Ever Helpful: ORA-03113: end-of-file on communication channel:

When attempting to increase the memory_max_target and memory_target parameters to a value over 3 GB, an ORA-03113 is triggered.

SQL> startup
ORA-03113: end-of-file on communication channel
Process ID: ####
Session ID: 170 Serial number: 3

Check the Alert Log:

> vi $ORACLE_BASE/diag/rdbms/$ORACLE_SID/$ORACLE_SID/trace/alert_$ORACLE_SID.log
ALTER DATABASE MOUNT
Errors in file $ORACLE_BASE/diag/rdbms/$ORACLE_SID/$ORACLE_SID/trace/$ORACLE_SID_mman_####.trc:
ORA-27103: internal error
Linux-x86_64 Error: 11: Resource temporarily unavailable
Additional information: -1
Additional information: 1
MMAN (ospid: 8169): terminating the instance due to error 27103
Instance terminated by MMAN, pid = ####

Download and Install the Patch:

This is an error specific to Oracle 11g version 11.1.0.7.0 (the patched version) on 64-bit Linux. Log into Metalink, and then download and install patch number 7272646, ORA-27103 WHEN MEMORY_TARGET > 3G, with the file name p7272646_11107_Linux-x86-64.zip.

First, Set Default File Permissions:

> cd /var/www/html
> find . -type d -exec chmod 755 {} \;
> find . -type f -exec chmod 644 {} \;

Navigate to the WordPress root directory. For all sub-directories, grant full privileges to the owner, and then only read and execute privileges to all others. For files, grant full privileges to the owner, and then only the read privilege to all others.

Next, Set Permissions for the Uploads Directory:

> cd /var/www/html/wp-content
> chmod 777 uploads
> cd uploads
> find . -type d -exec chmod 777 {} \;
> find . -type f -exec chmod 666 {} \;

WordPress intended this folder to be writeable by all. Note that we do not grant execute privileges to the files.

Optionally Allow Write on Theme Files:

> cd /var/www/html/wp-content/themes/themename
> chmod 666 *.php
> chmod 666 *.css

Grant read and write privileges to all for the PHP and Cascading Style Sheet (CSS) files if you wish to use the built-in theme editor in the WordPress administration console.

Optionally Allow Write on .htaccess:

> cd /var/www/html
> chmod 666 *.htaccess

Grant read and write privileges to all for the .htaccess file in the WordPress root directory if you wish to allow WordPress to automatically generate rewrite rules for you. It is good practice to remove the write privilege from all others (chmod 644 .htaccess) after you are done configuring WordPress in the administration console. Unless you are making changes to settings, WordPress does not normally need write access to this file.

Optionally Allow Additional Permissions:

> cd /var/www/html
> chmod 666 sitemap.xml
> chmod 666 sitemap.xml.gz

Third party themes and plugins may require additional permissions. Please refer to their documentation for instructions. In this example, read and write privileges are granted to all for files manipulated by the popular Google (XML) Sitemaps Generator plugin.

First, Execute the Binary:

> mv jre-6u16-linux-x64.bin /usr/lib/java
> cd /usr/lib/java
> chmod 744 jre-6u16-linux-x64.bin
> ./jre-6u16-linux-x64.bin

Download the 32-bit or 64-bit non-RPM binary from Sun’s site and execute it.

Next, Set Sun’s Java as Default:

> update-alternatives --install "/usr/bin/java" "java" "/usr/lib/java/jre1.6.0_16/bin/java" 1
> update-alternatives --set java /usr/lib/java/jre1.6.0_16/bin/java

We configure the system to use Sun’s Java binaries to execute “java” commands by telling it there is an alternate installation and to use it by default.

Finally, Check the Default Version:

> java -version
java version “1.6.0_16″
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) 64-Bit Server VM (build 14.2-b01, mixed mode)

Install the Software Update:

Go to http://www.microsoft.com/downloads/details.aspx?FamilyID=17c36612-632e-4c04-9382-987622ed1d64&DisplayLang=en to download and install the KB907306 software update.

Map a Network Drive:

Go to Start > Computer, and then click on the Map network drive button. In the Map Network Drive dialog, click on the link labeled Connect to a Web site that you can use to store your documents and pictures. In the Add Network Location dialog, click the Next button. In the next dialog, click the Choose a custom network location button.

Set Up the WebDAV Folder:

In the third Add Network Location dialog, enter the address of the WebDAV folder, and then click the Next button.

Test the Function:

SQL> select soundex('Ashcraft')
from dual;

A226

Ashcraft should return A261 and not A226.

Create the Function:

SQL> create or replace function soundexxcode (character varchar2) return number is
   v_digit number(1,0);
begin
   case
      when character in ('B', 'F', 'P', 'V') then v_digit := 1;
      when character in ('C', 'G', 'J', 'K', 'Q', 'S', 'X', 'Z') then v_digit := 2;
      when character in ('D', 'T') then v_digit := 3;
      when character in ('L') then v_digit := 4;
      when character in ('M', 'N') then v_digit := 5;
      when character in ('R') then v_digit := 6;
      when character in ('H', 'W') then v_digit := 0;
      else v_digit := NULL;
   end case;

   return v_digit;
end soundexxcode;
/

Function created.

SQL> create or replace function soundexx (string varchar2) return varchar2 is
   v_digit number(1, 0);
   v_digit_last number(1, 0);
   v_soundex varchar2(64);
   v_string varchar2(64);
begin
   v_string := upper(string);
   v_soundex := substr(v_string, 1, 1);
   v_digit_last := soundexxcode(v_soundex);

   for i in 1 .. length(v_string) loop
      v_digit := soundexxcode(substr(v_string, i, 1));

      if v_digit > 0 And v_digit <> nvl(v_digit_last, 0) then
         v_soundex := v_soundex || v_digit;
      end if;

      if nvl(v_digit, 0) <> 0 then
         v_digit_last := v_digit;
      end if;
   end loop;

   return rpad(v_soundex, 4, '0');
end soundexx;
/

Function created.

Test the New Function:

SQL> select soundexx('Ashcraft')
from dual;

A261

Create the Function:

SQL> create or replace function is_numeric (v_value varchar2) return boolean is
   v_data number;
begin
   v_data := to_number(v_value);
   return true;

exception
   when others then
      return false;
end is_numeric;
/

Function created.

Test the New Function:

SQL> set serveroutput on

begin
   if is_numeric('123') = true then
      dbms_output.put_line ('True');
   else
      dbms_output.put_line ('False');
   end if;

   if is_numeric(123) = true then
      dbms_output.put_line ('True');
   else
      dbms_output.put_line ('False');
   end if;

   if is_numeric('AAA') = true then
      dbms_output.put_line ('True');
   else
      dbms_output.put_line ('False');
   end if;
end;
/

True
True
False

PL/SQL procedure successfully completed.

Go to Command Line:

Go to Start > Accessories > Command Prompt

Delete Spooled Files:

C:> net stop spooler
C:> del %systemroot%system32spoolprinters*.shd
C:> del %systemroot%system32spoolprinters*.spl
C:> net start spooler

First, stop the print spooler, then delete the spooled files, and then start the printer spooler.

First, List the Filesystems:

> fdisk -l

Use fdisk, the partition table manipulator for Linux, to list all partition tables.

Mount a Partition:

> mkdir /mnt/usbdrive
> mount /dev/sdb1 /mnt/usbdrive

Create a directory as a mount point and then mount the partition to the directory.

Mount a NTFS Partition:

> mkdir /mnt/usbdrive
> mount -t ntfs-3g /dev/sdb1 /mnt/usbdrive

You may need to install the ntfs-3g driver (yum install ntfs-3g).

Mount a Samba Share:

> mkdir /mnt/smbshare
> mount //192.168.1.101/data /mnt/smbshare -o username=mnguyen,password=password

Install fuse and wdfs To Mount a WebDAV Folder:

> yum install fuse wdfs

Mount a WebDAV Folder:

> mkdir /mnt/webdav
> wdfs http://webdav.domain.com/ /mnt/webdav -o username=mnguyen,password=password,allow_other

Unmount a Filesystem:

> umount /mnt/usbdrive

If the filesystem is busy, determine what process is using the filesystem (e.g. /dev/sdb1) with “fuser -m /dev/sdb1” and then look up the PID (e.g. 123) with “ps auxw | grep 123“.

Validation improves data integrity especially when you need entry to be consistent. For example, the value “United States of America” could also be entered as: United States, US, USA, America, and more. Consistency improves the results of many tasks such as sorting, grouping, and various aggregate functions.

Setup a Named Ranged:

Open Microsoft Excel, activate Sheet2, and create a list of colors. Select the cells, and then go to Insert > Name > Define (shortcut: ctrl + F3). In the Define Name dialog, let’s name the range “ListColors.”

Create the Validation Rule:

Activate Sheet1, select a range of cells for validation, and then go to Data > Validation. In the Data Validation dialog, select the Settings tab, and then change the Allow combobox to “List” and enter “=ListColors” for the Source. Make sure In-cell dropdown is checked.

Test It Out:

Each selected cell is now embedded with a combobox. Items appear in the list as they appear in the named range, including sort order. Users may key in a value or select an item from the dropdown. An error message appears if the user attempts to enter a value not listed in your named range.

Finally, Hide Your Named Ranges:

Activate Sheet2, and then go to Format > Sheet > Hide.

Analyze EBCDIC File:

Suppose we have a file in EBCDIC format with the following field name, offset, size, and type elements:

field1 0 10 ebcdic string(10)
field2 10 5 packed decimal(5)
field3 15 1 ebcdic string(1)

Next, Create an Oracle Table:

SQL> create table ebcdic_table
(
   field1 varchar2(10)
   field2 number(9)
   field3 varchar2(1)
);

Note the numeric field length. Each byte of a packed decimal contains two digits. So “field2″ is 5 * 2 = 10 = 9 digits plus the symbol. Use 5 if the numeric field is not a packed decimal.

Create SQL Loader Control File:

> vi sqlldr.ctl
LOAD DATA CHARACTERSET WE8EBCDIC500
INFILE '/home/mnguyen/filename' "fix 16"
APPEND INTO TABLE MNGUYEN.EBCDIC_TABLE
(
   FIELD1 position(1:10) char,
   FIELD2 position(11:15) decimal,
   FIELD3 position(16:16) char
)

> sqlldr mnguyen control=sqlldr.ctl log=sqlldr.log

It is super easy because Oracle handles the conversion via its built-in SQL Loader tool. Use the WE8EBCDIC500 character set and specify the correct record length (i.e. “fix #”) if an ASCII newline character is not used in the EBCDIC data. Use the “decimal external” data type if the numeric field is not a packed decimal.