RESTORE DATABASE

Restores a database from a binary backup file.

Refer to Back Up and Restore Data for additional information.

Syntax

Restore From S3

RESTORE [DATABASE] <database_name> FROM S3 "bucket/path"
[CONFIG <configuration_json>]
CREDENTIALS <credentials_json>
[WITH FILE = incr_backup_id]
[sync_options]
[(OPTION resource_pool = resource_pool_name)]
<configuration_json>:
'{"region":"your_region",
"endpoint_url":"http://other_endpoint"
[, "x-amz-server-side-encryption-customer-algorithm":"<encryption_type>",
"x-amz-server-side-encryption-customer-key":"<encrypted_or_unencrypted_key>",
"x-amz-server-side-encryption-customer-key-MD5":"<key>"
]
}'
<credentials_json>:
'{"aws_access_key_id": "replace_with_your_access_key_id",
"aws_secret_access_key": "replace_with_your_secret_access_key",
["aws_session_token": "replace_with_your_temp_session_token",]
["role_arn":"replace_with_your_role_arn"]
}'
sync_options:
WITH {SYNC | ASYNC} DURABILITY
| WITH {SYNC | ASYNC} REPLICATION
| WITH {SYNC | ASYNC} DURABILITY {SYNC | ASYNC} REPLICATION

Restore From an S3 Compatible Storage Provider

RESTORE [DATABASE] <database_name> [AS <new_db_name>]
FROM S3 "bucket/path"
[CONFIG <configuration_json>]
CREDENTIALS <credentials_json>
[WITH FILE = incr_backup_id]
[sync_options]
[(OPTION resource_pool = resource_pool_name)]
<configuration_json>:
'{"endpoint_url":"http://storage_provider_endpoint"}'
<credentials_json>:
'{"aws_access_key_id": "replace_with_your_access_key_id",
"aws_secret_access_key": "replace_with_your_secret_access_key"
}'
sync_options:
WITH {SYNC | ASYNC} DURABILITY
| WITH {SYNC | ASYNC} REPLICATION
| WITH {SYNC | ASYNC} DURABILITY {SYNC | ASYNC} REPLICATION

Restore From Google Cloud Storage

RESTORE [DATABASE] <database_name> [AS <new_db_name>]
FROM GCS "bucket/path"
[CONFIG <configuration_json>]
CREDENTIALS <credentials_json>
[WITH FILE = incr_backup_id]
[sync_options] [
(OPTION resource_pool = resource_pool_name)]
<configuration_json>:
'{}'
<credentials_json>:
'{"access_id": "replace_with_your_google_access_key",
"secret_key": "replace_with_your_google_secret_key"
}'
sync_options:
WITH {SYNC | ASYNC} DURABILITY
| WITH {SYNC | ASYNC} REPLICATION
| WITH {SYNC | ASYNC} DURABILITY {SYNC | ASYNC} REPLICATION

See the remarks for details on the aws_access_key_id and aws_secret_access_key.

Restore from Azure blobs

RESTORE [DATABASE] <database_name> [AS <new_db_name>]
FROM AZURE "container/blob-prefix"
CREDENTIALS <credentials_json>
[CONFIG <configuration_json>]
[WITH FILE = incr_backup_id]
[sync_options]
[(OPTION resource_pool = resource_pool_name)]
<credentials json>:
'{"account_name": "your_account_name_here",
"account_key": "your_account_key_here"
}'
sync_options:
WITH {SYNC | ASYNC} DURABILITY
| WITH {SYNC | ASYNC} REPLICATION
| WITH {SYNC | ASYNC} DURABILITY {SYNC | ASYNC} REPLICATION
RESTORE [DATABASE] <database_name> [AS <new_db_name>]
FROM LINK [link_database_name.]connection_name "backup_path";

Arguments

  • <database_name> is the SingleStore database to restore to. The restored database always has the same number of partitions as the original database that you backed up.

  • link_database_name is the database that stores the connection link connection_name.

  • If you wish to restore the backup of one database into a differently-named database, you can do so by specifying the path for S3 or prefix-key for Azure blobs. See the Examples section for examples.

  • WITH {SYNC | ASYNC} REPLICATION specifies, following the database restore, whether high availability, redundancy-2 replication will be done synchronously or asynchronously. Synchronous replication from the master partitions will complete on all replicas before the commit of the transaction is acknowledged to the client application. If {SYNC | ASYNC} REPLICATION is not specified, the replication setting from the database specified in the backup_path or bucket/path, or container/blob-prefix is used.

  • WITH {SYNC | ASYNC} DURABILITY specifies, following the database restore, whether in-memory database updates you make using DDL and DML commands are also saved to the log on disk synchronously or asynchronously. Synchronous updates to the log on disk will complete before the commit of the transaction is acknowledged to the client application. If WITH {SYNC | ASYNC} DURABILITY is not specified, the durability setting from the database specified in the backup_path or bucket/path, or container/blob-prefix is used.

  • You cannot specify WITH SYNC DURABILITY ASYNC REPLICATION.

  • [WITH FILE = incr_backup_id] restores an incremental backup with the incr_backup_id that was assigned to the backup when it was taken.

  • ON WORKSPACE <workspace name> specifies the workspace to which to restore the database.

    When RESTORE DATABASE is run on a child aggregator (that is part of a workspace), the ON WORKSPACE syntax is not necessary. The database is restored to the workspace of the child aggregator automatically. When restoring on the MA directly (i.e., using the DDL endpoint in SingleStore Helios) use ON WORKSPACE to specify the workspace to restore to.

Remarks

  • The RESTORE command replays a binary backup file in the same manner in which SingleStore Helios recovers a database snapshot during startup.

  • CONFIG and CREDENTIALS can be specified in either order (CONFIG followed by CREDENTIALS or CREDENTIALS followed by CONFIG).For configuration examples refer BACKUP DATABASE

  • A RESTORE operation temporarily puts the database being restored into the recovering snapshot state. A database in this state cannot be queried. When the RESTORE command finishes, it puts the database into the online state. See Database for more information.

  • This command causes implicit commits. Refer to COMMIT for more information.

  • You can restore to S3, Azure, or GCS using a connection link. However, you require the SHOW LINK permission, provided by your administrator, to use a connection link.

  • Refer to the Permission Matrix for the required permission.

Warning

SingleStore does not support restoring database backups from a newer version of SingleStore into an older version.

Restore from S3

  • aws_session_token is optional. This is only needed if your AWS account uses the AWS Security Token Service.

  • role_arn is optional. This is only needed if your AWS security is set up to require a role. The role needs to be alive for the entire restore process and will result in an assume_role on every S3 API call.

  • endpoint_url is optional.

  • You should not specify the compatibility_mode setting, as you would when restoring from Google Cloud Storage using the S3 interface.

  • As an alternative to using a RESTORE ... FROM S3 statement where you specify the CONFIG and CREDENTIALS clauses, you can use the RESTORE ... FROM LINK statement, where you reference a connection link. For more information, see Configuring and Using Connection Links.

  • You can restore a database to an HTTPS S3 target with an unverified SSL certificate by using the option: CONFIG '{"verify_ssl": false}' .

Restore From an S3-Compatible Storage Provider

  • RESTORE ... FROM S3 with the endpoint_url set to the URL of the S3 compatible storage provider restores an S3 compatible backup from the storage provider.

  • aws_access_key_id is optional. It is the access key id for accessing the storage provider.

  • aws_secret_access_key is optional. It is the secret access key for accessing the storage provider.

  • You should not specify the compatibility_mode setting, as you would when restoring from Google Cloud Storage using the S3 interface.

  • As an alternative to using a RESTORE ... FROM S3 statement where you specify the CONFIG and CREDENTIALS clauses, you can use the RESTORE ... FROM LINK statement, where you reference a connection link. For more information, see Configuring and Using Connection Links.

Restore From Google Cloud Storage

  • The CONFIG clause may optionally specify an endpoint_url.

  • The CREDENTIALS clause is required

  • We support only HMAC keys

  • The CREDENTIALS clause should be a JSON object with two fields:

access_id: usually a 24 or 60 character alphanumeric string, which is linked to the Google account, typically all uppercase and starts with GOOG.

secret_key: usually a 40 character Base-64 encoded string that is linked to a specific access_id.

As an alternative to using a RESTORE ... FROM GCS statement where you specify the CONFIG and CREDENTIALS clauses, you can use the RESTORE ... FROM LINK statement, where you reference a connection link. For more information, see Configuring and Using Connection Links.

Restore from Azure

  • The time limit given to download a file from Azure is 30 minutes. This should be sufficient for most files at most download speeds. If that is not sufficient to download a file, you may get an error saying truncated tar archive, in which case you may want to check your connection and retry the operation.

  • As an alternative to using a RESTORE ... FROM AZURE statement where you specify the CONFIG clause, you can use the RESTORE ... FROM LINK statement, where you reference a connection link. For more information, see Configuring and Using Connection Links.

  • The RESTORE.. FROM LINK command restores a database from the specified container using a connection link. To use this command, you only need to know the connection link name, not the connection details and configuration.

  • This command supports S3, Azure, and GCS connections only.

Examples

Restore from S3

The following example restores from an S3 bucket.

RESTORE DATABASE memsql_demo FROM S3 "backup_bucket/backups/6_1_2018"
CONFIG '{"region":"us-east-1"}'
CREDENTIALS '{"aws_access_key_id":"replace_with_your_access_key_id","aws_secret_access_key":"replace_with_your_secret_access_key"}';

The following example restores a database(memsql_demo) from an S3 bucket to a database with a different name(new_memsql_demo).

RESTORE DATABASE new_memsql_demo FROM S3 "backup_bucket/backups/6_1_2018/memsql_demo.backup"
CONFIG '{"region":"us-east-1"}'
CREDENTIALS '{"aws_access_key_id":"replace_with_your_access_key_id","aws_secret_access_key":"replace_with_your_secret_access_key"}';

The following example demonstrates the CONFIG clause for restoring from SSE-C encrypted buckets.

--- For Server-Side Encryption with Customer-Provided Encryption Keys (SSE-C) ---
CONFIG '{"region":"us-east-1", "endpoint_url":"<target_endpoint_url>",
"x-amz-server-side-encryption-customer-algorithm":"AES256",
"x-amz-server-side-encryption-customer-key":"<key>",
"x-amz-server-side-encryption-customer-key-MD5":"<key>"}'

The following example restores a database from an S3 bucket to a the test-workspace workspace.

RESTORE DATABASE test FROM S3 'path_to/mybucket/db.backup'
CONFIG '{"region":"us-west-2","endpoint-url":"https://s3.amazonaws.com"}'
CREDENTIALS '{"aws_access_key_id" : "replace_with_your_access_key_id","aws_secret_access_key":"replace_with_your_secret_access_key"}'
ON WORKSPACE test-workspace;

Restore From Google Cloud Storage using the S3 Interface

The following example uses the S3 interface to restore from a Google Cloud Storage bucket.

RESTORE DATABASE memsql_demo FROM S3 "backup_bucket/backups/12_15_2019"
CONFIG '{"compatibility_mode":true,"endpoint_url":"https://storage.googleapis.com"}'
CREDENTIALS '{"aws_access_key_id":"replace_with_your_google_access_key","aws_secret_access_key":"replace_with_your_google_secret_key"}';

Restore from Azure

The following example restores from an Azure Container.

RESTORE DATABASE memsql_demo FROM AZURE "backup_container/backups/6_1_2018" CREDENTIALS '{"account_name":"your_account_name_here","account_key": "your_account_key_here"}';

The following example restores a database(memsql_demo) from an Azure container to a database with a different name(new_memsql_demo).

RESTORE DATABASE new_memsql_demo FROM AZURE "backup_container/backups/6_1_2018/memsql_demo.backup" CREDENTIALS '{"account_name":"your_account_name_here","account_key": "your_account_key_here"}';

Restore Using a Resource Pool

The following example restores a database from /my-backup-dir, using an existing resource pool, general.

RESTORE DATABASE memsql_demo FROM "/my-backup-dir" (OPTION resource_pool = general);

The following example restores the database db1, from the bucket at the specified path, using an S3 connection link S3_link stored in the database db2. Ensure that the connection link S3_link already exists in db2. Refer to CREATE_LINK for details on creating a connection link.

RESTORE DATABASE db1 FROM LINK db2.S3_link "backup_path/backups/6_1_2020"

Note: db1 is the database to be restored while db2 is the database of the connection link S3_link.

Common Errors

A common error is giving incorrect paths to the backup files to restore command. The path that you give to the RESTORE command should match the path that you gave to the BACKUP command, unless you are restoring to a database with a different name in S3 or Azure restore, in which case, /old_database_name.backup should be appended to your restore path.

Last modified: March 12, 2024

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