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You're reading from  PostgreSQL 14 Administration Cookbook

Product typeBook
Published inMar 2022
PublisherPackt
ISBN-139781803248974
Edition1st Edition
Concepts
Databases
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Authors (2):
Simon Riggs
Simon Riggs
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Simon Riggs

Simon Riggs is the CTO of 2ndQuadrant, having contributed to PostgreSQL as a major developer and committer for 14 years. He has written and designed features for replication, performance, BI, management, and security. Under his guidance, 2ndQuadrant is now a leading developer of open source PostgreSQL, serving hundreds of clients in USA, Europe, and worldwide. Simon is a frequent speaker at many conferences on PostgreSQL Futures. He has worked as a database architect for 30 years.
Read more about Simon Riggs

Gianni Ciolli
Gianni Ciolli
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Gianni Ciolli

Gianni Ciolli is the Vice President for Solutions Architecture at EnterpriseDB (EDB). As a PostgreSQL consultant, he has driven many successful enterprise deployments for customers in every part of the globe.Gianni is respected worldwide as a popular speaker and trainer at many PostgreSQL conferences in Europe and abroad over the last 14 years. He has worked with free and open-source software since the 1990s as an active member of the community (Prato Linux User Group, and Italian PostgreSQL Users Group). Gianni has a Ph.D. in Mathematics from the University of Florence. He lives in London with his son. His other interests include music, drama, poetry and athletics.
Read more about Gianni Ciolli

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Understanding and controlling crash recovery

Crash recovery is the PostgreSQL subsystem that saves us should the server crash or fail as part of a system crash.

It's good to understand a little about it and what we can do to control it in our favor.

How to do it…

If PostgreSQL crashes, there will be a message in the server log with the severity level set to PANIC. PostgreSQL will immediately restart and attempt to recover using the transaction log or the Write-Ahead Log (WAL).

The WAL consists of a series of files written to the pg_wal subdirectory of the PostgreSQL data directory. Each change made to the database is recorded first in WAL, hence the name write-ahead log, which is a synonym for a transaction log. Note that the former is probably more accurate, since, in the WAL, there are also changes not related to transactions. When a transaction commits, the default (and safe) behavior is to force the...

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PostgreSQL 14 Administration Cookbook
Published in: Mar 2022Publisher: PacktISBN-13: 9781803248974
© 2022 Packt Publishing Limited All Rights Reserved

Authors (2)

author image
Simon Riggs

Simon Riggs is the CTO of 2ndQuadrant, having contributed to PostgreSQL as a major developer and committer for 14 years. He has written and designed features for replication, performance, BI, management, and security. Under his guidance, 2ndQuadrant is now a leading developer of open source PostgreSQL, serving hundreds of clients in USA, Europe, and worldwide. Simon is a frequent speaker at many conferences on PostgreSQL Futures. He has worked as a database architect for 30 years.
Read more about Simon Riggs

author image
Gianni Ciolli

Gianni Ciolli is the Vice President for Solutions Architecture at EnterpriseDB (EDB). As a PostgreSQL consultant, he has driven many successful enterprise deployments for customers in every part of the globe.Gianni is respected worldwide as a popular speaker and trainer at many PostgreSQL conferences in Europe and abroad over the last 14 years. He has worked with free and open-source software since the 1990s as an active member of the community (Prato Linux User Group, and Italian PostgreSQL Users Group). Gianni has a Ph.D. in Mathematics from the University of Florence. He lives in London with his son. His other interests include music, drama, poetry and athletics.
Read more about Gianni Ciolli

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