Migrate error gave the following

hostmasterUI.1

Loading mysql driver for the db service
Loaded alias @platform_drupal723 from file /var/aegir/.drush/platform_drupal723.alias.drushrc.php
WD php: PDOException: SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 1000 bytes: ALTER TABLE {sessions} ADD PRIMARY KEY (`sid`, `ssid`); Array ( ) in db_add_primary_key() (line 2891 of /var/aegir/platforms/drupal-7.23/includes/database/database.inc).
Drush command terminated abnormally due to an unrecoverable error.
Drush was not able to start (bootstrap) the Drupal database. Hint: This may occur when Drush is trying to: * bootstrap a site that has not been installed or does not have a configured database. In this case you can select another site with a working database setup by specifying the URI to use with the --uri parameter on the command line. See `drush topic docs-aliases` for details. * connect the database through a socket. The socket file may be wrong or the php-cli may have no access to it in a jailed shell. See http://drupal.org/node/1428638 for details. Drush was attempting to connect to: Drupal version : 7.23 Site URI : devhaa.swingon.in Default theme : garland Administration theme: garland PHP configuration : /etc/php5/cli/php.ini Drush version : 5.9 Drush configuration: /var/aegir/platforms/drupal-7.23/sites/devhaa.swingon.in/drushrc.php /var/aegir/platforms/drupal-7.23/sites/all/drush/drushrc.php Drush alias files : /var/aegir/.drush/hostmaster.alias.drushrc.php /var/aegir/.drush/server_master.alias.drushrc.php /var/aegir/.drush/devhaa.swingon.in.alias.drushrc.php /var/aegir/.drush/platform_hostmaster.alias.drushrc.php /var/aegir/.drush/platform_drupal723.alias.drushrc.php /var/aegir/.drush/platform_Drupal722.alias.drushrc.php /var/aegir/.drush/server_localhost.alias.drushrc.php /var/aegir/.drush/dev.mastered.swingon.in.alias.drushrc.php /var/aegir/.drush/testsite.swingon.in.alias.drushrc.php /var/aegir/.drush/platform_Drupal628.alias.drushrc.php Drupal root : /var/aegir/platforms/drupal-7.23 Site path : sites/devhaa.swingon.in Modules path : sites/devhaa.swingon.in/modules Themes path : sites/devhaa.swingon.in/themes File directory path: sites/devhaa.swingon.in/files %paths : Array
could not bootstrap drupal after updatedb
Template loaded: /usr/share/drush/commands/provision/http/Provision/Config/Apache/vhost.tpl.php