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written redo log files are overwrittenAll operation results must have been written to the data file.* If the database is in archive mode, before overwriting a fully-written redo log file, not only must the modification operation results of all corresponding transactions be written to the data file, you also need to wait for the archiving process to complete Archiving
, then this may cause the LGWR process can not get the CPU, will be queued, obviously, this will inevitably lead to log file Sync or log file parallel write waits The increase. Note: Oracle also has the ability to control the CPU prioritization of a process by means of an implicit _high_priority_processes. In a system where the CPU is relatively scarce, it can be
Log files are part of the operating system, so there must be an application programming interface (API) to support logging
Instance:
HANDLE h;if ((h = RegisterEventSource (Null,text ("metalive")) = = NULL){return FALSE;}Const char* PS = "PSZS1PSZS2PSZS3";WORD Wtype=eventlog_error_type;//eventlog_information_type;DWORD dwid=5001;int ISTR = 1;BOOL BRet;DWORD DWORD;if (h){Bret=::reportevent (H,Wtype,0,Dwid,NULL,//SIDISTR,0,ps,NULL);
Dword=::getlasterror
By default, ASP. Net does not have the permission to write system logs. To write system logs in ASP. Net, you must have the permissions first. We can solve this problem by setting or modifying the Registry Permissions.
Method 1: "START-> Run", enter the command, "regedt32", and find "System-> CurrentControlSet-> Services-> Eventlog ", select "security"> "Permissions"> "add", find the "AspNet" user on the lo
The asp.net text contains information about editing the registry. Before you edit the registry, be sure to understand how to restore the registry if a problem occurs. For information about how to restore the registry, see the "Restore Registry" Help topic in Regedit.exe or the "Restore registry key" Help topic in Regedt32.exe.
Phenomenon
When you use ASP.net to write a new "event source" to the
exceptions to system logs. That is to say, we can view the exceptions in the event viewer.
For convenience, create an appexception. CS file in the app_code folder of the website and perform the following steps:
1. Add "using system. diagnostics;" reference. The diagnostics namespace provides classes that can interact with system processes, event logs, and performance counters.
2. Create a method named pred
Replication_Error: Relay log write failure: cocould not queue event from master, eventqueue
Mysql Version: 5.6.16
OS Version: CentOS release 6.4 (Final)
Replication: Master-Master
Just now I suddenly found that the DB Master1 (currently read/write) disk is full, and DB Master2 (currently not provided for extern
Mysql version:5.6.16OS Version:centos Release 6.4 (Final)Replication:master-masterJust suddenly found that the DB Master1 (current read/write) disk is full, DB Master2 (currently not available for write) replication throws an exception: Relay log write failure:could not queue event
The forum was asked how to use the PowerShell script query file modified audit log, beans Server did not open this function, but try to write a similar script can query the log, and output the corresponding XML content.
The basic method is get-winevent, you can specify the corresponding EventID, get the list. If you w
Add in $profile:
Copy Code code as follows:
Import-module $env:P sspace\pssecurity #用于在PowerShell启动时自动加载PSSecurity程序集
The contents of the PSSECURITY.PSM1 are as follows:
Copy Code code as follows:
. $env:P sspace/pssecurity/sqlserver/get-sqlsyslogin.ps1 #导入Get-sqlsyslogin function
Write-host "pssecurity Module Added"-backgroundcolor green-foregroundcolo
://www.bkjia.com/uploads/allimg/131227/0F435C28-0.png "width =" 685 "height =" 262 "/>
If an anonymous user exists, enter the ftp host address to log on, and enter the ftp password. Only the correct value is displayed.
The Code is as follows:
==== File name: Invoke-FtpLogin.ps1 ===== Function Invoke-FtpLogin {Param ([parameter (Mandatory = $ true)] [string] $ Site =" ftp://localhost ", [String] $ User =" Anonymous ", [string] $ Pass =" hello @ worl
Sometimes you may need to analyze system files to transfer them to the hard drive, or you want to read the system log directly from "EVTX".
You can do this:
Copy Code code as follows:
$path = "$env: windir\system32\winevt\logs\setup.evtx"
Get-winevent-path $path
Another piece of code to get the system log
Copy Code code as follows:
$StartTime = (get-date). Date + (n
and other user dataThe security and system logs for our subscription appear in the Event Viewer's forwarded event after waiting 15 minutes.Finally I execute the following PowerShell command on the DC to write the log of the forwarded ev
times. This parameter is hidden in 9i, and DBAs should not care about it.DiagnosisFor system-level diagnostics, Query the V $ system_event view to determine if the average_wait is a problem.Sql> SELECT * from v $ system_event where event = ' db file parallel write ';When you are in V$system_event, you also look for accompanying events.Sql> SELECT * FROM v $ system_eventSql> where
Wait for the event log to wait for the event solution.
I insisted on reading three sets of RAC AWR every day and summarized it.
Query the SQL statement of the log wait event:
9i: select * from v $ event_name where name like '% log
Label: style using Io strong file data problems ar I insisted on reading three sets of RAC AWR every day and summarized it. Query the SQL statement of the log wait event: 9i: Select * from V $ event_name where name like '% log %'; (about 14)10g: Select name, wait_class from V $ event_name where name like '% log %';
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