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

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