How to enables command-line history in SQL*PLUS
SQL*PLUS (sqlplus) does not let you press the up or down arrow to browse previous commands. It only lets you inspect one previous command, making repeated commands inconvenient.
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Oracle.
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Show running processes in Oracle DB
Oracle tip: a script displays queries running on an Oracle database, similar to show processlist in MySQL.
How to turn off Oracle password expiration
By default, Oracle user passwords expire after 180 days and must be changed. To remove the expiry, change PASSWORD_LIFE_TIME on the user's profile.
Red Hat changes its distribution policy
Red Hat has changed its RHEL kernel patch distribution policy: it applies patches first, then releases the kernel source as a single tarball.