Reason/components behind high memory utilisation on linux Post: 302695107

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Operating Systems Linux Reason/components behind high memory utilisation on linux Post 302695107 by jim mcnamara on Saturday 1st of September 2012 10:39:38 AM

09-01-2012

Registered User

Define crashed, please. What Oracle error? I think it is likely that you have heap fragmentation.

You apparently have a lot of db's running on this box. Up through 11g, oracle will not create non-contiguous shared memory segments for the "SGA" without a nasty warning. The db in question will start but you may get memory errors later on. I would look in the oracle alert logs for these warnings. Or ask the DBA to do it.

Heap fragmentation means: there are lots of allocated memory chunks sprinkled around, often with intervening smaller areas of free memory. While the smaller ones are perfectly usable some applications have issues with trying to use a bunch of small ones as a single large block. Oracle has this issue.

The simple solution is either more memory or move off db's to another box.

BTW: for linux showing lots of memory "in use" is completely normal. Your problem seems to be from what I see in the ipcs -m display.

jim mcnamara

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LEARN ABOUT SUSE

uuid_compare

UUID_COMPARE(3) 						    Libuuid API 						   UUID_COMPARE(3)

NAME

       uuid_compare - compare whether two UUIDs are the same

SYNOPSIS

       #include <uuid/uuid.h>

       int uuid_compare(uuid_t uu1, uuid_t uu2)

DESCRIPTION

       The uuid_compare function compares the two supplied uuid variables uu1 and uu2 to each other.

RETURN VALUE

       Returns	an  integer  less  than, equal to, or greater than zero if uu1 is found,  respectively, to be lexigraphically less than, equal, or
       greater than uu2.

AUTHOR

       Theodore Y. Ts'o

AVAILABILITY

       libuuid is part of the util-linux-ng package since version 2.15.1 and is  available  from  ftp://ftp.kernel.org/pub/linux/utils/util-linux-
       ng/.

SEE ALSO

       uuid(3), uuid_clear(3), uuid_copy(3), uuid_generate(3), uuid_is_null(3), uuid_parse(3), uuid_unparse(3)

util-linux-ng							     May 2009							   UUID_COMPARE(3)

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