The obligatory disclaimer: The more performance you gain, the more data integrity you loose! But if you want to tune something like a file system, I strongly assume that you know what you are doing :) These tips apply to all major Linux distributions like Fedora/Red Hat, OpenSUSE, and Ubuntu that are already using ext4 or are going to make ext4 their default file system. As write operations on Solid State Disks (SSD) are expensive the tips below are focused on SSD usage but also apply to HDD usage as well . My Ubuntu 9.04 Jaunty /etc/fstab after a fresh installation: [...] UUID=d818ddf9-ff01-e21a-a67d-3ceab43a9e2b / ext4 relatime,errors=remount-ro 0 1 UUID=0d339122-74e0-e0ea-805a-7879b1fa3172 /home ext4 relatime 0 2 [...] My tuned Ubuntu 9.04 Jaunty /etc/fstab : [...] UUID=d818ddf9-ff01-e21a-a67d-3ceab43a9e2b / ext4 noatime,barrier=0,nobh,commit=100,nouser_xattr 0 1 UUID=0d339122-74e0-e0ea-805a-7879b1fa3172 /home ext4 noatime,barrier=0,data=writeback,nobh,commit=100,nouser_xattr 0
Use " sys as sysdba " as user name or supply the internal_logon with the value sysdba in the advanced properties tab. So internal_login is the property name that should be used to mark the current user as a sysdba.
If you understand the following cases, you understand Java 8' new interface model . The code below, won't compile throwing this error: java: class FooBar inherits unrelated defaults for someMethod() from types Foo and Bar Java 8: Won't compile Java 8: Compiles The code above compiles and prints: FooBar#main FooBar#someMethod() Foo#someOtherMethod() The code below won't compile as well and throws this familiar (for Java < 8 JDKs) error message: java: FooBar is not abstract and does not override abstract method someMethod() in Foo Java 8: Won't compile As you might see in this examples, starting with JDK 8 , Java has introduced a kind of multiple inheritance as both, the class and its interface might contain an implementation of the same method (same name & signature). To address the diamond problem there is a precedence in which order an implementation is used: only if the class implements all default / optional methods o