postgresql replication

Xlog file. The server provides a process called pg_switch_xlog () to do this work:test=# SELECT Pg_switch_xlog ();Pg_switch_xlog----------------0/17c0ef8(1 row)You might call this process when some important patching work is done or you want to make sure that a particular database is securely present in your Xlog archive.3.5 SummaryIn this chapter, you've learned about instant recovery, a safe and easy way to recover your PostgreSQL database to any t

server can accept the write request, and the modified data must be broadcast from the original server to all other servers before the transaction is committed. Excessive write actions result in excessive locking, which results in poor performance. In fact, the performance of simultaneous writes on multiple servers is always lower than the performance written on a single server. Read requests will be distributed evenly to each individual server. Some implementations use shared disks to reduce co

. [The performance loss of only one connection is certainly larger than in the case of many connections. Keep in mind that you can work in parallel, network latency does not use more of our I/O or CPU bandwidth, so we can reduce the impact of slow transactions by initiating more concurrent work. ] When using synchronous replication, how can you ensure that performance does not suffer too much? Basically, there are several important recommendations tha

Label:2.3 Understanding consistency and data lossIt is not possible to mine PostgreSQL transaction logs without regard to consistency. In the first part of this chapter, we have largely explained the basic idea of the transaction log. You already know that the ability to make data in a good shape without prior log changes is difficult or even impossible. So far, most of us have been discussing the problem of collapse. It is absolutely not good to lose

use cascade replication, you need at least PostgreSQL9.2. ]Shows the basic schema:The slaves on the far side of the picture can act as a transfer node here. With this very simple approach, you can basically create a wireless-scale system. The process of setting up is basically the same as setting up a single slave. You can easily make basic backups from a running slave (postgresql.conf and pg_hba.conf must be configured just like a single master).[To

one of the ways that PostgreSQL master-slave replication is implemented:Standby-based asynchronous stream replication, which is a nice feature provided after the postgresql9.x version (2010.9), similar functionality is available in Oracle after 11g for active dataguard and SQL Server Log shipping provided after version 2012, here again for PG applause, is really

Working with WalbouncerIn the final chapter of this book, you will be guided to a tool that was released in 2014, called Walbouncer. Most of the tips in this book show how to replicate an entire database instance, how to Shard, and so on. In the last chapter, it is about Wabouncer, which is all about filtering the transaction log stream to selectively replicate database objects from one server to a group (not necessarily identical) slave.This chapter covers the following topics:The basic concept

Tags: PostgreSQL synchronous stream replication Node Ip Role Master 10.10.100.1 Master Standby1 10.10.100.2 Standby1 Standby2 10.10.100.3 Standby2 The user that is required to create the stream replication on master.CREATE ROLE

ObjectiveSimply record one of the implementations of PostgreSQL master-slave-asynchronous stream replication based on standby, This is a nice feature that is provided after the postgresql9.x version (2010.9), similar to the log shipping that is provided after the active Dataguard and SQL Server 2012 versions of Oracle are available after 11g, Here again for PG applause, is really a great open source databas

syncs Resumed:bard $ tail Log.bucardo (27344) KID (bard) Delta count for S1.public. " Character ": 1 (27344) KID (bard) Delta count for S2.public." Character ": 1 (27344) KID (bard) Conflicts for public." Character ": 1 (27344) KID (bard) Conflicts have been resolved (27344) KID (bard) totals:deletes=2 inserts=2 con Flicts=1 Bucardo 5 is a lot more powerful than the demo we have here. In future blog posts, we'll include other features that it can do from

one line of code and run it; Pg_basebackup will do all the rest for you.In this example, we will assume that we are going to make a basic backup of a host called postgresql-support.de. You must perform the following steps:• Modify pg_hba.conf to allow replication• Signal Master to consider changes in pg_hba.conf• Call Pg_basebackupModify Pg_hba.confIn order to allow a remote server to log on to a

Use Bucardo5 to implement master database replication of PostgreSQL, bucardo5postgresql The next generation of asynchronous primary database replication system Bucardo 5 is released. This version removes the restrictions on two database sources in the old version, allowing more source databases (Primary databases) and more target databases (Backup databases ). Bu

Tags: PostgreSQL asynchronous stream replication standby auto-activation Node Ip Role Citus-master 10.10.100.1 Master Citus-standby 10.10.100.2 Standby The user that is required to create the stream replication on master.CREATE ROLE replica