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Postgres FD Implementation
Commit ed7f37b7 authored by Bruce Momjian's avatar Bruce Momjian
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Add to DROP todo.

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This is an implementation of RD-tree data structure using GiST interface
of PostgreSQL. It has built-in lossy compression - must be declared
in index creation - with (islossy). Current implementation has index support
for one-dimensional array of int4's.
All works was done by Teodor Sigaev (teodor@stack.net) and Oleg Bartunov
(oleg@sai.msu.su).
INSTALLATION:
gmake
gmake install
-- load functions
psql <database> < _int.sql
EXAMPLE USAGE:
create table message (mid int not null,sections int[]);
create table message_section_map (mid int not null,sid int not null);
-- create indices
CREATE unique index message_key on message ( mid );
CREATE unique index message_section_map_key2 on message_section_map (sid, mid );
CREATE INDEX message_rdtree_idx on message using gist ( sections ) with ( islossy );
-- select some messages with section in 1 OR 2 - OVERLAP operator
select message.mid from message where message.sections && '{1,2}';
-- select messages contains in sections 1 AND 2 - CONTAINS operator
select message.mid from message where message.sections @ '{1,2}';
-- the same, CONTAINED operator
select message.mid from message where '{1,2}' ~ message.sections;
TEST:
subdirectory test contains test suite.
cd ./test
1. createdb TEST
2. psql TEST < ../_int.sql
3. ./create_test.pl | psql TEST
4. ./bench.pl - perl script to benchmark queries, supports OR, AND queries
with/without RD-Tree. Run script without arguments to
see availbale options.
a)test without RD-Tree (OR)
./bench.pl -d TEST -s 1,2 -v
b)test with RD-Tree
./bench.pl -d TEST -s 1,2 -v -r
BENCHMARKS:
Size of table <message>: 200000
Size of table <message_section_map>: 268538
Distribution of messages by sections:
section 0: 73899 messages
section 1: 16298 messages
section 50: 1241 messages
section 99: 705 messages
old - without RD-Tree support,
new - with RD-Tree
+----------+---------------+----------------+
|Search set|OR, time in sec|AND, time in sec|
| +-------+-------+--------+-------+
| | old | new | old | new |
+----------+-------+-------+--------+-------+
| 1| 1.427| 0.215| -| -|
+----------+-------+-------+--------+-------+
| 99| 1.029| 0.018| -| -|
+----------+-------+-------+--------+-------+
| 1,2| 1.829| 0.334| 5.654| 0.042|
+----------+-------+-------+--------+-------+
| 1,2,50,60| 2.057| 0.359| 5.044| 0.007|
+----------+-------+-------+--------+-------+
doc/TODO.detail/drop
View file @ ed7f37b7
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......@@ -720,3 +720,61 @@ Regards.
Hiroshi Inoue
Inoue@tpf.co.jp
From pgsql-hackers-owner+M3050@postgresql.org Thu Jan 11 21:49:43 2001
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Date: Thu, 11 Jan 2001 18:48:36 PST
From: Jeff Davis <jdavis@dynworks.com>
To: pgsql-hackers@postgresql.org
Subject: [HACKERS] alter table drop column
Reply-To: jdavis@dynworks.com
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Status: OR
I read the transcript of the alter table drop column discussion (old
discussion) at http://www.postgresql.org/docs/pgsql/doc/TODO.detail/drop,
and I have something to add:
People mentioned such ideas as a hidden column and a really deleted column,
and it occurred to me that perhaps "vacuum" would be a good option to use.
When a delete was issued, the column would be hidden (by a negative/invalid
logical column number, it appears was the consensus). Upon issuing a
vacuum, it could perform a complete deletion. This method would allow users
to know that the process may take a while (I think the agreed method for a
complete delete was to "select into..." the right columns and leave out the
deleted ones, then delete the old table).
Furthermore, I liked the idea of some kind of "undelete", as long as it was
just hidden. This could apply to anything that is cleaned out with a vacuum
(before it is cleaned out), although I am not sure how feasible this is,
and it isn't particularly important to me.
Regards,
Jeff
--
Jeff Davis
Dynamic Works
jdavis@dynworks.com
http://dynworks.com
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