In this video will certainly attempt to recognize what precisely is CDC CDC stands for Change Data Capture Often times in tasks we would love to go as well as preserve audit path for a table On the display you recognize I have a simple sales table below I have 2 documents here Shiv and also Raju Someone changes shiv to shiva After that I wish to maintain some kind of audit path table where I can obtain the old values and the brand-new values CDC assists us to capture insert, update and also erase tasks on table information Currently allowing CDC is a 2 step procedure the very first thing is we require to go enable CDC on the data source degree and afterwards we require to go and also define certain tables on which we require to go make it possible for CDC In order to enable CDC In order to allow CDC on the data source degree we need to go and terminate this kept treatment here you can see on the display sp_cdc_enable_db Allow me just go and also terminate this kept procedure Once you discharge the kept procedure you can see that on display it is saying me command has finished successfully that indicates Now CDC has been made it possible for on the data source level Once you have actually allowed CDC it develops number of tables for himself At the left hand side it develops pair of tables in the system tables folder like recorded columns what kind of columns will certainly be caught for old values a brand-new worths which are the tables for which CDC are make it possible for that is change_tables and so on it has actually developed pair of tables I will come to this thing later on additionally it has create number of stored procedures not number of kept treatments many stored procedures actually If you go down below you can see this _ CDC saved procedures below all of these are produced for CDC so once you allow CDC it develops stored procedures and some tables so that it can take care of the CDC functionality correctly Currently we have allow CDC on the databse level We require to enable CDC on the table degree We have the easy table right here called as sales Proceed make it possible for CDC on the sales table To allow CDC on a table degree we require to utilize sp_cdc_enable_table In this kept procedure we need to go as well as pass the table name on which we want the CDC to be make it possible for so you can see here I have actually written right here the sales table and I am the passing the sales table name to this kept procedure If I now perform this stored procedure so there it is carrying out When I most likely to enable CDC on the table level He is claiming that your SQL Web server agent is not running so in order to carry out CDC you need to make certain that the SQL Server agent is running Proceed to our services.msc as well as let’s allow SQL Server representative so I have actually clicked on begin run as well as I have kind services.msc so there my services I have opened.Let’s go on and also consider SQL Server representative there it is You can see that in my computer I have lots of variation of SQL Server installed like SQL Web server 2012 and this is 2008. presently we are servicing 2008. allow me go as well as run this agent I am mosting likely to begin this There my SQL server representative beginning now until that representative starts there at the background allow’s go on and also switch over to the SQL Server management studio We have actually allowed CDC on the table level it will certainly produce one more table This is some table folder below as well as this table name is dbo_sale_CT _ CT tables are those tables which actually catches insert update as well as erase activities for a certain table This table below dbo_sales_CT table will certainly capture all the tasks of insert upgrade and also remove for the sales table Let'' s claim I had a consumer table right here and also if I enable CDC on it a table with name dbo-customers_CT would certainly have been produced below The CT table really records insert, upgrade and delete tasks for a certain table The CDC has been allow on the sales table If I go as well as do some adjustment on the sales table information Modification 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 here Take a look at the last 2 fields Its informing that the old value was Shiv and afterwards later on it was altered to Shiva The sales amount was the same In the exact same means if I go and change Raju to Raja The old worth was Raju as well as the brand-new worth is Raja.In the exact same method if I go and erase Raja I will get one access below claiming that Raja was deleted, this 1 represent delete By using CDC now we can keep track of insert upgrade as well as delete tasks on a table There is one more crucial field in this table here called as the operation field This procedure field actually aids you to track what kind of tasks has actually happened when this transaction happens Was it a insert procedure, was it erase operation was it upgrade procedure just what was a procedure on the data The procedure field has 4 feasible values The very first one is erase so primarily When any kind of type of procedure has a remove activity then it will be noted as 1 Second 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 value and also the 4 indicates that it is a new value 1 for delete 2 for insert and 3 or 4 to markup update activity There are number of even more tables here and most likely these table can be interesting The very first table which is extremely fascinating is captured_columns table This maintain the record of what type of column it is tracking Presently we have actually allowed CDC on the sales table we are tracking the sales person and also the sales amount It has another table here called as a change_tables It track primarily which table has actually been enabled for CDC The most essential table is the _ CT table where he will get the old values and new values with the procedure area saying what sort of tasks was performed on the document Secondly we have the captured_columns table Where we can understand that what sort of columns are allowed for CDC and after that finally we have the change_tables table which reveals on which tables the CDC was enabled I wish that you appreciated this video.In this video we were trying to understand how we can use CDC to track insert, upgrade as well as remove tasks on the table
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