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tieredstorage:partition-migrate

tieredstorage:partition-migrate(
   $database-id as xs:unsignedLong,
   $partition-name as xs:string,
   $host-ids as xs:unsignedLong*,
   [$data-directory as xs:string?],
   [$large-data-directory as xs:string?],
   [$fast-data-directory as xs:string?],
   [$options as xs:string*]
) as empty-sequence()

Summary

This function migrates all forests in a partition to the specified data directory and hosts. For details, see Migrating Forests and Partitions in the Administrator's Guide.

Parameters
$database-id ID of the database in which the partition will reside.
$partition-name Name of the partition.
$host-ids Ids of hosts on which the forests in the partition will be migrated to.
$data-directory The optional data directory of the forest. If no directory is specified, then it will be a private forest.
$large-data-directory The optional directory where large objects are stored. If no directory is specified, then large objects will be stored in DATA_DIR/Forests/FOREST_NAME/Large.
$fast-data-directory The optional directory for the fast data directory for this forest. The fast data directory is typically located on a fast storage device, such as an SSD.
$options Valid option values include:
timeout=N
Specifies the number of seconds to wait for a forest to re-open after a configuration is made during the migration operation.
local-to-local
Indicates that the migration is between local storage to local storage. This is the default when no other direction parameter is specified and the type of storage cannot be derived from either the data directory path.
local-to-shared
Indicates that the migration is between local storage and shared storage. This type of migration supports changing the host.
shared-to-local
Indicates that the migration is to move data from shared storage to local storage. This type of migration supports changing the host.
shared-to-shared
Indicates that the migration is to move data from shared storage to shared storage. This type of migration supports changing the host.
failover=[local, shared, none]
If failover is set to local and multiple hosts are specified, any existing replica forests will be migrated and new replica forests will be created, if no replica forests exist.

Shared disk failover will be set up if failover is specified to be shared and multiple hosts are specified. The failover hosts will be chosen to cover as many different zones as possible.

If failover is specified to be none, any existing replica forests will be deleted.

If failover is left unspecified, and if local-disk failover is configured, and if the data is being migrated to shared storage, the local disk replicas will be removed, and shared-disk failover will be configured. If shared-disk failover is configured and if the data is being migrated from shared storage to local storage, local- disk failover will replace shared-disk failover. In all other scenarios, the failover policy will be left unchanged when not specified.

replicas=N
Specifies the number of replicas/failover hosts to maintain if failover.

Example

xquery version "1.0-ml";
import module namespace ts="http://marklogic.com/xdmp/tieredstorage" 
          at "/MarkLogic/tieredstorage.xqy";

ts:partition-migrate(xdmp:database("Documents"),"2012-April",xdmp:host(),"/space/ts/")
 
(: Migrates all forests in the "2012-April" partition to the "/space/ts/" data directory 
   on the local host. :)
  

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