When database administrators work on a Data Guard problem or plan an important Data Guard operation such as role transition, they generally prefer to gather comprehensive trace information about the activity of Data Guard-related processes. For this purpose, Oracle offers the LOG_ARCHIVE_TRACE parameter. By setting this parameter to an appropriate value, it's possible to have detailed information about log archiving, redo transport, and Redo Apply activities.
The default value of this initialization parameter is 0, which means the additional tracing feature is off, and Oracle will continue generating its default alert and trace entries related to error conditions. It's possible to change the value of this parameter in the primary and/or standby databases online using the ALTER SYSTEM statement. For example, look at the following statement:
SQL> ALTER SYSTEM SET LOG_ARCHIVE_TRACE=15;
In the Real Application Cluster database it's possible to set different tracing...