CREATE FAILOVER GROUP¶

Syntax¶

CREATE FAILOVER GROUP [ IF NOT EXISTS ] <name>
    OBJECT_TYPES = <object_type> [ , <object_type> , ... ]
    [ ALLOWED_DATABASES = <db_name> [ , <db_name> , ... ] ]
    [ ALLOWED_SHARES = <share_name> [ , <share_name> , ... ] ]
    [ ALLOWED_INTEGRATION_TYPES = <integration_type_name> [ , <integration_type_name> , ... ] ]
    ALLOWED_ACCOUNTS = <org_name>.<target_account_name> [ , <org_name>.<target_account_name> ,  ... ]
    [ IGNORE EDITION CHECK ]
    [ REPLICATION_SCHEDULE = '{ <num> MINUTE | USING CRON <expr> <time_zone> }' ]
    [ [ WITH ] TAG ( <tag_name> = '<tag_value>' [ , <tag_name> = '<tag_value>' , ... ] ) ]
    [ ERROR_INTEGRATION = <integration_name> ]

Secondary Failover Group

CREATE FAILOVER GROUP [ IF NOT EXISTS ] <secondary_name>
    AS REPLICA OF <org_name>.<source_account_name>.<name>

Parameters¶

name

Specifies the identifier for the failover group. The identifier must start with an alphabetic character and cannot contain spaces or special characters unless the identifier string is enclosed in double quotes (e.g. "My object"). Identifiers enclosed in double quotes are also case-sensitive.

For more details, see Identifier requirements.

OBJECT_TYPES = object_type [ , object_type , ... ]

Type(s) of objects for which you are enabling replication and failover from the source account to the target account.

The following object types are supported:

ACCOUNT PARAMETERS:

All account-level parameters. This includes account parameters and parameters that can be set for your account.

DATABASES:

Add database objects to the list of object types. If database objects are included in the list of specified object types, the ALLOWED_DATABASES parameter must be set.

INTEGRATIONS:

Currently, only security, API, storage, external access, and certain types of notification integrations are supported. For details, see Integration replication.

If integration objects are included in the list of specified object types, the ALLOWED_INTEGRATION_TYPES parameter must be set.

NETWORK POLICIES:

All network policies in the source account.

RESOURCE MONITORS:

All resource monitors in the source account.

ROLES:

All roles in the source account. Replicating roles implicitly includes all grants for object types included in the replication group. For example, if ROLES is the only object type that is replicated, then only hierarchies of roles (i.e. roles granted to other roles) are replicated to target accounts. If the USERS object type is also included, then role grants to users are also replicated.

SHARES:

Add share objects to the list of object types. If share objects are included in the list of specified object types, the ALLOWED_SHARES parameter must be set.

USERS:

All users in the source account.

WAREHOUSES:

All warehouses in the source account.

To modify the list of replicated object types to a specified target account, use ALTER FAILOVER GROUP to reset the list of object types.

ALLOWED_DATABASES = db_name [ , db_name , ... ]

Specifies the database or list of databases for which you are enabling replication and failover from the source account to the target account. In order for you to set this parameter, the OBJECT_TYPES list must include DATABASES.

db_name

Specifies the identifier for the database.

ALLOWED_SHARES = share_name [ , share_name , ... ]

Specifies the share or list of shares for which you are enabling replication and failover from the source account to the target account. In order for you to set this parameter, the OBJECT_TYPES list must include SHARES.

share_name

Specifies the identifier for the share.

ALLOWED_INTEGRATION_TYPES = integration_type_name [ , integration_type_name , ... ]

Type(s) of integrations for which you are enabling replication and failover from the source account to the target account.

This property requires that the OBJECT_TYPES list include INTEGRATIONS to set this parameter.

The following integration types are supported:

SECURITY INTEGRATIONS:

Specifies security integrations.

This property requires that the OBJECT_TYPES list include ROLES.

API INTEGRATIONS:

Specifies API integrations.

API integration replication requires additional set up after the API integration is replicated to the target account. For more information, see Updating the remote service for API integrations.

STORAGE INTEGRATIONS:

Specifies storage integrations.

EXTERNAL ACCESS INTEGRATIONS:

Specifies external access integrations.

For more information, see Replication of stored procedures and user-defined functions (UDFs).

NOTIFICATION INTEGRATIONS:

Specifies notification integrations.

Only some types of notification integrations are replicated. For details, see Integration replication.

ALLOWED_ACCOUNTS = org_name.target_account_name [ , org_name.target_account_name , ... ]

Specifies the target account or list of target accounts to which replication and failover of specified objects from the source account is enabled. Secondary failover groups in the target accounts in this list can be promoted to serve as the primary failover group in case of failover.

org_name

Name of your Snowflake organization.

target_account_name

Target account to which you are enabling replication of the specified objects.

IGNORE EDITION CHECK

Allows replicating objects to accounts in the following scenario:

The primary failover group is in a Business Critical (or higher) account and a signed business associate agreement is in place to store PHI data in the account per HIPAA and HITRUST regulations. However, no such agreement is in place for one or more of the accounts approved for replication, regardless if they are Business Critical (or higher) accounts.

This scenario is prohibited by default.

REPLICATION_SCHEDULE ...

Specifies the schedule for refreshing secondary failover groups.

• USING CRON expr time_zone

  Specifies a cron expression and time zone for the secondary group refresh. Supports a subset of standard cron utility syntax.

  For a list of time zones, see the list of tz database time zones (in Wikipedia).

  The cron expression consists of the following fields:

  # __________ minute (0-59)
  # | ________ hour (0-23)
  # | | ______ day of month (1-31, or L)
  # | | | ____ month (1-12, JAN-DEC)
  # | | | | __ day of week (0-6, SUN-SAT, or L)
  # | | | | |
  # | | | | |
    * * * * *
  

  The following special characters are supported:

  *

  Wildcard. Specifies any occurrence of the field.

  L

  Stands for “last”. When used in the day-of-week field, it allows you to specify constructs such as “the last Friday” (“5L”) of a given month. In the day-of-month field, it specifies the last day of the month.

  /n

  Indicates the nth instance of a given unit of time. Each quanta of time is computed independently. For example, if 4/3 is specified in the month field, then the refresh is scheduled for April, July and October (i.e. every 3 months, starting with the 4th month of the year). The same schedule is maintained in subsequent years. That is, the refresh is not scheduled to run in January (3 months after the October run).

  Note

  • The cron expression currently evaluates against the specified time zone only. Altering the TIMEZONE parameter value for the account (or setting the value at the user or session level) does not change the time zone for the refresh.

  • The cron expression defines all valid run times for the refresh. Snowflake attempts to refresh secondary groups based on this schedule; however, any valid run time is skipped if a previous run has not completed before the next valid run time starts.

  • When both a specific day of month and day of week are included in the cron expression, then the refresh is scheduled on days satisfying either the day of month or day of week. For example, SCHEDULE = 'USING CRON 0 0 10-20 * TUE,THU UTC' schedules a refresh at 0AM on any 10th to 20th day of the month and also on any Tuesday or Thursday outside of those dates.

• num MINUTE

  Specifies an interval (in minutes) of wait time between refreshes. Accepts positive integers only.

  Also supports num M syntax.

  To avoid ambiguity, a base interval time is set:

  • When the object is created (using CREATE <object>) or

  • When a different interval is set (using ALTER <object> … SET REPLICATION_SCHEDULE)

  The base interval time starts the interval counter from the current clock time. For example, if an INTERVAL value of 10 is set and the scheduled refresh is enabled at 9:03 AM, then the refresh runs at 9:13 AM, 9:23 AM, and so on. Note that we make a best effort to ensure absolute precision, but only guarantee that refreshes do not execute before their set interval occurs (e.g. in the current example, the refresh could first run at 9:14 AM, but will definitely not run at 9:12 AM).

  Note

  The maximum supported value is 11520 (8 days). If the replication schedule has a greater num MINUTE value, the refresh operation never runs.

TAG ( tag_name = 'tag_value' [ , tag_name = 'tag_value' , ... ] )

Specifies the tag name and the tag string value.

The tag value is always a string, and the maximum number of characters for the tag value is 256.

For information about specifying tags in a statement, see Tag quotas for objects and columns.

ERROR_INTEGRATION = integration_name

Specifies the name of the notification integration to use to send notifications when refresh errors occur for the failover group. For more details, see Error notifications for replication and failover groups.

Secondary Failover Group Parameters

secondary_name

Specifies the identifier for the secondary failover group. The identifier must start with an alphabetic character and cannot contain spaces or special characters unless the identifier string is enclosed in double quotes (e.g. "My object"). Identifiers enclosed in double quotes are also case-sensitive. For more details, see Identifier requirements.

The identifiers for the secondary failover group (secondary_name) and primary failover group (name) can be, but are not required to be, identical.

AS REPLICA OF org_name.source_account_name.name

Specifies the identifier of the primary failover group from which to create a secondary failover group.

org_name

Name of your Snowflake organization.

source_account_name

Source account from which you are enabling replication and failover of the specified objects.

name

Identifier for the primary failover group in the source account.

Access control requirements¶

A role used to execute this SQL command must have the following privileges at a minimum:

For instructions on creating a custom role with a specified set of privileges, see Creating custom roles.

For general information about roles and privilege grants for performing SQL actions on securable objects, see Overview of Access Control.

Usage notes¶

• Identifiers for failover groups and replication groups in an account must be unique.

• Objects other than databases and shares must be in the same failover group.

• A database can only be added to one failover group.

• Inbound shares (shares from providers) cannot be added to a replication or failover group.

• To retrieve the set of accounts in your organization that are enabled for replication, use SHOW REPLICATION ACCOUNTS.

• To retrieve the list of failover groups in your organization, use SHOW FAILOVER GROUPS.

• If there are account objects (e.g. users or roles) in a target account that you do not want to drop during replication, use the SYSTEM$LINK_ACCOUNT_OBJECTS_BY_NAME system function to apply a global identifier to objects created by means other than replication. For more information, see Apply Global IDs to Objects Created by Scripts in Target Accounts before you create a failover group.

• Automatically scheduled refresh operations are executed using the role with the OWNERSHIP privilege on the group. If a scheduled refresh operation fails due to insufficient privileges, grant the required privileges to the role with the OWNERSHIP privilege on the group.

• If you create a replication or failover group with a tag or modify a replication or failover group by setting a tag on it, tag lineage does not apply to any objects that you specify in the replication or failover group.

  Tag lineage is only applicable to objects with a parent-child relationship, such database, schema, and table. There are no child objects of replication or failover groups.

• You cannot set a tag or modify a tag on a secondary replication or failover group because these objects are read only.

• When you refresh a secondary replication or failover group, any tags that are set on the primary group are then set on the secondary group.

• Regarding metadata:

  Attention

  Customers should ensure that no personal data (other than for a User object), sensitive data, export-controlled data, or other regulated data is entered as metadata when using the Snowflake service. For more information, see Metadata fields in Snowflake.

• For an account that is newly upgraded to Business Critical Edition (or higher), it might take up to 12 hours for failover capabilities to become available.

Examples¶

CREATE FAILOVER GROUP myfg
    OBJECT_TYPES = DATABASES
    ALLOWED_DATABASES = db1
    ALLOWED_ACCOUNTS = myorg.myaccount2
    REPLICATION_SCHEDULE = '10 MINUTE';

CREATE FAILOVER GROUP myfg
    AS REPLICA OF myorg.myaccount1.myfg;

CREATE FAILOVER GROUP myfg
    OBJECT_TYPES = DATABASES
    ALLOWED_DATABASES = db1, db2, db3
    ALLOWED_ACCOUNTS = myorg.myaccount2
    REPLICATION_SCHEDULE = '10 MINUTE';

CREATE FAILOVER GROUP myfg
    AS REPLICA OF myorg.myaccount1.myfg;

CREATE FAILOVER GROUP myfg
    OBJECT_TYPES = USERS, ROLES, WAREHOUSES, RESOURCE MONITORS, INTEGRATIONS
    ALLOWED_INTEGRATION_TYPES = STORAGE INTEGRATIONS, NOTIFICATION INTEGRATIONS
    ALLOWED_ACCOUNTS = myorg.myaccount2
    REPLICATION_SCHEDULE = '10 MINUTE';

CREATE FAILOVER GROUP myfg
    AS REPLICA OF myorg.myaccount1.myfg;