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Linux administration, Linux/Unix Tips and Tricks, RedHat

server time off, due to hardware clock out of sync

by admin • January 1, 2016

On reboot the server time can be out of sync, because hard clock is out of sync. This can be checked by running”hwclock; date” and comparing the results.   In Red Hat 6, the ntpdate start-up script is is separate from…

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Linux administration, Linux/Unix Tips and Tricks, RedHat, Unix Shell Scripting, Unix/Linux Performance

How to get CORRECT memory usage for Linux

by admin • August 18, 2015

One of the most common mistakes made by Linux users, is to run free (Mem: line) or sar to get memory utilization.   The memory used fields include the space used by the OS to cache files and directory info cace,…

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oracle

Monitoring Oracle Active Session History (ASH)

by admin • July 7, 2015

To monitor Oracle Active Session History (ASH) run the following query: select total_size,awr_flush_emergency_count from v$ash_info;  

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