There are two classes of variables:

1. Repository variables
2. Session variables

Repository variables: 

A repository variable has a single value at any point in TIME. There are two types of repository variables:

Static: This value persists, and does not change until a Siebel Analytics Server administrator decides to change it.

Dynamic: The values are refreshed by data returned from queries. When defining a dynamic repository variable, you will create an initialization BLOCK or use a preexisting one that contains a SQL query. You will also set up a SCHEDULE that the Siebel Analytics Server will follow to execute the query and PERIODICALLY refresh the value of the variable.

Session Variables:

Session variables are created and ASSIGNED a value when each user logs on.

There are two types of session variables:

1. system
2. non-system.

There are two classes of variables:

Repository variables: 

A repository variable has a single value at any point in time. There are two types of repository variables:

Static: This value persists, and does not change until a Siebel Analytics Server administrator decides to change it.

Dynamic: The values are refreshed by data returned from queries. When defining a dynamic repository variable, you will create an initialization block or use a preexisting one that contains a SQL query. You will also set up a schedule that the Siebel Analytics Server will follow to execute the query and periodically refresh the value of the variable.

Session Variables:

Session variables are created and assigned a value when each user logs on.

There are two types of session variables: