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What is Cloning in ServiceNow?

• ServiceNow

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What is cloning in servicenow?

• A clone is a snapshot of a ServiceNow instance
  typically used to refresh your test or
  development environments. ServiceNow performs
  the cloning process, but there are several
  post-cloning tasks for you to perform as
  described in this article.

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System clone

• The system clone application allows users with
  the clone_admin or admin role to clone data from
  one instance to another.
• This functionality is primarily used to clone a
  production instance over an existing
  sub-production instance before developing or
  testing changes. All clones are performed using
  the most recent nightly backup.

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In response to a clone request,
the ServiceNow platform performs the following
tasks

• Generates a file to preserve operational data on
  the target server. This file contains the data
  preserved by data preservers.
• Copies the database schema from the source
  instance to the target instance.
• Creates tables in the target instance database
  using the source instance table definitions.
• Copies data from the most recent nightly backup
  of the source instance to the target instance
  database.

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• Briefly disables UI traffic and requests to the
  target instance server.
• Displays the message Clone in progress... to any
  user accessing the target instance.
• Restores operational data preserved from the
  target instance.
• Runs any post-clone cleanup scripts on the target
  instance.
• Briefly suspends all email functions on the
  target instance.
• Queues an event to regenerate text indexes.
• Enables UI traffic and requests to the target
  instance server.

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Clone to an instance on a different version

• The System Clone application can target an
  instance running a different instance version
  from the source.
• A central web service controls clone processing
  and automatically modifies the target instance
  version to match the source instance version.
  This matching process starts up to 8 hours before
  the time specified in the Date and time field on
  the System Clone form. This web service also
  ensures that there is enough disk space on the
  target instance for the clone to proceed.

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Clone from a backup

• The platform uses data from the most recent
  nightly backup of the source instance when
  cloning. Backups used for cloning are at most 36
  hours old.
• If a clone from backup fails for any reason, the
  system instead uses the legacy clone engine. The
  legacy clone engine cannot preserve data from
  extended tables, relationships, hierarchies
  between tables, and dot-walked queries. You may
  want to restore the target instance from a backup
  and then reschedule the clone in such cases.

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• After cloning from a backup, the target instance
  is unavailable for several minutes before the
  clone is marked as complete in the source
  instance. If the source and target instances are
  on different versions of the ServiceNow platform,
  the target instance is modified to match the
  source instance version during this time.
• When starting a clone from a backup, the date and
  time the backup was taken, as well as periodic
  progress messages, appear in the Clone
  Log related list.

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Clone over production instances

• Production instances cannot be used as the target
  instance for a clone after the instance is live.
  Production clones are created during non-core
  business hours. Tables are backed up sequentially
  rather than simultaneously. Modifying data on the
  source instance during a clone can cause a data
  mismatch between records or duplicate record
  entries. This issue is minimized by running a
  clone after normal business hours.
• When scheduling a clone for a production
  instance, the system automatically follows this
  process Determines the instance region.
• Determines the non-core business hours for the
  region.
• Restricts the possible cloning time that can be
  specified on the Clone Request form to the
  non-core hours.

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CONTACT US

• If you want to Learn ServiceNow Online Training
  , Contact Visualpath. Visualpath is Leading
  Training Institute for  ServiceNow Online
  Training in Hyderabad. For More Info Call us _at_
  9704455959.

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