Can one instance have multiple redo threads ?

i was reading the Oracle Data guard 10g guide and it says
Determine the appropriate number of standby redo log file groups.
Minimally, the configuration should have one more standby redo log file group than the number of online redo log file groups on the primary database. However, the recommended number of standby redo log file groups is dependent on the number of threads on the primary database. Use the following equation to determine an appropriate number of standby redo log file groups:
(maximum number of logfiles for each thread + 1) * maximum number of threads
Using this equation reduces the likelihood that the primary instance's log writer (LGWR) process will be blocked because a standby redo log file cannot be allocated on the standby database. For example, if the primary database has 2 log files for each thread and 2 threads, then 6 standby redo log file groups are needed on the standby database
while Oracle's definition of redo log states the following
Redo Threads
When speaking in the context of multiple database instances, the redo log for each database instance is also referred to as a redo thread. In typical configurations, only one database instance accesses an Oracle Database, so only one thread is present. In an Oracle Real Application Clusters environment, however, two or more instances concurrently access a single database and each instance has its own thread of redo.
this is confusing, in a typical environment where only one instance accesses a database, can we have more than one redo thread ?

Though you can create multiple threads but of no use in NON-RAC or non-parallel server configuration.
Following is the generic formula. You should consider
maximum number of threads = 1 for single instance (NON-RAC).
(maximum number of logfiles for each thread + 1) * maximum number of threads
Message was edited by:
Reega

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