Seagate ST43401N/ND Instalační příručka stáhnout pdf (Strana 75)

CHAPTER 6 Implement: Making Database Administration Changes

You must configure the local and remote Backup Servers at startup by

providing the appropriate values to the command line options. A remote dump

to greater than 25 stripes with the local and remote Backup Servers started with

default configuration will fail because the maximum number of network

connections that Backup Server can originate (specified by the

-N option) is by

default 25. The maximum number of server connections into the remote

Backup Server (specified by the

-C option) is 30.

Dump Format

In Backup Server 12.0 the stripe number must be stored in integer format.

Earlier versions of Backup Server stored the stripe number in the HDR1 label

in ASCII format in 4 bytes. Thus, earlier Backup Server versions will not be

able to load a dump file that uses the version 12.0 dump format. However,

Backup Server 12.0 can read and write earlier versions of the dump format.

Dump or load operations involving one or more remote servers will abort with

an error message in the following instance: if one or more remote servers uses

an earlier Backup Server version and the number of stripes to which the

database is dumped (or from which it is loaded) is greater than 32.

Suspending Updates to Databases for Copying

Adaptive Server version 12 provides the new quiesce database command to

temporarily suspend updates to databases. You may want to suspend database

updates to use an external database backup utility or to unmirror a disk. While

the database is in the quiescent state, read transactions from the database are

allowed. You can suspend and restart transactions with the

quiesce database

command issued from different user sessions.

If you have multiple databases on a single device, and you want to copy the

entire device, you need to quiesce all the databases on the device before you

perform the copy. If you have multiple devices for a single database, be sure to

copy all the devices.

For more information on the

quiesce database command, see the System

Administration Guide at http://manuals.sybase.com:80/onlinebooks/group-

as/asg1250e/sag/@Generic__BookView

for ASE 12.5.

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Seagate ST43401N/ND Instalační příručka Strana 75