Sybase Training Courses

• Modify system tables simply inside a transaction. Issue to begin a transaction command before you issue the data alteration command.
  
• Validate only the rows you wanted to change affected by the command and that the data was changed correctly.
  
• If the command was improper, problem a rollback transaction command. If the command was right, issue a commit transaction command.
  
• A database manager can update the system tables in any of the tables that he or she owns it, if that allow to updates in system tables that are enabled.
  

• All Sybase delivered tables in the master database
  
• All tables in operator databases that begin with “sys” and also that holds an ID value in the sysobjects table of lesser than or more equal to 100
  

• The tables that can be shared between Adaptive Server sessions
  
• The tables that is available only by the present Adaptive Server session or Procedure
  

• Constraints are used to explain enforce uniqueness, primary keys and to define foreign key relationships.
  
• Primary Key
  
• Not Null Constraint
  
• Foreign Key (Referential Integrity)
  
• Check Constraint
  
• Unique Key
  
• Default Constraint
  

Chained Mode & Unchained Mode

CHAINED MODE:

Implicitly creates a transaction before any data recovery or modification statement.

These statements that includes: Delete, Open, Insert, Select, Fetch and Update. You must still clearly end the transaction and commit with the transaction or rollback transaction.

UNCHAINED MODE: 

The default mode needs to begin transaction statements combined with commit transaction or rollback transaction statement to finish the entire transaction.

• To equal characteristics of host and client server systems
  
• To recognize features and benefits of the Sybase Client & Server System Architecture
  
• To explain the function of key Sybase tools, components and utilities
  
• To describe that how to Sybase System 11 provide non-Sybase applications