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Update HINT for pre-existing shared memory block.

One should almost always terminate an old process, not use a manualremoval tool like ipcrm. Removal of the ipcclean script eleven yearsago (39627b1) and its non-replacementcorroborate that manual shm removal is now a niche goal. Back-patch to9.4 (all supported versions).Reviewed by Daniel Gustafsson and Kyotaro HORIGUCHI.Discussion:https://postgr.es/m/20180812064815.GB2301738@rfd.leadboat.com

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src/backend/utils/init
- miscinit.c

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`‎src/backend/utils/init/miscinit.c`

Lines changed: 3 additions & 7 deletions

Original file line number	Diff line number	Diff line change
`@@ -974,14 +974,10 @@ CreateLockFile(const char *filename, bool amPostmaster,`
`974`	`974`	`if (PGSharedMemoryIsInUse(id1,id2))`
`975`	`975`	`ereport(FATAL,`
`976`	`976`	`(errcode(ERRCODE_LOCK_FILE_EXISTS),`
`977`		`-errmsg("pre-existing shared memory block "`
`978`		`-"(key %lu, ID %lu) is still in use",`
	`977`	`+errmsg("pre-existing shared memory block (key %lu, ID %lu) is still in use",`
`979`	`978`	`id1,id2),`
`980`		`-errhint("If you're sure there are no old "`
`981`		`-"server processes still running, remove "`
`982`		`-"the shared memory block "`
`983`		`-"or just delete the file \"%s\".",`
`984`		`-filename)));`
	`979`	`+errhint("Terminate any old server processes associated with data directory \"%s\".",`
	`980`	`+refName)));`
`985`	`981`	`}`
`986`	`982`	`}`
`987`	`983`

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Commit3273994

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`‎src/backend/utils/init/miscinit.c`

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