UxOra - Unix and Oracle tech notes
Welcome to UxOra,
This website publishes technical notes on Unix and Oracle (=UxOra) especially as a DBA point of view.
Please read the writing conventions here first.
I hope it may help you.
This article will show to use UDEV instead of ASMLib on Oracle Linux 7.
If for any reason you cannot or don't want to use ASMLib, then you can use UDEV instead. This is an alternative in order to present disks to ASM and this does not required to install an extra layer.
In older ksh or bash, the builtin command
getopts can usually only handle short option.
But newer Korn shell may be able to handle long options as show in an other article.
If you don't have the chance to get a recent shell, or if you want to write more portable script, this article will show how to handle GNU-style long options (
-- double hyphen) using getopts with few extra lines of scripting.
(foobar_any_getopts.sh zip file attachement in this article)
In recent Korn Shell ksh93,
getopts can be more powerful than you think, it can :
- naturally parse short and long options with error management
- manage option value as optional, as mandatory or as numeric
- auto generate man page alike
This article will show how to use
getopts in recent ksh93. If you have older ksh, read this other article instead.
(foobar_getopts.ksh zip file attachement in this article)
It's sometimes painful to create a shell script from scratch ...
So here is a script template that can help to start any good shell script.
This template contains header which is use for usage info as well, useful predefined functions and predefined variables, and manage short and long options.
(template.sh zip file is attached in this article)
After installing Oracle Enterprise Linux 7 (OEL7) virtual machine on VirtualBox (as explained here), I would recommend to install the VirtualBox Guest Additions.
For any serious and interactive use, the VirtualBox Guest Additions will make your life much easier by providing closer integration between host and guest and improving the interactive performance of guest systems.Virtualbox
This article will show step by step how to configure a virtual machine on VirtualBox in order to install Oracle Enterprise Linux 7 (OEL7).
Before going through those steps, you will need to have:
- Oracle VM VirtualBox installed, it can be downloaded from virtualbox.org
- OEL7 (V46135-01) iso image, it can be downloaded from edelivery.oracle.com with a free oracle account
(warning: images-intensive article)
Table monitoring is by default activated if
STATISTICS_LEVEL system parameter is set to
Oracle keeps table monitoring data in memory, then flush it into the dictionary when
FLUSH_DATABASE_MONITORING_INFO is called. These datas are mainly used to determine if objects need new statistics.