Shantanu's Blog

Database Consultant

April 23, 2009

InnoDB Disk fragmentation

InnoDB Disk fragmentation

Here is how you can check the innodb fragmentation.

mysql> SELECT SUM(DATA_LENGTH+INDEX_LENGTH) FROM TABLES WHERE ENGINE='INNODB';
+-------------------------------+
| SUM(DATA_LENGTH+INDEX_LENGTH) |
+-------------------------------+
| 455770112 |
+-------------------------------+
1 row in set (4 min 43.31 sec)

mysql> system ls /var/lib/mysql/ibdata* -l
-rw-rw---- 1 mysql mysql 1251999744 Apr 22 09:32 /var/lib/mysql/ibdata1

Labels: mysql tips

posted by shantanu # Thursday, April 23, 2009 0 comments

April 21, 2009

MySQL Case Study - 174

Finding Numbers

How do I find only INT, BIGINT numbers from a column?
For e.g. in the following column I want to return 43344433 only
And not 434-433 or any other row that has dash or comma or space.

mysql> select * from ztest where name REGEXP '[[:digit:]]-';
+-----------+
| name |
+-----------+
| 434-433 |
| 4334-4433 |
+-----------+
2 rows in set (0.00 sec)

mysql> select * from ztest ;
+--------------------------+
| name |
+--------------------------+
| '004500' '00984' |
| '0304500' , '020984' |
| '000304500' , '00020984' |
| '000304500' '00020984' |
| '000304500 00020984' |
| '000304500, 00020984' |
| 434-433 |
| 4334-4433 |
| 43344433 |
+--------------------------+
9 rows in set (0.00 sec)

Labels: mysql case study, mysql FAQ

posted by shantanu # Tuesday, April 21, 2009 1 comments

April 13, 2009

UNIX case study - 16

Forcing pipe output

Pipe does not necessarily pass on the information to the next command unless the next command "listen" to the input. In the following example, we are getting the file list from the current directory.

# locate my.cnf | ls -lt | head
total 19136
-rw-r--r-- 1 root root 9557 Apr 13 14:52 1304.txt
drwxr-xr-x 8 root root 4096 Apr 13 13:19 Desktop
drwxr-xr-x 14 root root 4096 Apr 13 12:12 firefox

You need to use xargs command to forcefully hand over the output of the first command to the second command that does not behave.

# locate my.cnf | xargs ls -lt
-rw-r--r-- 1 root root 5299 Mar 6 12:35 /etc/mysql/my.cnf
-rw-r--r-- 1 root root 4321 Jan 21 10:16 /root/daily/todel/todel_shantanu/my.cnf
-rw-r--r-- 1 root root 3017 Aug 13 2008 /etc/my_cnf_bckup/my.cnf.rpmsave

Labels: linux tips, unix case study

posted by shantanu # Monday, April 13, 2009 0 comments

April 09, 2009

UNIX case study - 15

Grepping lines in order

I am stuck on a simple issue but couldn't find a simple solution. If you have any ideas please help.

I have two files : -

FILE1
Tue 09/12 Lindsey
Wed 09/13 Randy
Thu 09/14 Susan
Fri 09/15 Randy
Sat 09/16 Lindsey
Sun 09/17 Susan

FILE2
Fri
09/12
Sat
09/13

I want to grep all the lines from FILE1 which contain the pattern in FILE2 and in the same order of FILE2

I tried ' grep -f FILE2 FILE1'

The output is -
Tue 09/12 Lindsey
Wed 09/13 Randy
Fri 09/15 Randy
Sat 09/16 Lindsey

I am getting all the desired lines from FILE1 but NOT in the order present in FILE2.

Required OUTPUT is : -
Fri 09/15 Randy
Tue 09/12 Lindsey
Sat 09/16 Lindsey
Wed 09/13 Randy

http://www.unix.com/shell-programming-scripting/106745-how-grep-lines-particular-order.html

Labels: unix case study

posted by shantanu # Thursday, April 09, 2009 0 comments

UNIX case study - 14

Replace text in another file using awk

I have a script. The required field is getting replaced with $name/$field2..

for name in $(nawk -F'|' -v OFS='|' '$2="$name"' temp2 > temp3
done

Files
temp4
gg
re
tt
vv
qq

temp2
11|22|33|44|zz
11|22|33|44|zz
11|22|33|44|zz
11|22|33|44|zz
11|22|33|44|zz

outputf file(temp3)
11|$name|33|44|zz
11|$name|33|44|zz
11|$name|33|44|zz
11|$name|33|44|zz
11|$name|33|44|zz

required output
11|gg|33|44|zz
11|re|33|44|zz
11|tt|33|44|zz
11|vv|33|44|zz
11|qq|33|44|zz

My requirements
===================

file1
11|22|33|44|zz
11|22|33|44|zz
11|22|33|44|zz
11|22|33|44|zz
11|22|33|44|zz

file2
aa|bb|cc1|dd|55
aa|bb|cc2|dd|55
aa|bb|cc3|dd|55
aa|bb|cc4|dd|55
aa|bb|cc5|dd|55

required output
11|22|cc1|44|zz
11|22|cc2|44|zz
11|22|cc3|44|zz
11|22|cc4|44|zz
11|22|cc5|44|zz

I need to replace the 3rd field of file1 with 3rd field of file2 for all records(1st record should be replaced with 1st record only of the other file)
Both files have same number of lines as well as fields.

http://www.unix.com/shell-programming-scripting/106742-help-replace-field-one-file-field-another-file.html

Labels: unix case study

posted by shantanu # Thursday, April 09, 2009 0 comments

UNIX case study - 13

Extract Values from CSV
Hi,

I need to extract values from a CSV file based on some conditions as explained below:

File format details:

1. each set starts with AAA only
2. number of columns is fixed
3. number of rows per set may vary (as they are having different CCC rows)

Now, i need to extract 3rd column of AAA and 4th columns of the lines starting with CCC of that set. These values of 1 dataset to form one line.

For. e.g, i have data for 3 sets and file has the below:

AAA,1,a,b,c,d
BBB,1,j,k,l,m
CCC,1,p,q,r,s
CCC,1,w,x,y,z
AAA,2,j,k,l,m
BBB,2,a,b,c,d
CCC,2,p,q,r,s
AAA,3,w,x,y,z
BBB,3,a,b,c,d
CCC,3,p,q,r,s
CCC,3,m,n,o,p
CCC,3,i,j,k,l

then the output must be (3 lines only as 3 data sets exist)

a,q,x
j,q
w,q,n,j

Please advise.

http://www.unix.com/shell-programming-scripting/106738-extract-values-csv.html

Labels: unix case study

posted by shantanu # Thursday, April 09, 2009 0 comments

April 03, 2009

UNIX case study - 12

You can feed the for loop with the output of a function. Don't say nobody told me!!

generate_list ()
{
echo "one two three"
}

for word in $(generate_list)
do
echo "$word"
done

# one
# two
# three

Labels: linux tips, unix case study

posted by shantanu # Friday, April 03, 2009 0 comments

Archives

June 2001 July 2001 January 2003 May 2003 September 2003 October 2003 December 2003 January 2004 February 2004 March 2004 April 2004 May 2004 June 2004 July 2004 August 2004 September 2004 October 2004 November 2004 December 2004 January 2005 February 2005 March 2005 April 2005 May 2005 June 2005 July 2005 August 2005 September 2005 October 2005 November 2005 December 2005 January 2006 February 2006 March 2006 April 2006 May 2006 June 2006 July 2006 August 2006 September 2006 October 2006 November 2006 December 2006 January 2007 February 2007 March 2007 April 2007 June 2007 July 2007 August 2007 September 2007 October 2007 November 2007 December 2007 January 2008 February 2008 March 2008 April 2008 July 2008 August 2008 September 2008 October 2008 November 2008 December 2008 January 2009 February 2009 March 2009 April 2009 May 2009 June 2009 July 2009 August 2009 September 2009 October 2009 November 2009 December 2009 January 2010 February 2010 March 2010 April 2010 May 2010 June 2010 July 2010 August 2010 September 2010 October 2010 November 2010 December 2010 January 2011 February 2011 March 2011 April 2011 May 2011 June 2011 July 2011 August 2011 September 2011 October 2011 November 2011 December 2011 January 2012 February 2012 March 2012 April 2012 May 2012 June 2012 July 2012 August 2012 October 2012 November 2012 December 2012 January 2013 February 2013 March 2013 April 2013 May 2013 June 2013 July 2013 September 2013 October 2013 January 2014 March 2014 April 2014 May 2014 July 2014 August 2014 September 2014 October 2014 November 2014 December 2014 January 2015 February 2015 March 2015 April 2015 May 2015 June 2015 July 2015 August 2015 September 2015 January 2016 February 2016 March 2016 April 2016 May 2016 June 2016 July 2016 August 2016 September 2016 October 2016 November 2016 December 2016 January 2017 February 2017 April 2017 May 2017 June 2017 July 2017 August 2017 September 2017 October 2017 November 2017 December 2017 February 2018 March 2018 April 2018 May 2018 June 2018 July 2018 August 2018 September 2018 October 2018 November 2018 December 2018 January 2019 February 2019 March 2019 April 2019 May 2019 July 2019 August 2019 September 2019 October 2019 November 2019 December 2019 January 2020 February 2020 March 2020 April 2020 May 2020 July 2020 August 2020 September 2020 October 2020 December 2020 January 2021 April 2021 May 2021 July 2021 September 2021 March 2022 October 2022 November 2022 March 2023