In this video will try to comprehend what specifically is CDC CDC represents Adjustment Information Capture Lots of times in tasks we want to go and preserve audit route for a table On the display you know I have an easy sales table here I have 2 documents here Shiv and also Raju Somebody modifications shiv to shiva Then I would certainly like to preserve some type of audit path table where I can get the old values and the new values CDC assists us to capture insert, upgrade and also erase tasks on table information Now enabling CDC is a two step procedure the initial thing is we require to go enable CDC on the database degree and after that we need to go as well as specify certain tables on which we need to go make it possible for CDC In order to make it possible for CDC In order to make it possible for CDC on the database degree we require to go and also terminate this saved procedure here you can see on the display sp_cdc_enable_db Let me simply go as well as discharge this saved procedure Once you terminate the saved procedure you can see that on screen it is saying me command has actually completed effectively that suggests Now CDC has actually been made it possible for on the database level Once you have actually enabled CDC it develops couple of tables for himself At the left hand side it develops couple of tables in the system tables folder like captured columns what kind of columns will be captured for old worths a brand-new worths which are the tables for which CDC are allow that is change_tables and so on it has created number of tables I will pertain to this thing later additionally it has produce pair of stored treatments not number of kept treatments many stored treatments really If you go down below you can see this _ CDC kept treatments here all of these are produced for CDC so when you allow CDC it creates stored procedures and also some tables so that it can handle the CDC capability properly Now we have enable CDC on the databse level We need to allow CDC on the table level We have the basic table right here called as sales Go on allow CDC on the sales table To allow CDC on a table degree we need to make use of sp_cdc_enable_table In this stored procedure we need to go and pass the table name on which we want the CDC to be allow so you can see right here I have composed here the sales table and I am the passing the sales table name to this saved procedure If I currently implement this saved treatment so there it is carrying out When I go to allow CDC on the table level He is saying that your SQL Web server agent is not running so in order to apply CDC you require to ensure that the SQL Server agent is running Go on to our services.msc and allow’s allow SQL Server agent so I have clicked beginning run and also I have kind services.msc so there my services I have opened.Let’s go on and consider SQL Web server representative there it is You can see that in my computer I have great deals of variation of SQL Server set up like SQL Web server 2012 as well as this is 2008. presently we are working on 2008. allow me go and run this representative I am mosting likely to start this There my SQL server representative starting currently up until that representative starts there at the background let’s go on and switch to the SQL Server management workshop We have actually allowed CDC on the table level it will certainly create another table This is some table folder here and also this table name is dbo_sale_CT _ CT tables are those tables which really captures insert update as well as delete tasks for a specific table This table right here dbo_sales_CT table will certainly record all the tasks of insert update as well as remove for the sales table Let'' s claim I had a consumer table here as well as if I allow CDC on it a table with name dbo-customers_CT would certainly have been produced here The CT table really catches insert, update and also delete activities for a particular table The CDC has actually been enable on the sales table If I go and do some alteration on the sales table data Adjustment this Shiv to Shiva I am going to alter that to Shiva currently if I go as well as open my dbo_sales _ CT table In this table there are great deals of areas below Look at the last 2 fields Its telling that the old worth was Shiv and then later on it was transformed to Shiva The sales amount was unmodified In the exact same means if I go as well as transform Raju to Raja The old value was Raju as well as the new worth is Raja.In similarly if I go and remove Raja I will certainly get one entrance below claiming that Raja was deleted, this 1 represent delete By utilizing CDC currently we can check insert upgrade as well as delete activities on a table There is one more important field in this table below called as the procedure field This operation field in fact aids you to track what sort of tasks has actually occurred when this purchase takes place Was it a insert operation, was it erase operation was it upgrade operation what exactly was a procedure on the data The procedure area has four possible values The initial one is erase so primarily When any kind of type of procedure has an erase activity after that it will be noted as 1 2nd one is insert which is noted as 2 In situation it is upgrade it is marked by 3 as well as 4 respectively, 3 suggests that it’s a old worth and also the 4 indicates that it is a new value 1 for remove 2 for insert as well as 3 or 4 to markup upgrade task There are number of even more tables below as well as most likely these table can be interesting The first table which is very interesting is captured_columns table This keep the record of what type of column it is tracking Currently we have allowed CDC on the sales table we are tracking the salesperson and the sales amount It has one more table below called as a change_tables It track essentially which table has actually been enabled for CDC The most essential table is the _ CT table where he will certainly obtain the old worths and also new values with the operation field stating what kind of activities was carried out on the record Secondly we have the captured_columns table Where we can know that what sort of columns are enabled for CDC and after that ultimately we have the change_tables table which reveals on which tables the CDC was allowed I hope that you appreciated this video.In this video clip we were trying to understand just how we can make use of CDC to track insert, update and also delete activities on the table
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