS, and then right-click on the SQL Server Agent and click on the Start option from the context menu as shown below. So, please read that article to know SQL Server Agent in detail. We have discussed SQL Server Agent in detail in our Job Scheduling article. How to Start the SQL Server Agent Service? If SQL Server Agent is not enabled, then you will get the following message when you execute the above stored procedure. In order to make the CDC work, the SQL Server Agent service should be in the run. Here, we are providing the schema, table name, and roll to the stored procedure. In order to enable CDC at Table level, we need to execute the system stored procedure sp_cdc_enable_table as shown below. So, let us enable CDC on this Employee table. We created the Employee table on the TestDB database. Once we enable the CDC at the database (TestDB) level, the next step is to enable the CDC at the table (Employee) level. Note: These stored procedures and tables are basically used to manage the CDC functionality properly. Along with these tables, it also creates a large number of stored procedures which you can find in the System Stored Procedures folder as shown below. What all these tables are that we will discuss later part of this article. Once the CDC is enabled, it creates a couple of tables by itself in the System Tables folder as shown below. Once you execute the above-stored procedure, in the message window you will get the message as Commands completed successfully which means now CDC is enabled at the database level. In order to enable CDC on the database level, you need to execute the following system stored procedure. Step2: Then we need to define specific tables in which we need to enable CDC. Step1: First we need to enable CDC on the Database Level How to use CDC in SQL Server?Įnabling CDC in SQL Server is a two-step process. Note: CDC helps us to keep track of Insert, Update, and Delete activity on table data. If we would like to maintain some kind of audit drill table where we want to keep both the old values as well as new values then we need to use Change Data Capture (CDC) in SQL Server. Let say, when someone changes the Employee information (for example change name from David to Smith whose employee id is 2). INSERT INTO Employee VALUES (3, 'Sara', 100000)Īs you can see, we have inserted three records into the Employee table. INSERT INTO Employee VALUES (2, 'David', 100000) INSERT INTO Employee VALUES (1, 'James', 100000) Once you create the above database and table, let us now insert some data into the Employee table by executing the below Insert SQL Statements. First, create a database ( TestDB) and a table ( Employee) by executing the following SQL Scripts. Let us understand what it means with an example. Many times in projects, you may like to maintain audit drills for important tables. How to identify which row is used for what type of operations (Insert, Delete, or Update)? Why we need Change Data Capture (CDC) in SQL Server?. How to Start the SQL Server Agent Service?.Why we need Change Data Capture (CDC) in SQL Server?.At the end of this article, you will understand the following pointers in detail which are related to CDC in SQL Server. Please read our previous article where we discussed How SQL Server Store and Manages Data Internally in detail. In this article, I am going to discuss what exactly Change Data Capture (CDC) in SQL Server is and its need. Data Structures and Algorithms Tutorialsīack to: SQL Server Tutorial For Beginners and Professionals Change Data Capture (CDC) in SQL Server.
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