Difference between revisions of "Converting MyISAM tables to InnoDB"

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(Added script that can be used to convert database table engines)
 
(Added proper code highlighting for bash)
 
Line 4: Line 4:
 
# Run the script below direct from the console or in screen, in case you lose your network connection.
 
# Run the script below direct from the console or in screen, in case you lose your network connection.
  
#!/bin/bash
+
<source lang="bash">
 +
#!/bin/bash
 +
 
 +
if [ -z $1 ]; then
 +
  echo "Usage: $0 <DATABASE_NAME>"
 +
  exit 1
 +
fi
 +
 
 +
database=$1
 +
read -p "Please enter the hostname of the server hosting this database [localhost]: " hostname
 +
read -p "Please enter a username that has permission to alter tables [root]: " username
 +
read -sp "Please enter the password for this user: " password
 
   
 
   
if [ -z $1 ]; then
+
if [ -z "$hostname" ]; then
  echo "Usage: $0 <DATABASE_NAME>"
+
    hostname="localhost"
  exit 1
+
fi
fi
+
if [ -z "$username" ]; then
+
    username="root"
database=$1
+
fi
read -p "Please enter the hostname of the server hosting this database [localhost]: " hostname
+
mysql_password=""
read -p "Please enter a username that has permission to alter tables [root]: " username
+
if [ ! -z $password ]; then
read -sp "Please enter the password for this user: " password
+
    mysql_password="-p$password"
+
fi
if [ -z "$hostname" ]; then
+
mysql_start="mysql -h $hostname -u $username $mysql_password $database"
    hostname="localhost"
+
 
fi
+
for t in $(echo "show tables" | $mysql_start --batch --skip-column-names); do
if [ -z "$username" ]; then
+
    sql="ALTER TABLE \`$t\` ENGINE = InnoDB;"
    username="root"
+
    echo $sql
fi
+
    time $mysql_start -e "$sql";
mysql_password=""
+
done
if [ ! -z $password ]; then
+
</source>
    mysql_password="-p$password"
+
fi
+
mysql_start="mysql -h $hostname -u $username $mysql_password $database"
+
+
for t in $(echo "show tables" | $mysql_start --batch --skip-column-names); do
+
    sql="ALTER TABLE \`$t\` ENGINE = InnoDB;"
+
    echo $sql
+
    time $mysql_start -e "$sql";
+
done
+

Latest revision as of 15:57, 5 August 2019

Below is Bash script that will convert all tables to InnoDB if they are currently MyISAM. If tables are already InnoDB nothing will change and the script should complete quite quickly. If not you may find it takes several hours to run. It is advised that if you are running this on a live repository you do the following:

  1. Take the repository offline (i.e. either completely stop Apache and the EPrints indexer or get the former to load a splash screen saying the repository is down for maintenance).
  2. Take a backup of the database or if you are running the server as a virtual machine, a snapshot of the whole server.
  3. Run the script below direct from the console or in screen, in case you lose your network connection.
#!/bin/bash
 
if [ -z $1 ]; then
  echo "Usage: $0 <DATABASE_NAME>"
  exit 1
fi
 
database=$1
read -p "Please enter the hostname of the server hosting this database [localhost]: " hostname
read -p "Please enter a username that has permission to alter tables [root]: " username
read -sp "Please enter the password for this user: " password
 
if [ -z "$hostname" ]; then
    hostname="localhost"
fi
if [ -z "$username" ]; then
    username="root"
fi
mysql_password=""
if [ ! -z $password ]; then
    mysql_password="-p$password"
fi
mysql_start="mysql -h $hostname -u $username $mysql_password $database"
 
for t in $(echo "show tables" | $mysql_start --batch --skip-column-names); do
    sql="ALTER TABLE \`$t\` ENGINE = InnoDB;"
    echo $sql
    time $mysql_start -e "$sql";
done