Hidden Oracle NT Environment variables

In the v$parameter view, the name of the redo log file is defined as

    log_archive_format %%ORACLE_SID%%%S.%T . Oracle_sid is obvious, and can be found in the registry, but what are %S% and %T% supposed to represent, and where are they defined? They appear to be a unique sequence number and the redo thread. Anyways, my curiosity is getting the best of me. Received on Thu Jan 28 1999 - 14:43:44 CST