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Improve documentation of data_sync_retry

Reflecting an updated parameter value requires a server restart, whichwas not mentioned in the documentation and in postgresql.conf.sample.Reported-by: Thomas PotyDiscussion:https://postgr.es/m/15659-0cd812f13027a2d8@postgresql.org

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doc/src/sgml
- config.sgml
src/backend/utils/misc
- postgresql.conf.sample

2 files changed

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`‎doc/src/sgml/config.sgml`

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -8145,7 +8145,8 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'`
`8145`	`8145`	`<para>`
`8146`	`8146`	`When set to false, which is the default, <productname>PostgreSQL</productname>`
`8147`	`8147`	`will raise a PANIC-level error on failure to flush modified data files`
`8148`		`- to the filesystem. This causes the database server to crash.`
	`8148`	`+ to the filesystem. This causes the database server to crash. This`
	`8149`	`+ parameter can only be set at server start.`
`8149`	`8150`	`</para>`
`8150`	`8151`	`<para>`
`8151`	`8152`	`On some operating systems, the status of data in the kernel's page`

`‎src/backend/utils/misc/postgresql.conf.sample`

Lines changed: 3 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -665,7 +665,9 @@`
`665`	`665`
`666`	`666`	`#exit_on_error = off# terminate session on any error?`
`667`	`667`	`#restart_after_crash = on# reinitialize after backend crash?`
`668`		`-#data_sync_retry = off# retry or panic on failure to fsync data?`
	`668`	`+#data_sync_retry = off# retry or panic on failure to fsync`
	`669`	`+# data?`
	`670`	`+# (change requires restart)`
`669`	`671`
`670`	`672`
`671`	`673`	`#------------------------------------------------------------------------------`

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Commit0bf7f56

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2 files changed

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`‎doc/src/sgml/config.sgml`

`‎src/backend/utils/misc/postgresql.conf.sample`

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