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I am having MySQL 5.1 installed on windows box. Now I would like to upgrade to latest MySQL 5.6 version.

I am planning to install MySQL 5.6 in the same server with same port 3306. After installation, I will map the new installation data directory to the older data directory which is used by MySQL 5.1.

After this, I will upgrade using mysql_upgrade.exe.

Will this plan work out or not ? Also let me know if any precautions to be taken care.

Edit: This is production server and the DB is of huge size 100 GB, so we are not able to go with backup and restore mechanism which is time consuming process.

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    the better plan would be install new server on new port...take backup from old one restore to new one..run mysqlupgrade and then swap ports...any reservations on this let us know – Nawaz Sohail Jun 17 '15 at 14:27
  • This is the better way, but I am having DB of huge size and taking backup and restoring backup will take time. But we are not having much downtime. So wanted to have faster approach. – Phanindra Jun 17 '15 at 15:18
  • You should take you comment (dba.stackexchange.com/questions/104312/…) and put it into the question. – RolandoMySQLDBA Jun 17 '15 at 16:00
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Actually, this plan is kind of dangerous for the mysql schema. Why ?

You are upgrading two versions up. mysql_upgrade will not respond well to this. I have a post where someone upgraded without addressing mysql.user : Any known issues upgrading from MySQL 5.1.73 to 5.6.21?

I have old posts on how to upgrade two versions in one shot

Here is an additional post on how to move the grants with pure SQL : Upgrading mysql myisam 5.1 to mysql 5.6: force innodb on restore?. That post is based on Linux.

To do it in Windows, here are the steps

STEP 01 : Run This

set MYSQL_USER=root
set MYSQL_PASS=rootpassword
set MYSQL_CONN=-u%MYSQL% -p%MYSQL_PASS%
set SQLSTMT="SELECT CONCAT('SHOW GRANTS FOR ',QUOTE(user),'@',QUOTE(host),';')
set SQLSTMT=%SQLSTMT% FROM mysql.user WHERE user<>''"
mysql %MYSQL_CONN% -ANe%SQLSTMT% > GetGrants.sql
echo "SET sql_log_bin = 0;" > MySQLUserGrants.sql
mysql %MYSQL_CONN% -AN < GetGrants.sql >> MySQLUserGrants.sql

STEP 02 : Append a semicolon to every line in MySQLUserGrants.sql

STEP 03 : Load MySQLUserGrants.sql into MySQL 5.6 setup

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You could achieve this with following steps then

  • Installation of new instance on some new port with latest version.
  • Swap the data directory and swap port in config file.
  • Run mysqlupgrade.
  • Verify the new installation.

To be on safer side you may take old database backup(folder copy or mysqldump or mysqlenterprisebackup before the activity etc)

Hope it helps

  • Nawaz, my plan is the same what you mentioned, but I need if any precautions to be taken care other than mysql users. – Phanindra Jun 17 '15 at 16:29

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