BISQL # 26: Audit Trail Part : II- Implementation of Auto Auditing with Pros and Cons
Hi Friends,
This Article for implementing auto auditing will Covers Following points:
- Need of Audit trailing
- Implementation of Audit trailing
- Code Specification
- Pros of Audit trailing System
- Cons Of Audit trailing system
- Reference Used For Article
Need of Audit trailing:
When we are performing any modification on the database and we need to track all the changes in the for Database at every level we will implement Audit trailing
As per capitation requirement Auditing is most important aspect to track change details and easy to maintenance
Implementation of Audit trailing
1.Database Table Implementation
· Only one table which is going to track every change in configurable Audit table
Audit table specification
Explanation of fields
- AuditID: Unique Audit Identification number
- Type:I,U,D(I-Insert,U-Update,D-Delete)
- TableName:On which table changes is occurred
- PK: Primary Key for Audit Table
- FieldName:On which filed Changes is occurred
- OldValue: Old value of given field
- NewValue: New value of given field
- UpdateDate:When Change Occurred
- UserName: DB User Name for Change
2. Database Stored Proc Implementation
We have Following Stored Proc Which will implement auditing for required Table
Stored Proc Name: CreateAudit
Parameters to Stored Proc and its use
1.@TableName: Name of the table to be auditing is required
2.@AuditType: We have 3 Types of auditing (Insert, Update, and Delete) i.e. value (I, U & D)
Code Specification
Code Snippet:
One can have all the Script here :http://sqlblog.com/blogs/paul_nielsen/archive/2007/01/15/codegen-to-create-fixed-audit-trail-triggers.aspx , http://autoaudit.codeplex.com/
Pros of this System
- Easy for maintenance
- Easy to implement and reuse
- User can Set Audit for Specific table
- Do Not consider auditing Staging table
Cons of this system
- One Simple Daily batch Job For Archival of history of audit table only
- Table Growth is Unstoppable during bulk insertion
- May affect performance of System as we are using triggers for each insert ,update and delete
Reference Used For Development
1. Shadow table Auditing : http://www.c-sharpcorner.com/uploadfile/etechmentor/607/
2. prototype pattern Auditing : http://www.dotnetfunda.com/articles/article336-implementing-audit-trail-using-trigger.aspx
3. Output Clause : http://www.sqlhub.com/2011/07/audit-trail-with-output-clause-in-sql.html
4. By MSDN : http://technet.microsoft.com/en-us/library/dd392015(SQL.100).aspx
5. @ DBA level Auditing: http://www.sqlservercentral.com/articles/Auditing/63247/
6. Auto Audit : http://sqlblog.com/blogs/paul_nielsen/archive/2007/01/15/codegen-to-create-fixed-audit-trail-triggers.aspx , http://autoaudit.codeplex.com/,
For more interesting information on SQL we can also look into similar topics such as
· BISQL # 27 : Audit Trail Part : III-Implementation of Audit Trailing with CDC
· BISQL # 28: Audit Trail Part : IV–Comparing Entity Framework and SQL CDC
· BISQL # 29 : Analysis and Documentation Query
· BISQL # 30 : How Should I Find Information about Data Type
· BISQL # 31 : How To Create Folder from SSMS
Hope you will like this post on Audit Trail Part II.
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