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W.H.O.
Show users who are currently logged on to the system
W.H.O.
Displays the user logged on to the system, showing only the user name, logon time, terminal type
W
Displays the user logged in to the system, displays the user name, logon time, terminal type, CPU usage, current operation, and shows the total system uptime and load conditions
-F6.For example, after a user logs in, clicking the "Alt+f2" key will allow the user to see the "login:" Prompt that appears above, stating that the user sees the second Virtual Console. Then simply press "ALT + F1" key to go back to the first Virtual Console. A newly installed Linux system allows users to use "ALT+F1" to "Alt+f6" keys to access the first six virtual consoles. The most useful thing about virtual consoles is that when a program fails to cause a system deadlock, you can switch to
oracle| problems to start Oracle common problem Analysis (2003-10-1)
This article is from "Network Administrator World" 2003 phase 10th "Fault Diagnosis" column
The startup and shutdown of instances and databases is one of the important responsibilities of DBAs. Only open the database, other users can manipulate the data in the database. Once the database is closed, it cannot be manipulated. It is often the case for DBAs to shut down and restart the database in order to optimize and adjust the
, such as the data import/export operations, and do not want other users to connect to the database operation data.
(2) STARTUP FORCE
This command is actually a synthesis of forcibly shutting down the database (shutdown abort) and starting the database (startup) two commands. This command is used only if you have problems shutting down the database and you cannot close the database.
(3) ALTER DATABASE
normal working state and can accept user requests.If you open a command by using the startup Nomount or the database on startup mount, you must use the ALTER DATABASE command to perform an open database operation. For example, if you open the database as a startup Nomount, that is, the instance has been created, but the database is not installed and opened. This is the following two commands that must be run for the database to start correctly.If you start the database in startup mount, you can
Tags: Oracle startup shutdownStarting and shutting down in Oracle is roughly 3 steps from starting the instance, loading the database, opening the database, shutting down the database, uninstalling the database, shutting down the Oracle instance, respectively. So in Oracle because of this rigorous style, so that in peacetime can according to different circumstanc
A note from Data Guard Broker recently used A Broker to configure and manage Data Guard (Oracle version: 10.2.0.1.0). Earlier databases basically did not set db_domain. When database link is used, global_names = true is enabled, and db_domain is also set. Therefore, the Broker can be successfully used to configure and manage Data Guard settings. Now, no, I cannot, when switchover is used as a broker, the instances of the master and slave databases are not automatically started and need to be sta
frame: 0
TX packets: 11 errors: 0 dropped: 0 overruns: 0 carrier: 0
Collisions: 0 FIG: 1000
RX bytes: 8736 (8.5 KiB) TX bytes: 746 (746.0 B)
4. Every time you restart the NIC, always prompt
Active connection path:/org/freedesktop/NetworkManager/ActiveConnection/9
At this time, the network adapter can communicate normally, because the NetworkManager management tool developed by RedHat is not synchronized with the/etc/sysconfig/network-scripts/ifcfg-ethx configuration.
Solution:
To eliminate this
be saved in the memory first, rather than directly written to the hard disk)
No_root_squash: indicates that the root user of the client has the write permission on the directory.
4. Start the NFS serverCommand: #/etc/init. d/nfs restart
Shown below as successful
Shutting down NFS mountd: [OK]
Shutting down NFS daemon: [OK]
Shutting down NFS quotas: [OK]
2 opening and closing principle (open-closed PRINCIPLE,OCP)2.1 What is the open and closed principleThe opening and closing principle is the cornerstone of "reusable design" in object-oriented design, and is one of the most important principles in object-oriented design, and many other design principles are a means to realize the open and closed principle.In 1988, Bertrand Meyer in his book "Object Oriented Software construction" proposed the opening and closing principle, its original text is l
10181 10178 0? 00:00:00/usr/local/apache2/bin/httpd-k start
Daemon 10185 10178 0? 00:00:00/usr/local/apache2/bin/httpd-k start
Daemon 10186 10178 0? 00:00:00/usr/local/apache2/bin/httpd-k start
Derek 10194 9708 0 00:00:00 pts/1 grep httpd
Derek @ love:/usr/local/apache2/bin>
It seems that there is no problem, huh? It's okay to open it in a browser .. However, it is strange that even if I close apache, the browser can still be opened.
= Attach Error Log ===============================
Derek @
Error in building aix rac -- default gateway not configured
Environment:
Operating System: AIx 5300-09
Cluster software: CRS 10.2.0.1
Database: Oracle 10.2.0.1
Fault symptom:
The following error occurs when running the root. Sh script while building the aix rac:
[[Email protected]/u01/crs_1/install] $./rootdelete. Sh
Shutting down Oracle cluster ready Services (CRS ):
Stopping resources.
Error while stopping resources. Possible cause: crsd is down.
Threads are a popular way of getting on with multiple things at once. they are not the only way of doing this, but they are participant uarly attractive if you are faced with an API that is resolutely synchronous.
A common question that emerges once you have kicked off some concurrent work is: how do I stop it? Here are two popular reasons for wanting to stop some work in progress:
You need to shut down the program.
The user canceled the operation.
In the first case, it is oft
Recently, data guard (Oracle version: 10.2.0.1.0) is configured and managed using a broker. Earlier databases basically do not have db_domain settings. When database link is used, global_names = true is enabled, db_domain is also set, so we can successfully use the broker to configure and manage data guard settings in the past. Now we can't do it. I can't do it, it's when using the broker for switchover, the instances of the master and slave databases are not automatically started and must be ma
with the/etc/sysconfig/network-scripts/ifcfg-ethx configuration.
Solution:
To eliminate this prompt, close the NetworkManager service:
[Root @ rac01 ~] # Service network restart
Shutting down loopback interface: [OK]
Bringing up loopback interface: [OK]
Bringing up interface eth0: Active connection state: activated
Active connection path:/org/freedesktop/NetworkManager/ActiveConnection/2 [OK]
Bringing up interface eth1: Active connection state: activ
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