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Don Burleson Blog 







adaptive_scalable_log_writer parameters

Oracle Database Tips by Donald BurlesonMay 20, 2016

Question: What are the 12c parameters that relate to the adaptive_scalable_log_writer feature?

Answer:  Here is some of the new undocumented parameters that relate to the log_buffer size and the low writer (LGWR) process:

_adaptive_scalable_log_writer_enable_worker_threshold Increase in redo generation rate as a percentage

_adaptive_scalable_log_writer_disable_worker_threshold Percentage of overlap across multiple outstanding writes

_adaptive_scalable_log_writer_sampling_count Evaluate single versus scalable LGWR every N writes

_adaptive_scalable_log_writer_sampling_time Evaluate single versus scalable LGWR every N seconds

_adaptive_scalable_log_writer_enable_worker_aging Per million of redo gen rate when LGWR workers were last used


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