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+---
+title: Multi Tenant Migrations
+description: Importing multiple tenant databases into a single Vitess cluster
+weight: 120
+aliases: [ '/docs/reference/vreplication/v2/multitenant-migrations/' ]
+---
+
+## Description
+
+{{< warning >}}
+This feature is an **experimental** variant of
+the [`MoveTables`](../../../reference/programs/vtctldclient/vtctldclient_movetables/) command that
+allows you to migrate from a multi-tenant architecture, with one database per tenant, into a single Vitess cluster.
+Please be sure to understand the limitations and requirements below.
+{{< /warning >}}
+
+The full set of options for the `MoveTables`
+command [can be found here](../../../reference/programs/vtctldclient/vtctldclient_movetables/).
+The options and other aspects specific to multi-tenant migrations will be covered here.
+
+## Use Case
+
+The user has a multi-tenant database architecture. They have several separate MySQL databases, with common schemas,
+one per tenant. This design has several disadvantages, including the need to manage multiple databases, needing to
+update the schema on all databases before the app can start using the new schema, inability to run cross-tenant
+queries, etc.
+
+This system maps well to a sharded Vitess cluster, providing a single logical database where tenants are mapped to
+specific shards.
+
+## Assumptions
+
+- The target keyspace has its schema already initialized.
+- Each table in the target keyspace has a tenant id column with the same name and type on both source and target, and it
+  should be part of the primary key of each table.
+- If the target keyspace is sharded, the vindex should be a multicolumn vindex with the tenant id column
+  as the first column.
+
+## Design
+
+### VSchema 
+A new vschema object is required which defines the column name which defines the tenant id.  The actual tenant id is
+specified for each migration. It should be added at the root level (like `tables`, `vindexes`)
+```
+"multi_tenant_spec": {
+"tenant_id_column_name": "app_id",
+"tenant_id_column_type": "INT64"
+}
+```
+
+
+## Key Parameter
+
+#### --source-shards
+
+**mandatory** (for shard level migrations)
+<div class="cmd">
+
+A list of one or more shards that you want to migrate from the source keyspace
+to the target keyspace.
+
+</div>
+
+## Sample Flow
+
+### Create unmanaged keyspace
+
+Create a source keyspace, say `import_1234` with unmanaged tablets pointing to one tenant's database, whose tenant 
+id is 1234. (https://vitess.io/docs/user-guides/configuration-advanced/unmanaged-tablet/)
+
+
+### Create MoveTables Workflow
+
+`MoveTables --workflow=wf_1234 --target-keyspace=vitess_sharded Create --source-keyspace=import_1234 --all-tables --tenant-id=1234`
+
+Like other vreplication workflows, once this workflow starts, it will first run the Copy phase. Once it is in the 
+Running phase with a low VReplication lag, ideally a second or so, you can switch traffic.
+
+### Monitor Workflow
+
+`Workflow --keyspace=vitess_sharded Show –workflow=wf_1234 --include-logs=false`
+
+### Switch Traffic
+
+`MoveTables --workflow=wf_1234 --target-keyspace=vitess_sharded SwitchTraffic`
+
+### Complete Workflow
+
+`MoveTables --workflow=wf_1234 --target-keyspace=vitess_sharded Complete`
+
+### Migrate all tenants
+
+Multiple tenants can be migrated concurrently. Note that previously migrated tenants will be pointing to the Vitess 
+cluster for their production load. So you may want to limit the concurrency so that the imports are not impacting 
+live performance.
+
+When all tenants have been imported the migration will be complete and once you are satisfied with the behaviour of 
+the Vitess cluster, you can turn off your existing database setup.
+
+Note that, as tenants get migrated, you will have some tenants served by Vitess and others by the existing database 
+cluster. A mechanism will be needed for the app to cutover the migrated tenant by pointing the database connection 
+to the Vitess cluster.
+
+## Reverse Replication
+
+While reverse replication will run after SwitchTraffic, we cannot run a ReverseTraffic for multi-tenant migrations. 
+This is because we cannot stop writes on the target, which will have live traffic for several other tenants.
+Currently, for reversing we will need to perform, several manual reverse steps:
+* manually switch the routing in the app to point to the existing database for the tenant
+* delete the data from the target for that tenant manually
+* drop the external keyspace 
+* delete related keyspace routing rules (https://vitess.io/docs/20.0/reference/programs/vtctldclient/vtctldclient_applykeyspaceroutingrules/)
+* delete the vreplication workflow
+
+
+## Optimizations
+The `MoveTables` and `Workflow` commands now take an additional --shards parameter. This ensures that these commands 
+only communicate with the primary of that shard instead of all shards. It is strongly recommended to provide this 
+while working with large number of shards (say 32 and above), while working with multi-tenant migrations.
+
+Usually a tenant will be mapped to very few shards, (probably one for smaller tenants). If `--shards` is not specified
+then these commands will unnecessarily contact the remaining shards. For larger number of shards this can take 
+several seconds and indeed `SwitchTraffic` might end up timing out.
+
+Note that an incorrect shard naming can result in an incorrect migration or reporting of an incorrect status. So you 
+would build in some automation if you intend to use it. 
+
+One way of finding out the shard to which a tenant will be mapped is by running this query in vtgate:
+`select shard from <your_vindex_name> where id = <tenant_id>;`
+
+