Version sans cache

Mise en cache désactivé. Réglage défaut pour cette page : actif (code DEF204)
Si l'affichage est trop lent, vous pouvez désactiver le mode utilisateur pour visualiser la version en cache.

Rechercher dans le manuel MySQL

5.6.7.8 Remote Cloning Operation Failure Handling

Table des matières

This section describes failure handing at different stages of a cloning operation.

  1. Prerequisites are checked (see Remote Cloning Prerequisites).

    • If a failure occurs during the prerequisite check, the CLONE INSTANCE operation reports an error.

  2. A backup lock is taken to block DDL operations.

    • If the cloning operation is unable to obtain a DDL lock within the time limit specified by the clone_ddl_timeout variable, an error is reported.

  3. User-created data (schemas, tables, tablespaces) and binary logs on the recipient are removed before data is cloned to the recipient data directory.

    • When user created data is removed from the recipient during a remote cloning operation, existing data in the recipient data directory is not saved and may be lost if a failure occurs. If the data to be replaced on the recipient is of importance, a backup should be taken before initiating a remote cloning operation.

      For informational purposes, warnings are printed to the server error log to specify when data removal starts and finishes: 

      [Warning] [MY-013453] [InnoDB] Clone removing all user data for provisioning:
Started...

[Warning] [MY-013453] [InnoDB] Clone removing all user data for provisioning:
Finished

      If a failure occurs while removing data, the recipient may be left with a partial set of schemas, tables, and tablespaces that existed before the cloning operation. Any time during the execution of a cloning operation or after a failure, the server is always in a consistent state.

  4. Data is cloned from the donor. User-created data, dictionary metadata, and other system data are cloned.

    • If a failure occurs while cloning data, the cloning operation is rolled back and all cloned data removed. At this stage, the previously existing data on the recipient has also been removed, which leaves the recipient with no user data.

      Should this scenario occur, you can either rectify the cause of the failure and re-execute the cloning operation, or forgo the cloning operation and restore the recipient data from a backup taken before the cloning operation.

  5. The server is restarted automatically (applies to remote cloning operations that do not clone to a named directory). During startup, typical server startup tasks are performed.

    • If the automatic server restart fails, you can restart the server manually to complete the cloning operation.

If a network error occurs during a cloning operation, the operation resumes if the error is resolved within five minutes. Otherwise, the operation aborts and returns an error.


Rechercher dans le manuel MySQL

Traduction non disponible

Le manuel MySQL n'est pas encore traduit en français sur l'infobrol. Seule la version anglaise est disponible pour l'instant.

Document créé le 26/06/2006, dernière modification le 26/10/2018
Source du document imprimé : https://www.gaudry.be/mysql-rf-clone-plugin-failure-handling.html

L'infobrol est un site personnel dont le contenu n'engage que moi. Le texte est mis à disposition sous licence CreativeCommons(BY-NC-SA). Plus d'info sur les conditions d'utilisation et sur l'auteur.

Références

  1. Consulter le document html Langue du document :en Manuel MySQL : https://dev.mysql.com/

Ces références et liens indiquent des documents consultés lors de la rédaction de cette page, ou qui peuvent apporter un complément d'information, mais les auteurs de ces sources ne peuvent être tenus responsables du contenu de cette page.
L'auteur de ce site est seul responsable de la manière dont sont présentés ici les différents concepts, et des libertés qui sont prises avec les ouvrages de référence. N'oubliez pas que vous devez croiser les informations de sources multiples afin de diminuer les risques d'erreurs.

Table des matières Haut