Oracle: Sql script to check tablespace size

Every once in a while one of my test jobs fails, throwing this error that the table-space its created in has no further space to allocate for this table. And then comes the next sets of steps. Find out the other table space which is free. Here is a very basic SQL scripts which I use to list down all the table-spaces and their size in human readable format.

Update: Replacing with Github Gist

Mysql: Count Occurrence of a particular character in a given String

Count Occurrence of Character in a String Using MySQL « In Piscean’s Heart

Since there is no inbuilt MySQL function to count the occurrence of a character in string, we can do it by using these steps:

1. Counting the number of characters in the original string

2. Temporarily ‘deleting’ the character you want to count and count the string again

3. Subtract the first count from the second to get the number of occurrences

Example:

SELECT LENGTH('foobarfoobarfoobar') - LENGTH(REPLACE('foobarfoobarfoobar', 'b', '')) AS `occurrences`
--> Result: 3

In this example ‘b’ is the string you want to count the number of occurrences.

Simple Income Tax Calculator

Maintaining this simple income tax calculator for Indian Employees.

The tax calculator can be found at the following url.

India: Income Tax Calculator

*N*X: Shell Hack : Use a Different Color for the root Shell

Today's Lifehacker tells how to do it.


Lifehacker - Use a Different Color for the Root Shell Prompt - Terminal

Use a Different Color for the Root Shell Prompt
By The How-To Geek, 1:00 PM on Thu Apr 2 2009, 3,749 views (Edit post, Set to draft, Slurp)

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Linux only: Reader Chris writes in with an excellent tip that changes the prompt to red when using the root account from the terminal—as a reminder to be more careful.

Using the tip is relatively simple—just edit the /root/.bashrc file and add in the following, preferably commenting out the existing lines that set the color, though you can simply add this line to the end of the file.

PS1='${debian_chroot:+($debian_chroot)}\[\033[01;31m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '

Once you've added this line, anytime you switch to using the root shell you will see the prompt in red with white text for the command line. Chris takes it further, with a line that turns the prompt green for regular users, which you can enable by adding the following to your ~/.bashrc file:

PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '

This tip can really come in handy if you have a bunch of terminal windows open at once, so you can tell at a glance which ones are using root mode and which aren't

Mysql: Client Tips 2: Running Shell Commands from the Commandline

Ok, As you know I am trying to explore more of the mysql command line and exploring its features. I have already written about how to change default mysql prompt using the command "prompt" in one of my previous articles.

Continuing this series. I am focusing today on the "system" command or "/!".

Well, I always have some of the sql source files and I execute it from the mysql command line. But I just keep forgetting their names. And most of the times I either close the mysql session and do 'ls' at the command line or move the mysql session in background and do a 'ls'.

Mysql cli has this very useful command called "system" using which you can execute shell commands from mysql client itself.

just type

  system ls -l

or

  \! ls -l

Some of us, who are familiar with Vim, will like this "\!" version a lot, because we are already using ! to run system commands there.

You can run almost all system commands using either of system or '\!'

Some examples:

mysql:root@test [14:26:19 pm]$ \! pwd
/home/owner

mysql:root@test [14:29:33 pm]$ \! date
Thu Mar 26 14:29:46 SGT 2009

mysql:root@test [14:29:46 pm]$ \! bash
owner@rocky-desktop:~$ exit
mysql:root@test [14:30:12 pm]$

You see the last one is quiet interesting. You can actually open a shell using this command perform some tasks. Just exit from the shell and you are back in the mysql world.

Liked it ! Start playing with mysql client system command.

Mysql: Comments Trick

Nice article by Eli White. Now you can understand easily all those comments that you see in the mysqldump output.


MySQL Trick with Comments

MySQL has a custom extension (if you want to call it that) to it’s commenting system, which actually allows you to make conditional commands. The mysqldump program that many people use to back up their databases uses this concept heavily, which is where I first ran into it.

In it’s simplest form, this allows you to place commands in a SQL file that only MySQL will run:

/*! MySQL specific code */

This allows you to make a single SQL file, that not only will execute correctly (and in detail) on MySQL, but it will also work on any ANSI compatible database, since you’ve hidden any of the non-ANSI parts in MySQL conditional comments. So for example, MySQL allows you to set a variable declaring that all names will be a certain character set, such as UTF-8, and therefore you can do:

/*! SET NAMES utf8 */;

MySQL: Query to List Down All Schema Objects

Below is a simple query to ease your day to day work. It simply lists down all the objects of a MySQL Schema. The things that you are mostly interested in e.g. Tables, Views, Routines, Indexes, Triggers and so on.

Just replace "[your-schema-name-here]" in the following query with your schema name. Hope it comes handy to some of you out there.

Update:05/27/2015 - Adding Github Gist for the script

SELECT OBJECT_TYPE
,OBJECT_SCHEMA
,OBJECT_NAME
FROM (
SELECT 'TABLE' AS OBJECT_TYPE
,TABLE_NAME AS OBJECT_NAME
,TABLE_SCHEMA AS OBJECT_SCHEMA
FROM information_schema.TABLES

UNION

SELECT 'VIEW' AS OBJECT_TYPE
,TABLE_NAME AS OBJECT_NAME
,TABLE_SCHEMA AS OBJECT_SCHEMA
FROM information_schema.VIEWS

UNION

SELECT 'INDEX[Type:Name:Table]' AS OBJECT_TYPE
,CONCAT (
CONSTRAINT_TYPE
,' : '
,CONSTRAINT_NAME
,' : '
,TABLE_NAME
) AS OBJECT_NAME
,TABLE_SCHEMA AS OBJECT_SCHEMA
FROM information_schema.TABLE_CONSTRAINTS

UNION

SELECT ROUTINE_TYPE AS OBJECT_TYPE
,ROUTINE_NAME AS OBJECT_NAME
,ROUTINE_SCHEMA AS OBJECT_SCHEMA
FROM information_schema.ROUTINES

UNION

SELECT 'TRIGGER[Schema:Object]' AS OBJECT_TYPE
,CONCAT (
TRIGGER_NAME
,' : '
,EVENT_OBJECT_SCHEMA
,' : '
,EVENT_OBJECT_TABLE
) AS OBJECT_NAME
,TRIGGER_SCHEMA AS OBJECT_SCHEMA
FROM information_schema.triggers
) R
WHERE R.OBJECT_SCHEMA = [your-schema-name-here];