What is the difference between magic table and temporal (system versioned) table in SQL Server?
Magic Table
Virtual and No Physical Existence. SQL Server internally maintain magic table.
There are two table name INSERTED and DELETED.
INSERTED contains information about newly inserted or updated record in table.
DELETED contains information about last state of that table record.
Now if you perform two update operation on two table then INSERTED and DELETED megic table updated accoridignly and atleast available in trigger.
Apart from Trigger you can use with output clause.
Temporal Table
This is new feature of SQL Server 2016.
It is also called server versioned history table for particular table so there is a physical existence of this Temporal table.
You can query against it and also its purpose is to keep history of particular record.
How do I create a trigger in Microsoft SQL server to keep a track of all deleted data of any table existing in the database into a single audit table? I do not want to write trigger for each and every table in the database. There will only be once single audit table which keeps a track of all the deleted data of any table.
For example:
If a data is deleted from a person table, get all the data of that person table and store it in an XML format in an audit table
Please check my solution that I tried to describe at SQL Server Log Tool for Capturing Data Changes
The solution is build on creating trigger on selected tables dynamically to capture data changes (after insert, update, delete) and store those in a general table.
Then a job executes periodically and parses data captured and stored in this general table. After data is parsed it will be easier for humans to understand and see easily which table field is changed and its old and new values
I hope this proposed solution helps you for your own solution,
Is there any type of product where I can write a SQL statement to select from one table and then insert into another database (The other database is out in the cloud). Also, it needs to be able to check to see if that record exists and then update the row if anything has changed. Then it will need to run every 10-30 minutes to check to see what has changed or if new records have been added.
The source database and the ending database have a different schema (if that matters?) I've been looking, but it seams that only products out there are ones that will just copy one table and insert into a table with the same schema.
I am working on a database used by separate applications. One of these applications is updating two fields in a table but I can't work out what one and don't have the source code for all the applications.
I am wondering if it is possible to write a log (to another table or elsewhere) to what the last update statement made against the table in question was. E.g. to record all SQL that has attempted to update the table automatically...
create a trigger before update on this table. Also create a new table. In that trigger store values before and after update in to a newly created table
I am trying to find a highly efficient method of auditing changes to data in a table. Currently I am using a trigger that looks at the INSERTED and DELETED tables to see what rows have changed and inserts these changes into an Audit table.
The problem is this is proving to be very inefficient (obviously!). It's possible that with 3 thousand rows inserted into the database at one time (which wouldn't be unusual) that 215000 rows would have to be inserted in total to audit these rows.
What is a reasonable way to audit all this data without it taking a long time to insert in to the database? It needs to be fast!
Thanks.
A correctly written trigger should be fast enough.
You could also look at Change Data Capture
Auditing in SQL Server 2008
I quite often use AutoAudit:
AutoAudit is a SQL Server (2005, 2008, 2012) Code-Gen utility that creates
Audit Trail Triggers with:
Created, CreatedBy, Modified, ModifiedBy, and RowVersion (incrementing
INT) columns to table
Insert event logged to Audit table
Updates old and new values logged to Audit table Delete logs all
final values to the Audit table
view to reconstruct deleted rows
UDF to reconstruct Row History
Schema Audit Trigger to track schema changes
Re-code-gens triggers when Alter Table changes the table
Update: (Original edit was rejected, but I'm re-adding it):
A major upgrade to version 3.20 was released in November 2013 with these added features:
Handles tables with up to 5 PK columns
Performance improvements up to 90% faster than version 2.00
Improved historical data retrieval UDF
Handles column/table names that need quotename [ ]
Archival process to keep the live Audit tables smaller/faster but retain the older data in archive AutoAudit tables
As others already mentioned - you can use Change Data Capture, Change Tracking, and Audit features in SQL Server, but to keep it simple and use one solution to track all SQL Server activities including these DML operations I suggest trying ApexSQL Comply. You can disable all other, and leave DML auditing option only
It uses a centralized repository for captured information on multiple SQL Server instances and their databases.
It would be best to read this article first, and then decide on using this tool:
http://solutioncenter.apexsql.com/methods-for-auditing-sql-server-data-changes-part-9-the-apexsql-solution/
SQL Server Notifications on insert update delete table change
SqlTableDependency C# componenet provides the low-level implementation to receive database notification creating SQL Server Queue and Service Broker.
Have a look at http://www.sqltabledependency.it/
For any record change, SqlTableDependency's event handler will get a notification containing modified table record values as well as DML - insert, update, delete - change executed on your database table.
You could allow the table to be self auditing by adding additional columns, for example:
For an INSERT - this is a new record and it's existence in the table is the audit itself.
With a DELETE - you can add columns like IsDeleted BIT \ DeletingUserID INT \ DeletingTimestamp DATETIME to your table.
With an UPDATE you add columns like IsLatestVersion BIT \ ParentRecordID INT to track version changes.