REVERT

The REVERT command drops all changes made to the specified objects since they were last updated, resynchronized (using a RESYNC statement), or acquired using ACQUIRE the RESYNC phrase, or since the analytic workspace was attached.

Syntax

REVERT objects

Arguments

objects: A list of the names, separated by commas, of acquired variables, valuesets, relations, or dimensions in an analytic workspace attached in multiwriter mode or a list of variables, valuesets, relations, or dimensions in an analytic workspace attached in read-only mode.

Notes

Reverting a Dimension After Adding Dimension Values

Reverting a dimension after adding dimension values is not recommended since it can result in suboptimal space allocation for variables dimensioned by the dimension.

Examples

Example 21-5 Using REVERT to Undo Modifications

Assume that you have a variable named budget in an analytic workspace named myworkspace. Assume, also, that you need to modify budget in several steps but do not want to update the analytic workspace data until all steps are completed. For each step, you want to run several models to find the one that produces desired results. To perform this task, take the following steps:

Attach the analytic workspace in multiwriter mode.
Acquire budget.
For each step:
1. Run the appropriate models, performing revert operations between them until you finds the desired model
2. Update budget.
Commit and release budget.

The following code accomplishes these tasks.

AW ATTACH myworkspace MULTI
ACQUIRE RESYNC budget
...try model 1a --> not acceptable
REVERT budget
...try model 1b --> ok. Done with Step 1
UPDATE MULTI budget
...try model 2a --> not acceptable
REVERT budget
...try model 2b --> not acceptable
REVERT budget
...try model 2c --> ok. Done with Step 2
UPDATE MULTI budget
...try model 3a --> ok. Done with Step 3. Done with all steps.
UPDATE MULTI budget
COMMIT
RELEASE budget
AW DETACH myworkspace