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| author | Peter Geoghegan <pg@bowt.ie> | 2020-06-20 17:34:06 -0700 |
|---|---|---|
| committer | Peter Geoghegan <pg@bowt.ie> | 2020-06-20 17:34:06 -0700 |
| commit | f7e4989d1c65c376ca4aba2d39dc81cd1eaefe67 (patch) | |
| tree | b410d5e6d0a626b0308d228e2eaead42268ea9a0 | |
| parent | b56d91ebd2bef20f9adbcc61c1279083a91bdf3e (diff) | |
| download | postgresql-f7e4989d1c65c376ca4aba2d39dc81cd1eaefe67.tar.gz postgresql-f7e4989d1c65c376ca4aba2d39dc81cd1eaefe67.zip | |
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)
| -rw-r--r-- | doc/src/sgml/btree.sgml | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/doc/src/sgml/btree.sgml b/doc/src/sgml/btree.sgml index 661e7ab6503..4f1438d522d 100644 --- a/doc/src/sgml/btree.sgml +++ b/doc/src/sgml/btree.sgml @@ -635,10 +635,10 @@ options(<replaceable>relopts</replaceable> <type>local_relopts *</type>) returns A duplicate is a leaf page tuple (a tuple that points to a table row) where <emphasis>all</emphasis> 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: <firstterm>deduplication</firstterm>. + 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: <firstterm>deduplication</firstterm>. </para> <para> Deduplication works by periodically merging groups of duplicate |