DAX fallbacks


 
Thread Tools Search this Thread
Operating Systems Solaris DAX fallbacks
# 1  
Old 07-26-2018
Oracle DAX fallbacks

Hi,

could you explain what DAX fallbacks mean in detail and how to avoid them? Or is it ok to have fallbacks?

Unfortunately googling does not help...



MANpage says: fallbacks == Number of commands completed by the software, which DAX could not complete



OK, but why and what does it mean for the DB?



Running RAC on M7 with InMemory:

1st node=DAX commands 35.608.411 with 18 fallbacks

2nd node=DAX commands 63.563.607 with 2.656.188 fallbacks



Is it just a bad day for the second node? Any ideas how I could dig deeper at OS or DB level?



Thanks in advance and regards

- Martin
Login or Register to Ask a Question

Previous Thread | Next Thread

1 More Discussions You Might Find Interesting

1. Filesystems, Disks and Memory

What is the difference between o_direct and DAX with ext4 filesystem?

I'm trying to understand the difference between o_direct flag of open system call and dax (direct access) with ext4 filesystem. According to my understanding both bypass page cache. But I'm still unclear about the crucial difference between these 2 techniques. If there is a huge difference... (1 Reply)
Discussion started by: BHASKAR JUPUDI
1 Replies
Login or Register to Ask a Question
gitaction(1)						      General Commands Manual						      gitaction(1)

NAME
gitaction - GNU Interactive Tools - per file type action script SYNTAX
gitaction directory file .gitaction directory file DESCRIPTION
gitaction is a script that executes a different action for each file type specified. It is called by the gitfm program when pressing F2 or ^Xa (see the gnuitrc.TERM configuration files in the gnuit manual). The first parameter is the current directory name and the second one is the file name to be matched against the default patterns. The matching is done using the shell 'case' statement. If you press F2 or ^Xa on a *.html file, gitfm will invoke a browser to view it, if you press F2 or ^Xa on a *.tar.gz file, gitfm will list the tar archive contents, if you press the same keys on a *.gz file, gitfm will display its uncompressed contents on the screen, etc ... If you press F2 or ^Xa on a *.gif file or *.jpg file and you have the zgv utility installed, you will be able to see it. If you want to change the gif/jpeg viewer, all you need to do is to change its name in the gitaction script. There are many more file types and viewers that gitaction knows about. In addition, if you are running under GNOME, gnome-open is used, and on MacOS, open(1) is used. see(1) and metamail(1) are also used as fallbacks. If all else fails, the file is displayed using $GNUIT_PAGER. Feel free to change this. If you want to find out what the default action for each file type is (or if you want to modify it), just read/modify the gitaction script. The script can be easily enhanced. Just read it. The .gitaction script is a local version of the gitaction script. When started, gitaction tries to search a script called .gitaction in the current directory and, if it finds it, it starts it. If .gitaction's exit code is 0 ( .gitaction couldn't find a matching pattern), gitac- tion starts its own case statement trying to match the current file name (the second parameter) against its default patterns. The .gitaction script *must* be executable. An example of .gitaction can be found in the directory gitfm is installed into. (usually /usr/local/bin or /usr/bin) Debian users can find it in /usr/share/doc/gnuit/examples/. You should copy the example to the current direc- tory or your home directory and then modify it. BUGS
Please send bug reports to: gnuit-dev@gnu.org SEE ALSO
gitfm(1) gitps(1) gitview(1) gitmount(1) gitkeys(1) gitrgrep(1) gitunpack(1) AUTHORS
Tudor Hulubei <tudor@cs.unh.edu> Andrei Pitis <pink@pub.ro> Ian Beckwith <ianb@erislabs.net> (current maintainer). gitaction(1)