Concurrency And Backups; The Backup Statement - Sybase Adaptive Server IQ 12.4.2 Administration And Performance Manual

Concurrency and backups

The BACKUP statement

• For stacker devices that hold multiple tape drives, all tapes for a given
device must be the same size.
Sybase recommends that you always start a new tape for every backup.
Before starting a backup to disk, Adaptive Server IQ first tests whether there is
enough disk file space for the backup. For an operator-attended backup to disk,
if there is not enough space,
disk before it writes any data. The backup does not start until you provide more
disk space.
Likewise, if you run out of space during an attended disk backup,
closes all open backup files and waits until it detects that you have cleared
some space. Then it restarts with new backup files. You can also stop the
backup if you prefer.
By default, you must provide at least 8KB of free disk space before the backup
resumes.
Unattended backup cannot prompt you to provide more space. If enough space
is not available, unattended backup fails.
differently for unattended backups. See "Unattended backup" for details.
For an operator-attended backup to tape,
it runs out of room, you must mount additional tapes.
Backups can be run concurrently with all other database operations with one
exception: no metadata changes can occur while the Catalog Store is backed
up. Be aware, however, that transactions that have not committed when you
start a backup are not backed up. If a system or media failure occurs during
backup, you cannot restore uncommitted transactions.
Once a backup is started, you cannot execute a
To back up an IQ database, use the following syntax:
BACKUP DATABASE
...[ CRC ON | OFF ]
...[ ATTENDED ON | OFF ]
...[ BLOCK FACTOR integer ]
...[ { FULL | INCREMENTAL | INCREMENTAL SINCE FULL } ]
CHAPTER 11 Backup and Data Recovery
prompts you to move some files from the
BACKUP
treats size estimates
BACKUP
simply begins the backup. If
BACKUP
CHECKPOINT
BACKUP
command.
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