What Is the Transaction Log (TLOG)?


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The transaction log (TLOG) keeps track of global transactions during the commit phase. At the end of the first phase of a 2-phase commit protocol, the participants in a global transaction issue a reply to the question of whether to commit or roll back the transaction. This reply is recorded in the TLOG.

The TLOG file is used only by the Transaction Manager Server (TMS) that coordinates global transactions. It is not read by the administrator. The location and size of the TLOG are specified by four parameters that you set in the MACHINES section of the UBBCONFIG file.

We recommend that you create a TLOG on each machine that participates in global transactions.