Release 10.1A: OpenEdge Deployment:
Managing 4GL Applications

> ## Time stamp validation

> For each table, OpenEdge maintains a time stamp indicating when the schema was last changed. When compiling a procedure, OpenEdge inserts the time stamp into the r-code for each database table accessed by the procedure. This time stamp is the value of the `_Last-change` field in the metaschema `_File` record for each table. Note that sequence changes have no effect on time stamp validation.

> ##### R-code execution with time stamps

> When executing a procedure using time stamp validation, OpenEdge checks to make sure that the time stamps for all accessed tables match those contained in the r-code. If a time stamp does not match, the procedure does not execute.

> To use time stamp validation, compile the procedure with each database connected using the Time Stamp (`-tstamp`) connection parameter. Otherwise, OpenEdge uses CRC validation.

> Note: The Time Stamp (`-tstamp`) parameter is supported for backward compatibility only.

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