100% ram used on Data-Guard

Hello

We test our application with Oracle data guard.
Is version of Oracle 11 g R2 (11.2.0.2)
The configuration of data-guard is a primary and a physical standby server.
Both servers have 16 GB of RAM. It is set on an ESX Server as two virtual machines.
Each vm has two processors with a speed 2127,902 MHz
OS is Red Hat Enterprise Linux Server version 5.5 (Tikanga)
It's an arch bit x86_64 machine.

The problem we see is that the consumption of RAM is almost 100%. (97%)
Earlier, the RAM has 4 GB, believed is not enough and went to 16 GB after we found that same 8 GB is not enough.
Even after setting the RAM 16 GB, entire memory was used.
The demand for good results, the answers are quick enough.
On average, there are 12000 inserts per minute in the database.

The CPU usage is about 25%.


We are looking to reduce the consumption of memory less than 80% so that if other applications must be run on the Data-Guard allows him to run or use nearly 100% of memory during the peak or abnormal conditions.

It is a facility dedicated with instance what a single database that is running on the firewall data.

Here is the use of memory (in MB)
< -.
[root@vm-lnx-rds1174 logs] free no. m
total used free shared buffers cached
MEM: 16051 15650 401 0 267 13532
-/ + buffers/cache: 1850 14201
Swap: 8095 0 8095
->

Here is the related configuration memory set to the oracle instance.
< -.
change the system shared_pool_size set = 0 scope = spfile;
change the system db_cache_size set = 0 scope = spfile;
change the system java_pool_size set = 0 scope = spfile;
ALTER system set LARGE_POOL_SIZE is 0 scope = spfile;.
change the system sga_max_size set = 0 scope = spfile;
ALTER system set sga_target is 0 scope = spfile;.
ALTER system set pga_aggregate_target is 0 scope = spfile;.
ALTER system set MEMORY_TARGET = 8G scope = spfile;
ALTER system set MEMORY_MAX_TARGET = 8G scope = spfile;
->

Details of the Configuration of Data-Guard:
< -.
DGMGRL > see Configuring

Configuration - DGConfig1

Protection mode: MaxPerformance
Databases:
PNETs - primary
PNET - Physical standby database

Fast-Start Failover: DISABLED

The configuration status:
SUCCESS
->


Please advice how we can reduce the memory consumption on the machine.

Thank you
Krishna

Hello

on Linux, high mem use is normal. Linux uses all the memory cache of the drive. You can compile this program to prove.

#include 
#include 
#include 
#include 

int main(int ac, char **av)
{
        long int n,m,i;
        long delay;
        char *buf;

        if(ac < 3) {
                printf("Usage: %s  \n",av[0]);
                exit(1);
        }
        sscanf(av[1],"%d",&n);
        sscanf(av[2],"%d",&delay);
        m=n*1024*1024;
        buf=malloc(n*1024*1024);
        // for(i=0;i

and run it as follows:
. 4000 10 a.out

It will affect 4000 MB of ram 10 seconds. You'll see that once it's over, you have 4 000 MB of free ram. After awhile, this amount will be lower that linux will do IO operations.

Paul

Tags: Database

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    Cut 8 objects

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