From f7e4989d1c65c376ca4aba2d39dc81cd1eaefe67 Mon Sep 17 00:00:00 2001 From: Peter Geoghegan Date: Sat, 20 Jun 2020 17:34:06 -0700 Subject: [PATCH] Doc: Tweak description of B-Tree duplicate tuples. Defining duplicates as "close by" to each other was unclear. Simplify the definition. Backpatch: 13-, where deduplication was introduced (by commit 0d861bbb) --- doc/src/sgml/btree.sgml | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/doc/src/sgml/btree.sgml b/doc/src/sgml/btree.sgml index 661e7ab650..4f1438d522 100644 --- a/doc/src/sgml/btree.sgml +++ b/doc/src/sgml/btree.sgml @@ -635,10 +635,10 @@ options(relopts local_relopts *) returns A duplicate is a leaf page tuple (a tuple that points to a table row) where all indexed key columns have values that match corresponding column values from at least one other leaf - page tuple that's close by in the same index. Duplicate tuples are - quite common in practice. B-Tree indexes can use a special, - space-efficient representation for duplicates when an optional - technique is enabled: deduplication. + page tuple in the same index. Duplicate tuples are quite common in + practice. B-Tree indexes can use a special, space-efficient + representation for duplicates when an optional technique is + enabled: deduplication. Deduplication works by periodically merging groups of duplicate