O Database Migration Service permite migrar dados para uma instância de destino do Cloud SQL e configurar réplicas de leitura em cascata para essa instância.
As réplicas de leitura em cascata
permitem criar uma réplica de leitura sob uma réplica de leitura do Cloud SQL na mesma região ou
em uma região diferente antes de promover a instância para a principal. É possível adicionar até quatro
níveis de réplicas de leitura em cascata, incluindo a instância principal.
Aguarde até que a fase de despejo completo do job seja concluída e o job de migração
entre na fase captura de dados alterados (CDC). O job de migração está na fase de CDC
quando a coluna Status na página Jobs de migração indica um substatus de CDC.
Na fase de CDC, você pode configurar a réplica de leitura em cascata. Para
informações sobre como criar réplicas de leitura em cascata para uma instância de destino do Cloud SQL, consulte Configurar uma réplica em cascata.
É possível promover a réplica do Cloud SQL para a instância principal usando o Database Migration Service.
Para informações sobre como promover uma instância de destino, consulte
Promover uma migração.
Quando você promove a réplica do Cloud SQL para uma instância principal, a hierarquia de réplicas em cascata
da réplica é retida.
[[["Fácil de entender","easyToUnderstand","thumb-up"],["Meu problema foi resolvido","solvedMyProblem","thumb-up"],["Outro","otherUp","thumb-up"]],[["Difícil de entender","hardToUnderstand","thumb-down"],["Informações incorretas ou exemplo de código","incorrectInformationOrSampleCode","thumb-down"],["Não contém as informações/amostras de que eu preciso","missingTheInformationSamplesINeed","thumb-down"],["Problema na tradução","translationIssue","thumb-down"],["Outro","otherDown","thumb-down"]],["Última atualização 2025-09-05 UTC."],[[["\u003cp\u003eDatabase Migration Service enables the migration of data to a Cloud SQL destination instance, with the ability to set up cascading read replicas.\u003c/p\u003e\n"],["\u003cp\u003eCascading read replicas allow the creation of a read replica under another Cloud SQL read replica, supporting up to four levels, including the primary instance.\u003c/p\u003e\n"],["\u003cp\u003eTo use cascading read replicas, you need to set \u003ccode\u003eGTID_MODE\u003c/code\u003e to \u003ccode\u003eON\u003c/code\u003e on the source instance, as it is only supported for global transaction identifier (GTID)-based replication.\u003c/p\u003e\n"],["\u003cp\u003eCascading read replicas can be set up once the migration job enters the change data capture (CDC) phase, after the initial full data dump.\u003c/p\u003e\n"],["\u003cp\u003ePromoting the Cloud SQL replica to a primary instance via the Database Migration Service maintains the existing cascading replica hierarchy.\u003c/p\u003e\n"]]],[],null,["# Set up cascading read replicas for a Cloud SQL destination instance\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\nMySQL \\| [PostgreSQL](/database-migration/docs/postgres/set-up-cascading-replica \"View this page for the PostgreSQL version of Database Migration Service.\") \\| PostgreSQL to AlloyDB\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\nOverview\n--------\n\nDatabase Migration Service lets you migrate data to a Cloud SQL destination instance,\nand then set up cascading read replicas for that instance.\n\n[Cascading read replicas](/sql/docs/mysql/replication#cascading-replicas)\nlet you create a read replica under a Cloud SQL read replica in the same or\ndifferent region before promoting your instance to primary. You can add up to four\nlevels of cascading read replicas, including the primary instance.\nCascading read replicas in Cloud SQL for MySQL are supported only for [global transaction identifier (GTID)-based replication](https://dev.mysql.com/doc/mysql-replication-excerpt/8.0/en/replication-gtids-concepts.html). If you want to use cascading read replicas in your migration, set `GTID_MODE` to `ON` on your source instance.\n\nSet up cascading read replicas\n------------------------------\n\nTo migrate your data to a Cloud SQL destination that is using cascading read\nreplicas:\n\n1. Set up and start your migration job. For more information, see\n [Create a migration job](/database-migration/docs/mysql/create-migration-job).\n\n2. Wait until the full dump phase of the job completes and the migration job\n enters the change data capture (CDC) phase. Your migration job is in the CDC\n phase when the **Status** column in the **Migration jobs** page indicates a *CDC*\n substatus.\n\n3. Once in the CDC phase, you can set up your cascading read replica. For\n information about how to create cascading read replicas for a Cloud SQL destination\n instance, see [Set up a cascading replica](/sql/docs/mysql/replication/configure-replication-from-external#set_up_a_cascading_replica).\n\n4. You can promote your Cloud SQL replica to primary instance using Database Migration Service.\n For information about promoting a destination instance, see\n [Promote a migration](/database-migration/docs/mysql/promote-migration).\n\nWhen you promote the Cloud SQL replica to a primary instance, the replica's cascading\nreplica hierarchy is retained."]]