applications that require high reliability and load balancing.
5. Standalone MySQL Servers (Functionally separated) (Active)
Multiple independent servers with separated functions do not have high reliability and load balancing capabilities. They have many obvious disadvantages and are not considered.
Summary:
The HA solution recommended on the official MySQL website is combined with DRBD (solution 3 in this article) and Replication (solution 4 in this article ). In addition to Linux Heartbeat,
operations;
3) read-only server load balancer is scalable.
Disadvantages:
1) high reliability without write operations;
2) load balancing without write operations;
3) No scalability in write operations;
Speed:
1) same as a separate server; better support for reading operations
Application scenarios:
1) Read-intensive applications that require high reliability and load balancing.
5. Standalone MySQL Servers (Functionally separated) (Active)
Multiple independent servers with separated functions
Detailed description of archiver in the packaging module of nodejs, nodejsarchiver
Archiver is a module that supports cross-platform packaging in nodejs. It can be zip and tar packages. It is a relatively easy-to-use third-party module.
Install the archiver module before use.
Copy codeThe Code is as follows:Npm install arc
Antelope is a innodb-base file format, Barracude is a file format introduced after Innodb-plugin, and Barracude also supports Antelope file formats. The difference between the two is:
File format
Support Row format
Characteristics
Antelope(innodb-base)
Row_format=compactRow_format=redundant
The difference between compact and redumdant is that the contents of the first deposit are different.The compact's storage format is a non-null variable long field le
An example of ORA-00257 archiver error. error Solution
An Oracle vulnerability is found here. For example:DELETE JEW_LOG WHERE C_ID IN (SELECT C_ID FROM BAS_BATCHNO WHERE C_WARID = '028' AND C_BATCHNOTYPE = 'P ')
The subquery in this DELETE statement reports an error because the C_ID field is not found. Therefore, the JEW_LOG table is corrupted, and 98292 data records are deleted directly. Thanks to the habit of First delete, after commit ). data will
Copyright in titleIn the original discuz X1 version, remove "powered by discuz!" from the title !" The Copyright logo is easy. You only need to modify the public file in the template file header and set the ['bbname']-Powered by discuz!However, discuz X2 directly converts-powered by discuz! "-" Is placed in the Variable. Therefore, after the title is deleted, there will be a small-tail after a sentence, which is unfriendly to the search engine. Therefore, there is also a good solution, that is:O
1, User connection errorSql> conn Scott/[email protected];ERROR:Ora-00257:archiver error. Connect internal only, until freed. --Archive error (log space full)Rman joins the same error in the form of catalog.2, check the use of Flash_recovery_area_usageSql> Conn/as sysdba;Connected.Sql> Show parameter log_archive_dest;NAME TYPE VALUE------------------------------------ ----------- ------------------------------Log_archive_dest stringLog_archive_dest_1
1. Let's start with a new Freescada engineering example to see the actual storage effect:A) set up several data channels as a data source (Communication menu Editor, Channels tree display):b) Create a Database Archive (Toolbar archiver Settings):c) Define the database connection properties (Databases Settings submenu under the Project menu):d) Compile the project and run to view the database storage results:2. Stored Procedure Inquiry (
Post: original address http://blog.csdn.net/panys/article/details/3838846
Archive log is fullORA-00257: How to Handle archiver error. Connect internal only, until freed error
1. Log On with the sys userSqlplus sys/pass @ tt as sysdba
2. Check the location of the archiv log.SQL> show parameter log_archive_dest;NAME TYPE VALUE-----------------------------------------------------------------------------Log_archive_dest stringLog_archive_dest_1 stringLo
Descriptiongreat! Your new software is almost finished! The only thing left and do are archiving all your n resource files into a big one.Wait a minute ... you realized the it isn ' t as easy as you thought. Think about the virus killers. They ' ll find your software suspicious, if your software contains one of the m predefined virus codes. You absolutely don ' t want this to happen.Technically, resource files and virus codes are merely strings. You've already convinced yourself that's none of t
A hint was encountered when compiling VLC:/usr/share/automake-1.14/am/ltlibrary.am:warning: ' lib/libtiger.la ': Linking Libtool libraries using a non-posix/usr/share/automake-1.14/am/ltlibrary.am:archiver requires ' am_prog_ar ' in ' configure.ac 'Check the N-long Web page, the final solution makes people want to dozens.In the compiled library directory, find ' Configure.ac ', open with a text editor,Ac_prog_cc_c_oAc_prog_libtoolAc_prog_grepAc_prog_nmAc_prog_sedFind text similar to the above an
Error
Environment: winxp+oracle9.2.0.1 Client
win2003+oracle9.2.0.5 Service Side
First, the error process:
Execute the following statement on the client:
Conn SCOTT/TIGER@PGJT
Declare
I number;
Begin
Select S.nextval into I-dual;
While iLoop
Insert into B values (i);
End Loop;
End
An error occurred, the client is a fake panic phenomenon.
Open a new window:
Sql> Conn SCOTT/TIGER@PGJT
is connected.
Sql> select Sid,serial#,username from V$session;
SID serial# USERNAME
--------- --------- ---------
"Peer Authentication" means that it ' s comparing your database username against your Linux username. It should work if your ' re logged in as postgres . You probably don ' t want md5 pg_hba to hits that rule in, as the postgres database user generally doesn ' t has a password.–The problem you has is, so if u dont define the Host, your system would decide.Explicit add "-H localhost", this would fix itPg_dump: [Archiver (DB)] connection to Database "dB
Ora-00257:archiver error. Connect internal only, until freed error handling methodBackground: Recently always in the Oracle database, a few days ago to a company's Oracle database to do a real-time synchronization function, synchronization must open the Archive log function, due to the large volume of production data, less than 1 days to the Oracle log space is full. The following error is reported: Ora-00257:arch
Errors occurred during Thebuild.Errors running builder ' Maven Project Builder ' on Project ' Ebus.transaction '.Org/codehaus/plexus/archiver/jar/jararchiverTwo ways of referencing:The first type: Specify the version number in the Maven-compiler-plugin plugin in the Pom.xml fileThe second type:(1) Close Eclipse(2) The \.m2\repository\org\codehaus\plexus\plexus-archiver Delete Only the latest version left(3)
Resource archiver
Time Limit: 20000/10000 MS (Java/others) memory limit: 100000/100000 K (Java/Others)Total submission (s): 899 accepted submission (s): 238 Problem descriptiongreat! Your new software is almost finished! The only thing left to do is archiving all your N resource files into a big one.
Wait a minute... You realized that it isn' t as easy as you thought. think about the virus killers. they'll find your software suspicious, if your softw
Ora-00257:archiver error. Connect internal only, until freedThe reason is that the log is full, according to the above URL provides the steps to be able to delete the partial archive log.1. First view current Flash recovery area usageC:\windows\system32>sqlplus Sys/[email protected] as SysdbaSql*plus:release 11.2.0.1.0 Production on Wednesday September 4 18:08:48 2013Copyright (c) 1982, Oracle. All rights reserved.Connect to:Oracle Database 11g Enterp
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