In this video clip will try to recognize exactly what is CDC CDC means Modification Data Capture Lot of times in jobs we would love to go and maintain audit trail for a table On the display you understand I have a basic sales table below I have 2 records here Shiv and also Raju Somebody changes shiv to shiva Then I want to maintain some kind of audit route table where I can get the old worths as well as the new values CDC assists us to record insert, update as well as erase activities on table information Currently making it possible for CDC is a 2 action procedure the very first point is we need to go enable CDC on the database level and after that we need to go and specify certain tables on which we require to go make it possible for CDC In order to enable CDC In order to enable CDC on the database level we need to go and also terminate this saved treatment here you can see on the display sp_cdc_enable_db Let me simply go as well as terminate this saved procedure Once you fire the stored treatment you can see that on screen it is saying me command has actually completed efficiently that indicates Currently CDC has actually been allowed on the database degree Once you have allowed CDC it creates pair of tables for himself At the left hand side it produces number of tables in the system tables folder like caught columns what kind of columns will be caught for old worths a new worths which are the tables for which CDC are enable that is change_tables etc it has developed pair of tables I will certainly concern this thing later likewise it has produce number of stored treatments not number of stored procedures lots of stored treatments actually If you drop below you can see this _ CDC stored procedures right here every one of these are created for CDC so once you allow CDC it develops kept treatments as well as some tables to ensure that it can manage the CDC performance appropriately Now we have enable CDC on the databse degree We require to allow CDC on the table level We have the basic table right here called as sales Go in advance make it possible for CDC on the sales table To enable CDC on a table degree we need to use sp_cdc_enable_table In this saved procedure we require to go and also pass the table name on which we want the CDC to be allow so you can see here I have composed here the sales table as well as I am the passing the sales table name to this kept procedure If I currently execute this stored procedure so there it is carrying out When I go to make it possible for CDC on the table degree He is stating that your SQL Server agent is not running so in order to apply CDC you require to make sure that the SQL Server agent is running Go on to our services.msc and also let’s enable SQL Web server representative so I have clicked beginning run and I have type services.msc so there my services I have opened.Let’s go on and look right into SQL Web server representative there it is You can see that in my PC I have great deals of version of SQL Web server set up like SQL Server 2012 as well as this is 2008. presently we are working with 2008. allow me go as well as run this agent I am mosting likely to start this There my SQL web server agent beginning now up until that representative starts there at the background allow’s proceed as well as switch over to the SQL Server administration studio We have made it possible for CDC on the table level it will certainly create one more table This is some table folder here and also this table name is dbo_sale_CT _ CT tables are those tables which in fact captures insert upgrade as well as erase tasks for a specific table This table right here dbo_sales_CT table will certainly catch all the tasks of insert update as well as delete for the sales table Let'' s say I had a customer table right here as well as if I allow CDC on it a table with name dbo-customers_CT would certainly have been developed below The CT table in fact catches insert, update and also remove tasks for a specific table The CDC has been allow on the sales table If I go and also do some modification on the sales table data Modification this Shiv to Shiva I am going to alter that to Shiva currently if I go and also open my dbo_sales _ CT table In this table there are whole lots of areas below Take a look at the last 2 areas Its informing that the old value was Shiv and afterwards later on it was changed to Shiva The sales quantity was the same In the very same way if I go as well as transform Raju to Raja The old value was Raju as well as the new value is Raja.In the very same way if I go and also delete Raja I will certainly get one access right here stating that Raja was deleted, this 1 stands for delete By utilizing CDC now we can check insert update as well as remove activities on a table There is one even more important area in this table below called as the operation area This procedure area in fact aids you to track what sort of activities has occurred when this purchase happens Was it a insert procedure, was it erase procedure was it update procedure exactly what was an operation on the data The procedure field has four possible values The first one is remove so essentially When any type of sort of operation has a delete task after that it will be noted as 1 Second one is insert which is marked as 2 In situation it is update it is noted by 3 and 4 respectively, 3 suggests that it’s a old worth and the 4 shows that it is a brand-new value 1 for erase 2 for insert and 3 or 4 to markup update task There are pair of even more tables below and most likely these table can be intriguing The first table which is really interesting is captured_columns table This keep the document of what sort of column it is tracking Currently we have actually enabled CDC on the sales table we are tracking the salesperson and the sales amount It has another table below called as a change_tables It track generally which table has actually been allowed for CDC The most essential table is the _ CT table where he will get the old worths as well as brand-new values with the procedure area saying what type of activities was performed on the document Secondly we have the captured_columns table Where we can understand that what type of columns are enabled for CDC and afterwards lastly we have the change_tables table which shows on which tables the CDC was allowed I hope that you enjoyed this video.In this video clip we were trying to understand just how we can use CDC to track insert, update and also erase tasks on the table
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