How do to the size of the log buffer reduce with huge Pages Linux

Data sheet:

Database: Oracle Standard Edition 11.2.0.4

OS: Oracle Linux 6.5

Processor: AMD Opteron

Sockets: 2

Carrots / power outlet: 16

MEM: 252 GB

Current SGA: GB 122 automatic shared memory (EAMA) management

Special configuration: Linux huge Pages for 190 GB of memory with the page size of 2 MB.

Special configuration II: The use of the LUKS encryption to all drives.

Question:

1. How can I reduce the size of the log buffer? Currently, it appears that 208 MB. I tried to use log_buffer, and it does not change a thing. I checked the granule size is 256 MB with the current size of the SGA.

Reason to reduce:

With the largest size of log buffer the file parallel write newspaper and the synchronization log file is averaged over 45 ms most of the time because she has dumped a lot of stuff at the same time.

Post edited by: CsharpBsharp

You have 32 processors and 252 GB of memory, so 168 private discussions, so 45 MB as the public threads size is not excessive.  My example came from a machine running Oracle 32-bit (as indicated by the size of 64 KB of threads private relative to the size of 128 KB of your son) private with (I think) 4 GB of RAM and 2 CPUs - so a much smaller scale.

Your instance was almost inactive in the meantime so I'd probably look outside the Oracle - but verification of the OS Stats may be informative (is something outside the Oracle using a lot of CPU) and I would like to ask you a few questions about encrypted filesystems (LUKS).  It is always possible that there is an accounting error - I remember a version of Oracle who report sometimes in milliseconds while claiming to centisecondes - so I'll try to find a way to validate the log file parallel write time.

Check the forum for any stats activity all over again (there are many in your version)

Check the histogram to wait for additional log file writes event (and journal of file synchronization - the lack of EPA top 5 looks odd given the appearance of the LFPW and and the number of transactions and redo generated.)

Check the log file to track writer for reports of slow writes

Try to create a controlled test that might show whether or not write reported time is to trust (if you can safely repeat the same operation with extended follow-up enabled for the author of newspaper which would be a very good test of 30 minutes).

My first impression (which would of course be carefully check) is that the numbers should not be approved.

Concerning

Jonathan Lewis

Tags: Database

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