postgresql replication

MySQL replication is primarily replicated from the primary master. What is master-slave replication Master-slave replication means that there is a single device to do as the primary server, one or more servers as from the server. No data is written from the server, and the source of the data is the primary server. The purpose of the

subsequent value starting from 1. Other behaviors can be obtained by using special parameters in the create sequence command. For more information, see the command reference page.E. the nextval operation will never roll back to avoid blocking the current transaction for obtaining a value from the same sequence. That is to say, once a value has been taken away, it is deemed to have been used, even if the transaction that calls nextval exits again. This means that the exited transaction may leave

changed to complex analysis functions because the analysis functions include window functions. 5. The multi-process architecture is more stable. A single machine can support databases with higher access volumes. 6. There is a powerful and excellent performance GIS plug-in Postgis.Our upcoming RDS for PostgreSQL not only has the features of native PostgreSQL, but also inherits the excellent features of RDS

(Linux + Apache + PostgreSQL + PHP) Environment in Ubuntu Install and configure phppgAdmin on Ubuntu Install PostgreSQL9.3 on CentOS Configure a Streaming Replication cluster in PostgreSQL How to install PostgreSQL 7/6 and phpPgAdmin in CentOS 5/6. 4 ------------------------------------ Lili split line ---------------

Knowledge background??I. MARIADB copy-related knowledge??Source of 1.mariadb???? MySQL database is currently in the database market share only second only to the Oracle database, but also the open source database leader. Because MySQL database is open-source and high-performance, but also free (but not optimistic after Oracle acquisition), so the father of MySQL has opened a new MySQL branch mariadb,mariadb relative MySQL version of the update fast, the new features are installed quickly, The be

house. This article permanently updates the link address: ------------------------------------ Lili split line ------------------------------------ Install PostgreSQL 6.3 on yum in CentOS 9.3 PostgreSQL cache details Compiling PostgreSQL on Windows Configuration and installation of LAPP (Linux + Apache + PostgreSQL +

The so-called "copying objects" generates a "sibling brother" that is exactly the same as the specified object ". For object replication, there are two scenarios: shallow replication and deep replication. 1. Shallow copy: when the field value of the object is copied, the object referenced by the field will not be copied. For example, if an object has a fiel

This article demonstrates how to build the most basic transactional replication.Environment Preparation: 2 virtual machines:The server names are Repa and Repb,repa are publishers, and REPB are subscribers. Are installed WindowsServer 2008r2 English version (the reason for working in a foreign company). and ensure that the two servers can exchange visits.SQL Server:In the above virtual machine, install SQL Server R2 x64 English Enterprise Edition separately.Demo Database:Microsoft Sample Database

The ultimate goal of data replication is to synchronize the data of one server with the data of another server, which can achieve data redundancy or load balancing of services. A master server can connect multiple slave servers, and the slave server can act as the master server in turn. The master-slave server can be located in different network topologies. Due to the powerful mysql replication function, th

The previous blog said how to use Xtrabackup to back up and restore databases. After the database has been restored, the two machine databases are the same, including Binlog file and Pos.At the same time, after the Xtrabackup backup is completed, the relevant Binlog file and POS information has been written to the backup information file, and the cat can view it under Linux. Then execute the Change Master command on the standby to successfully build the master-slave

(1) User PracticalityProgram: Createdb creates a new PostgreSQL database (same as SQL statement: Create Database) Createuser creates a new PostgreSQL user (same as SQL statement: create user) Dropdb deletes a database Dropuser: delete a user Pg_dump exports the PostgreSQL database to a script file Pg_dumpall: export all

MariaDB's GTID replication and multi-source replication, mariadbgtid Replication What is GTID? GTID is the global transaction ID (global transaction identifier). It was initially implemented by google and officially added to MySQL in MySQL 5.6. GTID is actually composed of UUID + TID. UUID is the unique identifier of a MySQL instance. TID indicates the number of

PostgreSQL database server listener settings and Client Connection Methods tutorial, postgresql Server As we all know, PostgreSQL is a free object-relational database server (Database Management System). It is an open-source database system that can be used for free. This article describes in detail the listener settings and Client Connection Methods of the

Processing Method for PostgreSQL database transactions in unknown state, postgresql Processing Method Background Database transactions are atomic operations, either successful or failed. However, from the client perspective, there may be a third State: unknown. After the client submits a transaction (rollback, commit, prepare xact, rollback pxact, commit pxact) Request, the database receives the request and

pg_mirror.conf under the PG data file. [Root @ TEST-DB ~] # Su-postgres -Bash-4.1 $ cd/var/lib/pgsql/9.5/data/ -Bash-4.1 $ ls-l | grep conf -Rw ------- 1 postgres 4224 Jan 21 pg_hba.conf -Rw ------- 1 postgres 1636 Jan 21 09:53 pg_ident.conf -Rw ------- 1 postgres 88 Jan 21 postgresql. auto. conf -Rw ------- 1 postgres 21738 Jan 21 postgresql. conf There are a lot of content in pg_hba.conf. We need to modi

In the case of manual installation (for the case where the source code is compiled for PG or the decompressed version is installed for PG), PG does not start automatically when it is started, and stops automatically when it is turned off, as a DBA, this is obviously unacceptable. 1. Self-starting services in Windows In Windows, you can use the pg_ctl command to generate the postgresql service and enable it to start itself. In fact, the installation v

Asynchronous replication: MySQL natively supports one-way, asynchronous replication. Asynchronous replication means there is a delay in copying data from one machine to another-most importantly this means that the data cannot be copied/applied to the slave at the same time when the application's transaction commit has been confirmed. Typically, this delay is dete

Tags: mysql replicationMySQL replication principle/library-based multi-threaded replication principle/BLGC-based multi-threaded replication principleSingle thread master-slave replication:From the library to the main library to request Binlog, and binlog into their own relaylog, from the library redo Binlog inside the SQL,This is done mainly by the following thre

Five tips for Instagram to improve PostgreSQL performance, postgresql Performance Optimization As Instagram grows, Postgres continues to serve as a solid foundation for Instagram and stores a vast majority of user data. Less than a year ago, we also wrote on our blog that Instagram "stores a large amount of data" and adds 90 pieces of data per second. Now, this data has increased to 10000 pieces of peak dat

Label:synchronous, asynchronous, semi-synchronous replication comparison:Synchronous replication: Master commits the transaction until the transaction is committed at all slave, and the client is returned, and the transaction is completed. Disadvantage: There can be a significant delay in completing a transaction.Asynchronous replication: Requests Binlog to Maste