PostgreSQL Replication

By Zoltan Böszörmenyi

Replication is a sophisticated topic yet this educational makes it so basic to assimilate because of a gently established procedure in line with examples and screenshots. As a PostrgreSQL administrator it's going to extend your horizons.

Overview

  • Explains the recent replication good points brought in PostgreSQL 9
  • Contains effortless to appreciate causes and many screenshots that simplify a sophisticated subject like replication
  • Teaches PostgreSQL directors the way to retain consistency among redundant assets and to enhance reliability, fault-tolerance, and accessibility

In Detail

PostgreSQL deals a entire set of replication comparable gains, which are used to make your database servers extra strong and far more scalable. Unleashing the ability of PostgreSQL presents the person with numerous possibilities and a aggressive virtue over different database structures. To make issues extra strong, PostgreSQL can be utilized together with a handful of subtle instruments serving quite a few diversified wishes similar to queuing, logical replication, or simplified transaction log handling.

"PostgreSQL Replication" is a realistic, hands-on consultant to PostgreSQL replication. it is going to give you the theoretical historical past in addition to uncomplicated examples displaying you ways to make replication paintings in your procedure. A extensive toolchain can be provided besides mature PostgreSQL-core technology.

"PostgreSQL Replication" begins with an creation to replication innovations in addition to the actual barriers of other replication options. you'll be guided via a variety of innovations resembling Point-In-Time-Recovery, transaction-log-based replication and you'll be brought to a collection of replication-related instruments. within the ultimate bankruptcy you'll learn how to scale PostgreSQL to many various servers utilizing PL/Proxy.

You will methods to reset PostgreSQL to a definite cut-off date and determine tips on how to reflect facts in lots of methods. you are going to take care of either synchronous in addition to asynchronous replication. as well as that, the publication covers vital themes, resembling Slony, and enhancements with nearly no downtime. we'll additionally conceal very important performance-related themes to ensure your database setups will give you excessive pace AND excessive availability.

"PostgreSQL Replication" comprises all of the details you must layout and function replicated setups. you are going to research every little thing you must recognize on your day-by-day paintings and much more.

What you'll research from this book

  • Recover a PostgreSQL database to a definite aspect in time
  • Set up asynchronous and synchronous streaming replication
  • Handle transaction log documents efficiently
  • Learn approximately Linux excessive Availability
  • Get to grips with Slony replication
  • Get PL/Proxy to scale infinitely
  • Understand pgpool and pgbouncer to enhance velocity and reliability
  • Perform quickly on-the-fly backups
  • Increase reliability and throughput
  • Improve information safeguard and geographically distribute data

Approach

This publication has a bankruptcy devoted to each one element of replication. the recent good points of PostgreSQL nine are brought and there are many sensible examples and screenshots.

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A transaction can merely be replicated if all based transactions are replicated. here's an instance: Connection 1: Connection 2: INSERT ... VALUES (1) commence; commence; INSERT ... VALUES (2) INSERT ... VALUES (3) dedicate; [ 181 ] Using Skytools Connection 1: INSERT ... VALUES (4) Connection 2: devote; take note, if we deal with queues we need to ensure that overall order is maintained if you want to in basic terms offer row quantity three to the shopper if the transaction writing row quantity four has devoted. If we have been to supply row quantity three to the patron earlier than the second one transaction in connection 1 has complete, row quantity three could successfully overtake row quantity 2. This mustn't ever be the case. relating to pgq a so referred to as ticker procedure will look after these little information. The ticker (pgqd) approach will deal with the queue for us and judge who's able to already eat what. To make the ticker technique paintings, we create directories. One will carry logfiles and the opposite one goes to shop the pid records created via the ticker strategy: hs@hs-VirtualBox:~$ mkdir log hs@hs-VirtualBox:~$ mkdir pid after we have created these directories we need to get a hold of a config dossier for the ticker: [pgqd] logfile = ~/log/pgqd. log pidfile = ~/pid/pgqd. pid ## non-compulsory parameters ## # libpq attach string with out dbname= base_connstr = host=localhost # startup db to question different databases initial_database = postgres # restrict ticker to express databases database_list = try out # log into syslog syslog = zero syslog_ident = pgqd [ 182 ] Chapter eleven ## non-compulsory timeouts ## # how usually to examine for brand new databases check_period = 60 # how frequently to flush retry queue retry_period = 30 # how usually to do maintentance maint_period = a hundred and twenty # how usually to run ticker ticker_period = 1 As we've pointed out already, the ticker is accountable for these queues. to ensure that this works properly, we need to element the ticker to the PostgreSQL example. remember that the attach string should be autocompleted (some info is already identified by way of the infrastructure and it really is used for autocompletion). preferably you'll use the database_list directive right here to ensure that basically these databases which are quite wanted can be taken. so far as logging is worried you were given concepts right here. you could without delay log to syslog or ship the log to a logfile. In our instance we've got determined to not use syslog (syslog has been set to zero in our config file). ultimately there are a few parameters to configure how frequently queue upkeep may be played etc. The ticker might be all started simply: hs@hs-VirtualBox:~/skytools$ pgqd ticker. ini 2013-05-14 17:01:38. 006 23053 LOG beginning pgqd three. 1. four 2013-05-14 17:01:38. 059 23053 LOG try out: pgq model okay: three. 1. three 2013-05-14 17:02:08. 010 23053 LOG {ticks: 30, maint: 1, retry: zero} 2013-05-14 17:02:38. 012 23053 LOG {ticks: 30, maint: zero, retry: zero} the key here's that the ticker is also begun as daemon without delay. The –d command line alternative will immediately ship the method to the history and decouple it from the lively terminal.

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