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Update FAQ.

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`@@ -900,6 +900,10 @@ BYTEA bytea variable-length array of bytes`
`900`	`900`	`DELETE FROM new;`
`901`	`901`	`COPY new WITH OIDS FROM '/tmp/pgtable';`
`902`	`902`
	`903`	`+ OIDs are stored as 4-byte integers, and will overflow at 4 billion. No`
	`904`	`+ one has reported this every happening, and we plan to have the limit`
	`905`	`+ removed before anyone does.`
	`906`	`+`
`903`	`907`	`TIDs are used to identify specific physical rows with block and offset`
`904`	`908`	`values. Tids change after rows are modified or reloaded. They are used`
`905`	`909`	`by index entries to point to physical rows.`

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`@@ -1095,6 +1095,10 @@ <H4><A NAME="4.17">4.17</A>) What is an <small>OID</small>? What is a`
`1095`	`1095`	`-->`
`1096`	`1096`	`</PRE><P>`
`1097`	`1097`
	`1098`	`+O<small>ID</small>s are stored as 4-byte integers, and will overflow`
	`1099`	`+at 4 billion. No one has reported this every happening, and we plan to`
	`1100`	`+have the limit removed before anyone does.<P>`
	`1101`	`+`
`1098`	`1102`	`T<small>ID</small>s are used to identify specific physical rows with block and offset`
`1099`	`1103`	`values. Tids change after rows are modified or reloaded. They are used`
`1100`	`1104`	`by index entries to point to physical rows.<P>`

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