SQL Server real time backup library requirements

SQL Server 2008 After that, the built-in method was provided “ Change data capture ”（Change Data Capture namely CDC） To achieve asynchronous tracking of user table data modification .
One 、 Environmental requirements
1、SQL Server 2008 And above （ For the library ）.
2、SQL Server Active and standby environment requirements ： The standby database and the primary database are synchronized in real time and can be read . Currently supported standby databases There are two options ： Copying model （ Publish subscribe ）、AlwaysOn.
3、SQL Server Standby library is on CDC、 And specify that the table is opened CDC.
4、 Ensure that the standby database is in a continuous connectable state （ We need to access the standby database directly ）, If this condition cannot be met , have to A new standby database server must be provided .
Two 、 Backup library on CDC Operation steps
1、 Make sure sql server Built in CDC The function is on You can query through the following command CDC state SELECT name,is_cdc_enabled FROM sys.databases WHERE name = ‘dbname’ Opening method
EXECUTE sys.sp_cdc_enable_db; Copying model （ Publish subscribe ） This operation should be performed on the standby database ,AlwaysOn In mode , Because the standby database is read-only , So you need to perform operations in the main database .
2、 Need to start SQL SERVER Agent（SQL Server Agency service ）
3、 Account creation You need to create an account for cdc For extraction service , The account has the following conditions ：  SQL Server Of sysadmin Fixed server role members .  Database db_owner.
4、 Turn on the watch CDC -- Parameters @
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