Check memory On Linux

Sometime you as DBA you need to check your memory On Operating System Level, i will give you some command will useful to you :

1-free -m / free -g

m : megabytes
g : gigabytes

              total    used     free   shared  buffers   cached 
Mem: 503 451 52 0 14 293
-/+ buffers/cache: 143 360
Swap: 1027 0 1027

 another example :

free -t -m
       total       used       free     shared    buffers     cached
Mem: 750 625 125 0 35 335
-/+ buffers/cache: 253 496
Swap: 956 0 956
Total: 1707 625 1082
2-vmstat

procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 0 0 131620 35432 341496 0 0 42 82 737 1364 15 3 81 1
 
 
 
 
3-top 
 
 
 

4-gnome-system-monitor
 
 
 
The below Command for clear cache memory in linux 

sync; 
echo 3 > /proc/sys/vm/drop_caches
 you can make it as job in linux save in it crontab 
0 * * * * /root/clearcache.sh
 
Create a file in '/root' called 'clearcache.sh' with the following content:

#!/bin/sh  
sync; echo 3 > /proc/sys/vm/drop_caches
 
  
Thank you 
osama mustafa 

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