From df3b181499b40523bd6244a4e5eb554acb9020ce Mon Sep 17 00:00:00 2001
From: Amit Kapila
Date: Sat, 4 Apr 2020 10:02:08 +0530
Subject: Add infrastructure to track WAL usage.

This allows gathering the WAL generation statistics for each statement
execution.  The three statistics that we collect are the number of WAL
records, the number of full page writes and the amount of WAL bytes
generated.

This helps the users who have write-intensive workload to see the impact
of I/O due to WAL.  This further enables us to see approximately what
percentage of overall WAL is due to full page writes.

In the future, we can extend this functionality to allow us to compute the
the exact amount of WAL data due to full page writes.

This patch in itself is just an infrastructure to compute WAL usage data.
The upcoming patches will expose this data via explain, auto_explain,
pg_stat_statements and verbose (auto)vacuum output.

Author: Kirill Bychik, Julien Rouhaud
Reviewed-by: Dilip Kumar, Fujii Masao and Amit Kapila
Discussion: https://postgr.es/m/CAB-hujrP8ZfUkvL5OYETipQwA=e3n7oqHFU=4ZLxWS_Cza3kQQ@mail.gmail.com
---
 src/tools/pgindent/typedefs.list | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/tools')

diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 939de985d32..34623523a70 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -2643,6 +2643,7 @@ WalSndCtlData
 WalSndSendDataCallback
 WalSndState
 WalTimeSample
+WalUsage
 WalWriteMethod
 Walfile
 WindowAgg
-- 
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