Very basic question about Archive logs - Mailing list pgsql-novice

From Subramanian,Ramachandran
Subject Very basic question about Archive logs
Date
Msg-id dee8d2457c034cddb7ab7021e1caf3f7@alte-leipziger.de
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Responses Re: Very basic question about Archive logs
List pgsql-novice

Hallo,

 

     Newbie here. Kindly forgive my ignorance. A question about archive logs.

 

If I make a pg_basebackup on Monday (backup ended )  at 0100 Hours  and have all the archive logs from this time onwards till the next backup on Tuesday (backup ended) at 0100 Hours, I could theoretically go to any PIT between Monday 0100 Hours to  Tuesday 0100Hours .  Is my understanding correct?

 

Further more, if I execute the PIT-recovery On Tuesday at 0005 Hours and specify a Target recovery time of Monday 2300 Hours, then  Postgres will look at the active logs and any archive logs ( if it does not already exist in the active logs ) that were written between Tuesday 0005 Hours and Monday 2300 Hours and use these logs to Undo all the changes to the current Database. Is my understanding correct?

 

In Postgres PIT recovery, there is only rollback allowed … No roll forward allowed ?  For example Could I restore the backup from Monday 0100 Hours and somehow rollforward the logs?

 

 

Additionally, where does postgres keep a record of which log was cut at what time and which active log was archived at what time to be reused ?

 

 

LG


Ram


Freundliche Grüße

i. A. Ramachandran Subramanian

Zentralbereich Informationstechnologie

Alte Leipziger Lebensversicherung a. G.

Hallesche Krankenversicherung a. G.

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