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Document that effective cache size does not assume data remains in the

cache between queries.

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Original file line number	Diff line number	Diff line change
`@@ -2424,7 +2424,9 @@ SET ENABLE_SEQSCAN TO OFF;`
`2424`	`2424`	`space. This parameter has no effect on the size of shared`
`2425`	`2425`	`memory allocated by <productname>PostgreSQL</productname>, nor`
`2426`	`2426`	`does it reserve kernel disk cache; it is used only for estimation`
`2427`		`- purposes. The default is 128 megabytes (<literal>128MB</>).`
	`2427`	`+ purposes. The system also does not assume data remains in`
	`2428`	`+ the disk cache between queries. The default is 128 megabytes`
	`2429`	`+ (<literal>128MB</>).`
`2428`	`2430`	`</para>`
`2429`	`2431`	`</listitem>`
`2430`	`2432`	`</varlistentry>`

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