Steps to Restore a Table in Netezza

This guide will walk you through the process of restoring a table in Netezza.

  1. Step 1: Retrieve the backup history of the database you wish to restore by executing the following SQL query:
    2. ```sql select DBName, DBNAMEORIG, OPTYPE as Backup_Type, StartTime, BackupSet, Logfile from _v_backup_history where DBName = 'YOUR_DATABASE_NAME' and starttime > 'YYYY-MM-DD HH:MM:SS' ```

    Replace 'YOUR_DATABASE_NAME' with the name of your database and 'YYYY-MM-DD HH:MM:SS' with the desired start time. The output will look like:

    DBNAME DBNAMEORIG BACKUP_TYPE STARTTIME BACKUPSET LOGFILE TEST_DB TEST_DB FULL 2023-05-12 09:45:21 20230512094521 backupsvr.123456.2023-05-12.log

    Note that we also pull information from the DBNAMEORIG column, which can be useful if the database you want to restore has been deleted.

  2. Step 2: Identify the backup set that needs to be restored from the output of step 1.
  3. Step 3: Find the location where the backup was taken by examining the log file. The backup path can usually be found in a line similar to the following, which can be located in the /nz/kit/log/backupsvr directory:
    4. ``` 2023-05-12 09:45:21.190780 EDT Info: Backup command: /path/to/backup_Path/YOUR_SERVER.domain.com -db TEST_DB ```
  4. Step 4: Execute the following script to restore the table using the backup set identified in step 3.

/nz/kit/bin/nzrestore -dir /path/to/backup_Path/YOUR_SERVER.domain.com -backupset BACKUPSET_ID -tables Table_Name -db ‘TEST_DB’

Replace 'BACKUPSET_ID' with the ID of the backup set identified in step 3, and 'Table_Name' with the name of the table you wish to restore. If the table already exists, this command will overwrite it.

If you have differential backups and want to restore from there instead, use the following command:

``` /nz/kit/bin/nzrestore -dir /path/to/backup_Path/YOUR_SERVER.domain.com -backupset BACKUPSET_ID -increment INCREMENT_NUMBER -tables Table_Name -db ‘TEST_DB’ ```

Replace 'INCREMENT_NUMBER' with the number of increments you wish to apply (e.g., 3 for a 3rd increment backup).

If you need to restore the table in a different database, use the following command:

``` nzrestore -db TARGET_DATABASE -sourcedb SOURCE_DATABASE -backupset BACKUPSET_ID -tables Table_Name -dir /path/to/backup_Path/YOUR_SERVER.domain.com ```

Replace 'TARGET_DATABASE' with the name of the database you wish to restore the table in, 'SOURCE_DATABASE' with the name of the database containing the backup set, and 'BACKUPSET_ID' with the ID of the backup set identified in step 3.

Steps to Restore a Table in Netezza

In this guide, we will walk you through the steps to restore a table in Netezza using the RESTORE TABLE command.

Prerequisites

Steps to Restore a Table

  1. Connect to your Netezza database: Use the following command to connect to your Netezza database using your preferred SQL client.
    2.             nzsql -h  -u  -p  -d
  2. Identify the backup file: Locate the backup file of the table you wish to restore. The backup files typically have a .nzf extension.
  3. Restore the table: Use the RESTORE TABLE command along with the backup file and optional options, such as the new table name or location.
    4.             RESTORE TABLE  FROM BACKUP FILE = '.nzf' TO TABLESPACE ;
  4. Verify the restoration: After restoring the table, verify that it has been successfully restored by querying its data.
    5.             SELECT * FROM ;

Illustration

For better understanding, let's consider a simple scenario where we have a backup file named 'backup.nzf' and want to restore it to a new table called 'restored_table'. The following command will perform the restoration:

        RESTORE TABLE restored_table FROM BACKUP FILE = '/path/to/backup.nzf' TO TABLESPACE mytablespace;