In the development of operations we often encounter similar to "Socket/file:can" T open so many files, "Unable to open more processes", or coredump too large problems, which can be set resource constraints to solve. Today, when I was teaching a
Transferred from: http://www.cnblogs.com/niocai/archive/2012/04/01/2428128.htmlFunction Description:Gets or sets the resource usage limit. Each resource has a related soft and hard limit, and the soft limit is the limit that the kernel imposes on
First, the signalThe signal is used to notify the process that an asynchronous event has occurred. The kernel can also send a signal to the process because of an internal event, notifying the process that an event has occurred. Note that the signal
Look at the next day, or to learn the operating system related, for the behind write driver preparation.Process process is the basic concept in any multi-channel program designed operating system. A process is typically defined as an instance of
Ulimit-n modificationTemporary modification: Ulimit-shn 65535Permanent modification: Echo ' *-nofile 65535 ' >>/etc/security/limits.confLinux system open the maximum value of the file descriptor, the general default value is 1024, for a busy server,
User Management
Create a user : The new user created has no permissions, and even the right to log on to the database does not have the right to specify the appropriate permissions.
Sql> Create User usernameIdentified by passwordDefault tablespace
ora-28001:the Password has expired
Cause:the user "s account has expired and the password needs to be changed
Action:change the password or contact the DBA
Program Connection DB server times error:
13-04-22 17:32:15 [ERROR] com.sohu.game.Main
Modified the user password, the next day came to find the user is locked, walking in the evening is also good.Alter profile DEFAULT limit failed_login_attempts UNLIMITED;Alter user xxxx account unlock;Ok!--1.--System parameter configuration connect
When you create the database, the SYS login in the Oracle database is unlocked with the following SQL Sql*plus tool.1, through the data dictionary dba_users, check the lock status of the Oracle account, as follows: (v wherein, open indicates that
Signal and its introduction
A signal is a process communication method that applies to the processing of asynchronous events. The realization of signal is a kind of soft interrupt. It is sent as a running process, and a process has been told that
1. Create and manage accountsUser, user account, pattern terminologyUsers, user accounts, patterns are often replaced by use, but these terms are not exactly the same.The user connects to the user account by establishing a session to the instance
After the execution of Utlpwdmg.sql ORA-28003, ORA-20001, ORA-20002, ORA-20003, ORA-20004 error.Suitable for:Oracle server-enterprise edition-version 8.1.7.0 and laterInformation in this document applies to any platform.Checked for relevance on
Ulimit is a computer command used by the shell to start a process that consumes resources that can be used to modify system resource limitsCommand Common parameters-H sets the hard resource limit.-S sets the soft resource limit.-A displays all
to access aMysqlserver, you need to log in with a user account to proceed. Each MySQL user account has many properties associated with it, such as user name, password, and permissions and resource restrictions. Permissions define the ability of a
One ORA-28000: theaccountislocked user-locked troubleshootingToday, my colleague reflected a problem, a test database modified the password, and changed the password used by the relevant application, still appear after a while the account is locked,
The Analysis and Solution of the ORA problem is actually a good learning idea. Grasp every ORA error and further analyze some causes. In conclusion, there will always be different gains.
The Analysis and Solution of the ORA problem is actually a
How to release the Oracle server with too many connections will crash. After the client network cable with too many connections is pulled out, the user's connections will still be retained on the remote Oracle, and the user's connections will not be
Program causes the application pool of the IIS server to stop, and the application pool of the iis server to stop.
When the program runs to a certain step, the application pool stops automatically. The results are consistent after several attempts.
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