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If you want to use functions described below just hold down key or keys' combination when your computer is starting.

When you put a mistake into some of your comments in subversion repository it's no need to cry. There are simple ways to correct your mistakes. I will show you two most common possibilities.

After last kernel update I have run into problems with starting system. My computer cannot start the system with new compiled kernel version. Only thing that I changed was root partition type. I've changed it from ext3 to ext4 filesystem. When I tried to run system with new kernel I receive this message:

mount: cannot remount block device /dev/sda2 read-write, is write-protected

Resolution

dmesg gives the answer, it says:

EXT4-fs (sda2): Filesystem with huge files cannot be mounted RDWR without CONFIG_LBDAF 

You need to compile your kernel with "Support for large (2TB+) block devices and files" enabled (CONFIG_LBDAF option in kernel config).

How can you find specific information about your processor? How to check what CPU you have got? If you want to get information about CPU on your computer... I will show you how to find it using two methods.

There is new Cyrus IMAPd 2.4.9beta2 version available to download.You can download it from the snapshots directory: This is an beta release in the 2.4.x series. It fixes couple of bugs in the "deliver" and lmtp codepaths and adds a couple of wishlist items. It also reverts the LMTP delivery fix for Bug #3163, which was implicated in Sieve issues at FastMail.

Have you ever forgotten which Ubuntu version you are using? If it's true here you will find methods how to check Ubuntu version that you are curently running.

  lsb_release -a

  cat /etc/issue

  cat /etc/lsb-release

Has your Mac OS X system crashed many times? Have you had problems with running applications? If your answer is 'yes' - probably you have some troubles with your Mac RAM memory sticks. There are some methods to test memory modules. You should do Mac memory check! I will show you how to do your Mac memory test.

It's probably a problem with your kernel settings. You should recompile the kernel with enables NFS_SERVER option. After running make menuconfig you will find it under File systems > Network File Systems > NFS Server Support.

Lately I've been getting into some troubles with free space in one of Oracle's table. The reason is that I didn't use option AUTOEXTEND when I created the table. If you use AUTOEXTEND option when a table is created, Oracle will extend the table when needed, but sometimes when you need to have more control on space usage don't use AUTOEXTEND option. The only way to get rid of that error is:

1. Clean up table - remove unneeded data

2. Manualy extend database

    ALTER DATABASE DATAFILE 'full_path_to_file' RESIZE 500M;

From time to time I need to check what initialization parameters my Oracle's instances are using (init.ora or spfile). You changed your instance's parameters but after restart you can see the old ones? Have you had a similar problem? Have you got enough of it? The solution is simple.

    sqlplus / as sysdba
    SELECT DECODE (value, NULL,'PFILE', 'SPFILE') "Init File Type" FROM v$parameter WHERE name = 'spfile';

Init F
------
PFILE

  SHOW PARAMETERS 'spfile';

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
spfile                               string

After installing Oracle XE on Debian I got into problems with connection to Oracle's instance. Every connection ended with error 'ORA-12162 TNS:net service name is incorrectly specified' Resolution is very simple - you only have to set correct environment variables:

    export ORACLE_SID=XE
    export ORACLE_HOME=/usr/lib/oracle/xe/app/oracle/product/10.2.0/server

and that's all After that you should also make this change permanent by writing those settings to shell initialization file. For Debian it will be /etc/profile (globally) or per user (.bashrc in user directory) I'm really missing /etc/env.d directory from Gentoo distro...