Dear all,
I'm a newbie in MySQL so bare my questions.
I have run mysqltuner.pl and It says I have fragmentation in my
tables. Searching around I found this script which reports the
fragmentation in my tables:
========================
#!/bin/sh
echo -n "MySQL username: " ; read username
echo -n "MySQL password: " ; stty -echo ; read password ; stty echo ; echo
mysql -u $username -p"$password" -NBe "SHOW DATABASES;" | grep -v
'lost+found' | while read database ; do
mysql -u $username -p"$password" -NBe "SHOW TABLE STATUS;" $database |
while read name engine version rowformat rows avgrowlength datalength
maxdatalength indexlength datafree autoincrement createtime updatetime
checktime collation checksum createoptions comment ; do
if [ "$datafree" -gt 0 ] ; then
fragmentation=$(($datafree * 100 / $datalength))
echo "$database.$name is $fragmentation% fragmented."
mysql -u "$username" -p"$password" -NBe "OPTIMIZE TABLE $name;" "$database"
fi
done
done
========================
I have run it and reports that several of my innodb tables are fragmented
I have read several articles and I'm a bit confused. I have enabled
innodb_file_per_table from the very beginning
# INNODB #
innodb_log_files_in_group = 2
innodb_log_file_size = 512M
innodb_flush_log_at_trx_commit = 1
innodb_file_per_table = 1
innodb_buffer_pool_size = 2G
I have run either optimize table and alter table mytable engine=INNODB
and both commands don't end up shrinking the space in the idb files. The
script above reports the same fragmentation.
Regards,
Miguel
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