7.7.1.7.18 xrmemcachemin Attribute
Purpose
The xrmemcachemin
attribute specifies a minimum
guaranteed space allocation in the Exadata RDMA Memory
Cache (XRMEM cache).
Syntax
ALTER IORMPLAN
dbplan=(( name=db_name, ... xrmemcachemin=number ... ) ... )
Usage Notes
-
You specify the value for
xrmemcachemin
in bytes. You can also use the suffixesM
(megabytes),G
(gigabytes), orT
(terabytes) to specify larger values. For example,300M
,150G
, or1T
. -
The value for
xrmemcachemin
must be at least 4 MB. -
In any plan, the sum of all
xrmemcachemin
values cannot exceed the size of the XRMEM cache. -
If
xrmemcachelimit
is specified, then the value forxrmemcachemin
cannot exceedxrmemcachelimit
. -
If
xrmemcachesize
is specified, then the value forxrmemcachemin
cannot exceedxrmemcachesize
. -
On Exadata X8M and X9M systems with Oracle Exadata System Software release 23.1.0, the persistent memory data accelerator, previously known as PMEM cache, is now called XRMEM cache.
For backward compatibility, on Exadata X8M and X9M systems, you can use
pmemcachemin
instead ofxrmemcachemin
in theALTER IORMPLAN
command. However, starting with Oracle Exadata System Software release 23.1.0, output from theLIST IORMPLAN
command only displaysxrmemcachemin
.
Parent topic: ALTER IORMPLAN