RESTORE feature is only available to enterprise users. For non-enterprise restores, see Restore Data.The RESTORE statement restores your cluster's schemas and data from an enterprise BACKUP stored on a services such as AWS S3, Google Cloud Storage, NFS, or HTTP storage.
Because CockroachDB is designed with high fault tolerance, restores are designed primarily for disaster recovery, i.e., restarting your cluster if it loses a majority of its nodes. Isolated issues (such as small-scale node outages) do not require any intervention.
Functional Details
Restore Targets
You can restore entire tables (which automatically includes their indexes) or views from a backup. This process uses the data stored in the backup to create entirely new tables or views in the target database.
The notion of "restoring a database" simply restores all of the tables and views that belong to the database, but does not create the database. For more information, see Target Database.
RESTORE only offers table-level granularity; it does not support restoring subsets of a table.Because this process is designed for disaster recovery, CockroachDB expects that the tables do not currently exist in the target database. This means the target database must have not have tables or views with the same name as the restored table or view. If any of the restore target's names are being used, you can:
DROP TABLE,DROP VIEW, orDROP SEQUENCEand then restore them. Note that a sequence cannot be dropped while it is being used in a column'sDEFAULTexpression, so those expressions must be dropped before the sequence is dropped, and recreated after the sequence is recreated. Thesetvalfunction can be used to set the value of the sequence to what it was previously.- Restore the table or view into a different database.
Object Dependencies
Dependent objects must be restored at the same time as the objects they depend on.
| Object | Depends On |
|---|---|
| Table with foreign key constraints | The table it REFERENCES (however, this dependency can be removed during the restore). |
| Table with a sequence | The sequence. |
| Views | The tables used in the view's SELECT statement. |
| Interleaved tables | The parent table in the interleaved hierarchy. |
Target Database
By default, tables and views are restored into a database with the name of the database from which they were backed up. However, also consider:
- You can choose to change the target database.
- If it no longer exists, you must create the target database.
The target database must have not have tables or views with the same name as the tables or views you're restoring.
Users and Privileges
Table and view users/privileges are not restored. Restored tables and views instead inherit the privileges of the database into which they're restored.
However, every backup includes system.users, so you can restore users and their passwords.
Table-level privileges must be granted to users after the restore is complete.
Restore Types
You can either restore from a full backup or from a full backup with incremental backups, based on the backup files you include.
| Restore Type | Parameters |
|---|---|
| Full backup | Include only the path to the full backup. |
| Full backup + incremental backups |
Include the path to the full backup as the first argument and the subsequent incremental backups from oldest to newest as the following arguments. |
Point-in-time Restore New in v2.0
If the full or incremental backup was taken with revision history, you can restore the data as it existed at the specified point-in-time within the revision history captured by that backup.
If you do not specify a point-in-time, the data will be restored to the backup timestamp; that is, the restore will work as if the data was backed up without revision history.
Performance
The RESTORE process minimizes its impact to the cluster's performance by distributing work to all nodes. Subsets of the restored data (known as ranges) are evenly distributed among randomly selected nodes, with each range initially restored to only one node. Once the range is restored, the node begins replicating it others.
RESTORE fails or is canceled, partially restored data is properly cleaned up. This can have a minor, temporary impact on cluster performance.Viewing and Controlling Restore Jobs
After CockroachDB successfully initiates a restore, it registers the restore as a job, which you can view with SHOW JOBS.
After the restore has been initiated, you can control it with PAUSE JOB, RESUME JOB, and CANCEL JOB.
Synopsis
Required Privileges
Only the root user can run RESTORE.
Parameters
| Parameter | Description |
|---|---|
table_pattern |
The table or view you want to restore. |
database_name |
The name of the database you want to restore (i.e., restore all tables and views in the database). You can restore an entire database only if you had backed up the entire database. |
full_backup_location |
The URL where the full backup is stored. For information about this URL structure, see Backup File URLs. |
incremental_backup_location |
The URL where an incremental backup is stored. Lists of incremental backups must be sorted from oldest to newest. The newest incremental backup's timestamp must be within the table's garbage collection period. For information about this URL structure, see Backup File URLs. For more information about garbage collection, see Configure Replication Zones. |
AS OF SYSTEM TIME timestamp |
New in v2.0: Restore data as it existed as of timestamp. You can restore point-in-time data only if you had taken full or incremental backup with revision history. |
kv_option_list |
Control your backup's behavior with these options. |
Backup File URLs
The URL for your backup's locations must use the following format:
[scheme]://[host]/[path]?[parameters]
| Location | scheme | host | parameters |
|---|---|---|---|
| Amazon S3 | s3 |
Bucket name | AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY |
| Azure | azure |
Container name | AZURE_ACCOUNT_KEY, AZURE_ACCOUNT_NAME |
| Google Cloud 1 | gs |
Bucket name | AUTH (optional): can be default or implicit |
| HTTP 2 | http |
Remote host | N/A |
| NFS/Local 3 | nodelocal |
File system location | N/A |
| S3-compatible services 4 | s3 |
Bucket name | AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_REGION, AWS_ENDPOINT |
Considerations
1 If the
AUTHparameter isimplicit, all GCS connections use Google's default authentication strategy. If theAUTHparameter isdefault, thecloudstorage.gs.default.keycluster setting must be set to the contents of a service account file which will be used during authentication. If theAUTHparameter is not specified, thecloudstorage.gs.default.keysetting will be used if it is non-empty, otherwise theimplicitbehavior is used.2 You can easily create your own HTTP server with Caddy or nginx. A custom root CA can be appended to the system's default CAs by setting the
cloudstorage.http.custom_cacluster setting, which will be used when verifying certificates from HTTPS URLs.3 The file system backup location on the NFS drive is relative to the path specified by the
--external-io-dirflag set while starting the node. If the flag is set todisabled, then imports from local directories and NFS drives are disabled.4 A custom root CA can be appended to the system's default CAs by setting the
cloudstorage.http.custom_cacluster setting, which will be used when verifying certificates from an S3-compatible service.The location parameters often contain special characters that need to be URI-encoded. Use Javascript's encodeURIComponent function or Go language's url.QueryEscape function to URI-encode the parameters. Other languages provide similar functions to URI-encode special characters.
Restore Option List
You can include the following options as key-value pairs in the kv_option_list to control the restore process's behavior.
into_db
- Description: If you want to restore a table or view into a database other than the one it originally existed in, you can change the target database. This is useful if you want to restore a table that currently exists, but do not want to drop it.
- Key:
into_db - Value: The name of the database you want to use
- Example:
WITH into_db = 'newdb'
skip_missing_foreign_keys
- Description: If you want to restore a table with a foreign key but do not want to restore the table it references, you can drop the Foreign Key constraint from the table and then have it restored.
- Key:
skip_missing_foreign_keys - Value: No value
- Example:
WITH skip_missing_foreign_keys
skip_missing_sequences
New in v2.0
- Description: If you want to restore a table that depends on a sequence but do not want to restore the sequence it references, you can drop the sequence dependency from a table (i.e., the
DEFAULTexpression that uses the sequence) and then have it restored. - Key:
skip_missing_sequences - Value: No value
- Example:
WITH skip_missing_sequences
Examples
Restore a Single Table
> RESTORE bank.customers FROM 'gs://acme-co-backup/database-bank-2017-03-27-weekly';
Restore Multiple Tables
> RESTORE bank.customers, bank.accounts FROM 'gs://acme-co-backup/database-bank-2017-03-27-weekly';
Restore an Entire Database
> RESTORE DATABASE bank FROM 'gs://acme-co-backup/database-bank-2017-03-27-weekly';
RESTORE DATABASE can only be used if the entire database was backed up.Point-in-time RestoreNew in v2.0
> RESTORE bank.customers FROM 'gs://acme-co-backup/database-bank-2017-03-27-weekly' \
AS OF SYSTEM TIME '2017-02-26 10:00:00';
Restore from Incremental Backups
> RESTORE bank.customers \
FROM 'gs://acme-co-backup/database-bank-2017-03-27-weekly', 'gs://acme-co-backup/database-bank-2017-03-28-nightly', 'gs://acme-co-backup/database-bank-2017-03-29-nightly';
Point-in-time Restore from Incremental BackupsNew in v2.0
> RESTORE bank.customers \
FROM 'gs://acme-co-backup/database-bank-2017-03-27-weekly', 'gs://acme-co-backup/database-bank-2017-03-28-nightly', 'gs://acme-co-backup/database-bank-2017-03-29-nightly' \
AS OF SYSTEM TIME '2017-02-28 10:00:00';
Restore into a Different Database
By default, tables and views are restored to the database they originally belonged to. However, using the into_db option, you can control the target database.
> RESTORE bank.customers \
FROM 'gs://acme-co-backup/database-bank-2017-03-27-weekly' \
WITH into_db = 'newdb';
Remove the Foreign Key Before Restore
By default, tables with Foreign Key constraints must be restored at the same time as the tables they reference. However, using the skip_missing_foreign_keys option you can remove the Foreign Key constraint from the table and then restore it.
> RESTORE bank.accounts \
FROM 'gs://acme-co-backup/database-bank-2017-03-27-weekly' \
WITH skip_missing_foreign_keys;
Restoring Users from system.users Backup
Every full backup contains the system.users table, which you can use to restore your cluster's usernames and their hashed passwords. However, to restore them, you must restore the system.users table into a new database because you cannot drop the existing system.users table.
After it's restored into a new database, you can write the restored users table data to the cluster's existing system.users table.
> RESTORE system.users \
FROM 'azure://acme-co-backup/table-users-2017-03-27-full?AZURE_ACCOUNT_KEY=hash&AZURE_ACCOUNT_NAME=acme-co' \
WITH into_db = 'newdb';
> INSERT INTO system.users SELECT * FROM newdb.users;
> DROP TABLE newdb.users;
See Also
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