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Fujii Masao 8d9a935965 Add pg_stat_wal statistics view. 
This view shows the statistics about WAL activity. Currently it has only
two columns: wal_buffers_full and stats_reset. wal_buffers_full column
indicates the number of times WAL data was written to the disk because
WAL buffers got full. This information is useful when tuning wal_buffers.
stats_reset column indicates the time at which these statistics were
last reset.

pg_stat_wal view is also the basic infrastructure to expose other
various statistics about WAL activity later.

Bump PGSTAT_FILE_FORMAT_ID due to the change in pgstat format.

Bump catalog version.

Author: Masahiro Ikeda
Reviewed-by: Takayuki Tsunakawa, Kyotaro Horiguchi, Amit Kapila, Fujii Masao
Discussion: https://postgr.es/m/188bd3f2d2233cf97753b5ced02bb050@oss.nttdata.com
2020-10-02 10:17:11 +09:00
..
editors Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
findoidjoins Move connect.h from fe_utils to src/include/common. 2020-08-10 09:22:54 -07:00
ifaddrs Update copyrights for 2020 2020-01-01 12:21:45 -05:00
make_diff Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
msvc Skip unnecessary stat() calls in walkdir(). 2020-09-07 18:28:06 +12:00
perlcheck Stop requiring an explicit return from perl subroutines 2020-04-14 16:55:34 -04:00
pginclude Use perl warnings pragma consistently 2020-04-13 11:55:45 -04:00
pgindent Add pg_stat_wal statistics view. 2020-10-02 10:17:11 +09:00
ccsym tools/ccsym: update for modern versions of gcc 2015-01-20 13:02:58 -05:00
check_bison_recursion.pl Update copyrights for 2020 2020-01-01 12:21:45 -05:00
codelines Fix remaining stray references to CVS. 2010-09-22 19:51:39 -04:00
copyright.pl Remove libpq.rc, use win32ver.rc for libpq 2020-01-15 15:06:12 +01:00
find_badmacros Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
find_static Fix omission of -X (--no-psqlrc) in some psql invocations. 2015-12-28 11:46:43 -05:00
find_typedef Refer to OS X as "macOS", except for the port name which is still "darwin". 2016-09-25 15:40:57 -04:00
fix-old-flex-code.pl Use perl warnings pragma consistently 2020-04-13 11:55:45 -04:00
gen_keywordlist.pl Update copyrights for 2020 2020-01-01 12:21:45 -05:00
git-external-diff Preserve information on use of git-external-diff 2018-05-24 23:45:31 +09:30
git_changelog Stamp HEAD as 14devel. 2020-06-07 17:16:30 -04:00
make_ctags Improve missing-program error handling in make_ctags and make_etags. 2019-01-13 13:33:50 -05:00
make_etags Improve missing-program error handling in make_ctags and make_etags. 2019-01-13 13:33:50 -05:00
make_mkid Add another pgdefine path check, and a cvs-git change. 2011-08-26 21:52:35 -04:00
PerfectHash.pm Update copyrights for 2020 2020-01-01 12:21:45 -05:00
pgtest pgtest: run clean, build, and check stages separately 2018-07-28 15:34:06 -04:00
RELEASE_CHANGES Update oidjoins regression test for v13. 2020-05-09 13:05:08 -04:00
testint128.c Update copyrights for 2020 2020-01-01 12:21:45 -05:00
valgrind.supp Avoid need for valgrind suppressions for pg_atomic_init_u64 on some platforms. 2020-06-08 19:52:19 -07:00
version_stamp.pl Rename configure.in to configure.ac 2020-07-24 10:42:08 +02:00
win32tzlist.pl Update Windows timezone name list to include currently-known zones. 2020-04-24 17:53:23 -04:00