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In postgresql 9.4 server streaming replication, from where wal files are transfer to standby? whether from wal buffer or pg_xlog

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Continuous archiving can be used to create a high availability (HA) cluster configuration with one or more standby servers ready to take over operations if the primary server fails. This capability is widely referred to as warm standby or log shipping. The primary and standby server work together to...
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Continuous archiving can be used to create a high availability (HA) cluster configuration with one or more standby servers ready to take over operations if the primary server fails. This capability is widely referred to as warm standby or log shipping. The primary and standby server work together to provide this capability, though the servers are only loosely coupled. The primary server operates in continuous archiving mode, while each standby server operates in continuous recovery mode, reading the WAL files from the primary. No changes to the database tables are required to enable this capability, so it offers low administration overhead compared to some other replication solutions. This configuration also has relatively low performance impact on the primary server. read less
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Your question is not related to Microsoft SQL, please post with PostgreSQL category to get quick answer.
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If you want to retain only WAL segments after the latest base backup, you simply run pg_archivecleanup in standalone mode for the latest .backup file (not for those older than the latest). But do you really want to have only one available backup? First of all, you won't be able to restore to the point...
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If you want to retain only WAL segments after the latest base backup, you simply run pg_archivecleanup in standalone mode for the latest .backup file (not for those older than the latest). But do you really want to have only one available backup? First of all, you won't be able to restore to the point before the last backup. Second, it makes sense to have some backups just in case (corruptions, etc). And it seems strange to archive segments to local disk and then rsync them elsewhere. Why not putting your rsync (and then sync to flush OS buffers to disk) into archive_command? This ensures that the segment won't be removed from pg_xlog before it reaches the destination. read less
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