Oracle Audio Technologies B10508-01 ユーザーズマニュアル

HP OpenVMS Alpha SYSGEN Parameters

CD-ROM Pre-installation Requirements

For instructions on calculating MIN_GBLPAGES, MIN_GBLSECTIONS, and 
MIN_MAXBOBMEM, refer to the READMEVMS.DOC in the RDBMS directory.

Through its interface within the SYSMAN utility, the Reserved Memory Registry 
allows an HP OpenVMS Alpha system to be configured with large amounts of 
memory set aside for use within memory-resident global sections

.  

The AUTOGEN 

utility considers the pre-allocated reserved memory when it tunes the system.

The advantages to reserving memory for an SGA are as follows:

■

You can be certain that the memory is available and that the system is correctly 
tuned.

■

The memory is reserved at boot time as contiguous aligned physical pages

.  

This allows the system to optimize the mapping of the SGA.

■

The memory is pre-allocated and zeroed

.  

This results in faster SGA mapping 

and faster instance startup.

To reserve memory for an SGA, use the SYSMAN utility

.  

The size qualifier is 

specified in megabytes

.  

For example, to reserve memory for a 6 GB SGA for the 

SID named TEST, use the following commands:

$ MCR SYSMAN

SYSMAN> RESERVED_MEMORY ADD ORA_TEST_SGA/SIZE=6144/ALLOCATE/ZERO/PAGE

SYSMAN> EXIT

Then run AUTOGEN and reboot the system to allow AUTOGEN to adjust other 
system parameters for the reduced amount of memory that is available to the rest of 
the system.

Memory for multiple SGAs may be reserved

.  

Any change to the name or size of a 

piece of reserved memory may require rebooting the system

.  

During instance 

startup, Oracle server compares the size of the reserved memory, if any, with the 
size of the SGA

.  

If appropriate, one of the following messages will be included in 

the Alert log:

1 GB = 1024 MB