MIGRATE

Syntax text Syntax diagram API methods

MIGRATE host port <key | ""> destination-db timeout [COPY] [REPLACE]
  [AUTH password | AUTH2 username password] [KEYS key [key ...]]

Client: Python (redis-py) Node.js (node-redis) Java-Sync (Jedis) Lettuce-Sync Java-Async (Lettuce) Java-Reactive (Lettuce) Go (go-redis) C#-Sync (NRedisStack) C#-Async (NRedisStack) PHP (Predis) Rust-Sync (redis-rs) Rust-Async (redis-rs)

migrate(
    host: str,
    port: int,
    keys: KeysT,
    destination_db: int,
    timeout: int,
    copy: bool,
    replace: bool,
    auth: Optional[str]
) → str

MIGRATE(
    host: string,
    port: number,
    key: RedisArgument,
    destination: number,
    timeout: number,
    options?: MigrateOptions
) → Any

migrate(
    host: String,
    port: int,
    key: byte[],
    destinationDB: int,
    timeout: int
) → String  // Status code reply

migrate(
    host: String,
    port: int,
    destinationDB: int,
    timeout: int,
    params: MigrateParams,
    keys: byte[]...
) → String  // Status code reply

migrate(
    host: String,
    port: int,
    key: String,
    destinationDB: int,
    timeout: int
) → String  // Status code reply

migrate(
    host: String,
    port: int,
    destinationDB: int,
    timeout: int,
    params: MigrateParams,
    keys: String...
) → String  // Status code reply

migrate(
    host: String,  // the host.
    port: int,  // the port.
    key: K,  // the key.
    db: int,  // the database.
    timeout: long  // the timeout.
) → String  // String simple-string-reply The command returns OK on success.

migrate(
    host: String,  // the host.
    port: int,  // the port.
    db: int,  // the database.
    timeout: long,  // the timeout.
    migrateArgs: MigrateArgs<K>  // the migrate arguments.
) → String  // String simple-string-reply The command returns OK on success.

migrate(
    host: String,  // the host.
    port: int,  // the port.
    key: K,  // the key.
    db: int,  // the database.
    timeout: long  // the timeout.
) → RedisFuture<String>  // String simple-string-reply The command returns OK on success.

migrate(
    host: String,  // the host.
    port: int,  // the port.
    db: int,  // the database.
    timeout: long,  // the timeout.
    migrateArgs: MigrateArgs<K>  // the migrate arguments.
) → RedisFuture<String>  // String simple-string-reply The command returns OK on success.

migrate(
    host: String,  // the host.
    port: int,  // the port.
    key: K,  // the key.
    db: int,  // the database.
    timeout: long  // the timeout.
) → Mono<String>  // String simple-string-reply The command returns OK on success.

migrate(
    host: String,  // the host.
    port: int,  // the port.
    db: int,  // the database.
    timeout: long,  // the timeout.
    migrateArgs: MigrateArgs<K>  // the migrate arguments.
) → Mono<String>  // String simple-string-reply The command returns OK on success.

Migrate(
    ctx: context.Context,
    host: string,
    port: int,
    key: string,
    db: int,
    timeout: time.Duration
) → *StatusCmd

KeyMigrate(
    key: RedisKey,  // The key to migrate.
    toServer: EndPoint,  // The destination server.
    toDatabase: int,  // The destination database.
    timeoutMilliseconds: int,  // The timeout in milliseconds.
    migrateOptions: MigrateOptions,  // The migrate options.
    flags: CommandFlags  // The flags to use for this operation.
) → void

KeyMigrateAsync(
    key: RedisKey,  // The key to migrate.
    toServer: EndPoint,  // The destination server.
    toDatabase: int,  // The destination database.
    timeoutMilliseconds: int,  // The timeout in milliseconds.
    migrateOptions: MigrateOptions,  // The migrate options.
    flags: CommandFlags  // The flags to use for this operation.
) → Task

migrate(
    $host: string,
    $port: int,
    $key: string|array,
    $dstdb: int,
    $timeout: int,
    $copy: bool,
    $replace: bool
) → bool

No method signature available for this client.

No method signature available for this client.

Available since:

Redis Open Source 2.6.0

Time complexity:

This command actually executes a DUMP+DEL in the source instance, and a RESTORE in the target instance. See the pages of these commands for time complexity. Also an O(N) data transfer between the two instances is performed.

ACL categories:

@keyspace, @write, @slow, @dangerous,

Compatibility:

Redis Software and Redis Cloud compatibility

Atomically transfer a key from a source Redis instance to a destination Redis instance. On success the key is deleted from the original instance and is guaranteed to exist in the target instance.

The command is atomic and blocks the two instances for the time required to transfer the key, at any given time the key will appear to exist in a given instance or in the other instance, unless a timeout error occurs. In 3.2 and above, multiple keys can be pipelined in a single call to MIGRATE by passing the empty string ("") as key and adding the KEYS clause.

Required arguments

Optional arguments

Details

The command internally uses DUMP to generate the serialized version of the key value, and RESTORE in order to synthesize the key in the target instance. The source instance acts as a client for the target instance. If the target instance returns OK to the RESTORE command, the source instance deletes the key using DEL.

The timeout specifies the maximum idle time in any moment of the communication with the destination instance in milliseconds. This means that the operation does not need to be completed within the specified amount of milliseconds, but that the transfer should make progresses without blocking for more than the specified amount of milliseconds.

MIGRATE needs to perform I/O operations and to honor the specified timeout. When there is an I/O error during the transfer or if the timeout is reached the operation is aborted and the special error - IOERR returned. When this happens the following two cases are possible:

• The key may be on both the instances.
• The key may be only in the source instance.

It is not possible for the key to get lost in the event of a timeout, but the client calling MIGRATE, in the event of a timeout error, should check if the key is also present in the target instance and act accordingly.

When any other error is returned (starting with ERR) MIGRATE guarantees that the key is still only present in the originating instance (unless a key with the same name was also already present on the target instance).

If there are no keys to migrate in the source instance NOKEY is returned. Because missing keys are possible in normal conditions, from expiry for example, NOKEY isn't an error.

Migrating multiple keys with a single command call

Starting with Redis 3.0.6 MIGRATE supports a new bulk-migration mode that uses pipelining in order to migrate multiple keys between instances without incurring in the round trip time latency and other overheads that there are when moving each key with a single MIGRATE call.

In order to enable this form, the KEYS option is used, and the normal key argument is set to an empty string. The actual key names will be provided after the KEYS argument itself, like in the following example:

MIGRATE 192.168.1.34 6379 "" 0 5000 KEYS key1 key2 key3

When this form is used the NOKEY status code is only returned when none of the keys is present in the instance, otherwise the command is executed, even if just a single key exists.

Redis Software and Redis Cloud compatibility

Return information

History

• Starting with Redis version 3.0.0: Added the COPY and REPLACE options.
• Starting with Redis version 3.0.6: Added the KEYS option.
• Starting with Redis version 4.0.7: Added the AUTH option.
• Starting with Redis version 6.0.0: Added the AUTH2 option.