Change Data Capture
时间: 2024-05-23 16:13:35 浏览: 15
Change Data Capture (CDC) is a technique used in databases to capture and track changes made to data in real-time. It involves identifying changes made to data in a database and then recording those changes in a separate system or log. This allows applications to access the most up-to-date data without having to query the entire database for changes. CDC can be used for a variety of purposes such as auditing, replication, and data warehousing. It is often used in conjunction with other technologies such as ETL (Extract, Transform, Load) and data integration tools.
相关问题
change data capture
Change data capture (CDC) is a technique used in databases to capture and track changes made to data in real-time. CDC is used to identify and record changes to data in a database, including insertions, updates, and deletions. This information can then be used to keep other systems and applications synchronized with the changes made in the database. CDC is especially useful in cases where multiple systems need to access the same data, as it ensures that all systems are working with the most up-to-date data. CDC can be implemented in various ways, including using triggers, log-based replication, and other techniques.
sqlserver cdc中change_tables表的字段详情
SQL Server CDC(Change Data Capture)是一种跟踪数据库表中数据变化的功能。当启用CDC功能后,SQL Server将跟踪指定表的更改,并将这些更改记录到系统表中。其中,change_tables表是CDC功能的系统表之一,它记录了CDC功能跟踪的表的详细信息。
change_tables表包含以下列:
- capture_instance:CDC捕获实例的名称。
- object_id:被跟踪表的对象ID。
- source_object_id:被跟踪表的源对象ID。
- capture_instance_id:CDC捕获实例的ID。
- start_lsn:跟踪开始时的LSN(日志序列号)。
- end_lsn:跟踪结束时的LSN(日志序列号)。
- supports_net_changes:表示是否支持净变更捕获的标志。如果支持,则该值为1,否则为0。
- has_column_tracking:表示是否启用列跟踪的标志。如果启用,则该值为1,否则为0。
- is_sys_table:表示是否是系统表的标志。如果是,则该值为1,否则为0。
- is_user_table:表示是否是用户表的标志。如果是,则该值为1,否则为0。
除了change_tables表之外,CDC功能还有另外几个系统表,例如:cdc_jobs、cdc_change_tables、cdc_columns、cdc_indexes等等。这些表可以帮助你更好地了解CDC功能的工作原理,并帮助你更好地利用CDC功能来跟踪数据库表的更改。
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