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postgresql/src/include/access
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Tom Lane 2a67d6440d Add commentary explaining why MaxIndexTuplesPerPage calculation is safe. 
MaxIndexTuplesPerPage ignores the fact that btree indexes sometimes
store tuples with no data payload.  But it also ignores the possibility
of "special space" on index pages, which offsets that, so that the
result isn't an underestimate.  This all seems worth documenting, though.

In passing, remove #define MinIndexTupleSize, which was added by
commit 2c03216d8 but not used in that commit nor later ones.

Comment text by me; issue noticed by Peter Geoghegan.

Discussion: https://postgr.es/m/CAH2-WzkQmb54Kbx-YHXstRKXcNc+_87jwV3DRb54xcybLR7Oig@mail.gmail.com
 		2018-04-14 12:33:15 -04:00
..
amapi.h Support index INCLUDE in the AM properties interface. 2018-04-08 06:02:05 +01:00
amvalidate.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
attnum.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin_internal.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin_page.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin_pageops.h Improve FSM management for BRIN indexes. 2018-04-04 14:26:04 -04:00
brin_revmap.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin_tuple.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
brin_xlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
bufmask.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
clog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
commit_ts.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
genam.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
generic_xlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
gin.h Use stdbool.h if suitable 2018-03-22 20:42:25 -04:00
gin_private.h Predicate locking in GIN index 2018-03-30 14:23:17 +03:00
ginblock.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
ginxlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
gist.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
gist_private.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
gistscan.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
gistxlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
hash.h Indexes with INCLUDE columns and their support in B-tree 2018-04-07 23:00:39 +03:00
hash_xlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
heapam.h Revert MERGE patch 2018-04-12 11:22:56 +01:00
heapam_xlog.h Raise error when affecting tuple moved into different partition. 2018-04-07 13:24:27 -07:00
hio.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
htup.h Add FIELDNO_* macro designating offset into structs required for JIT. 2018-03-22 14:45:59 -07:00
htup_details.h Raise error when affecting tuple moved into different partition. 2018-04-07 13:24:27 -07:00
itup.h Add commentary explaining why MaxIndexTuplesPerPage calculation is safe. 2018-04-14 12:33:15 -04:00
multixact.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
nbtree.h Indexes with INCLUDE columns and their support in B-tree 2018-04-07 23:00:39 +03:00
nbtxlog.h Indexes with INCLUDE columns and their support in B-tree 2018-04-07 23:00:39 +03:00
parallel.h Support parallel btree index builds. 2018-02-02 13:32:44 -05:00
printsimple.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
printtup.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
reloptions.h Allow HOT updates for some expression indexes 2018-03-27 19:57:02 +01:00
relscan.h Support parallel btree index builds. 2018-02-02 13:32:44 -05:00
rewriteheap.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
rmgr.h Phase 2 of pgindent updates. 2017-06-21 15:19:25 -04:00
rmgrlist.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
sdir.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
session.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
skey.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
slru.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
spgist.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
spgist_private.h Prevent query-lifespan memory leakage of SP-GiST traversal values. 2018-03-19 23:59:30 -04:00
spgxlog.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
stratnum.h Add prefix operator for TEXT type. 2018-04-03 19:46:45 +03:00
subtrans.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
sysattr.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
timeline.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
transam.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
tsmapi.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
tupconvert.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
tupdesc.h Fast ALTER TABLE ADD COLUMN with a non-NULL default 2018-03-28 10:43:52 +10:30
tupdesc_details.h Fast ALTER TABLE ADD COLUMN with a non-NULL default 2018-03-28 10:43:52 +10:30
tupmacs.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
tuptoaster.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
twophase.h Store 2PC GID in commit/abort WAL recs for logical decoding 2018-03-28 17:42:50 +01:00
twophase_rmgr.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
valid.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
visibilitymap.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
xact.h Store 2PC GID in commit/abort WAL recs for logical decoding 2018-03-28 17:42:50 +01:00
xlog.h Revert "Allow on-line enabling and disabling of data checksums" 2018-04-09 19:03:42 +02:00
xlog_internal.h Revert "Allow on-line enabling and disabling of data checksums" 2018-04-09 19:03:42 +02:00
xlogdefs.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
xloginsert.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
xlogreader.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
xlogrecord.h Update copyright for 2018 2018-01-02 23:30:12 -05:00
xlogutils.h Update copyright for 2018 2018-01-02 23:30:12 -05:00