Add to DROP todo.
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Bruce Momjian
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contrib/intarray/README
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76
contrib/intarray/README
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This is an implementation of RD-tree data structure using GiST interface
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of PostgreSQL. It has built-in lossy compression - must be declared
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in index creation - with (islossy). Current implementation has index support
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for one-dimensional array of int4's.
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All works was done by Teodor Sigaev (teodor@stack.net) and Oleg Bartunov
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(oleg@sai.msu.su).
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INSTALLATION:
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gmake
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gmake install
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-- load functions
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psql <database> < _int.sql
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EXAMPLE USAGE:
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create table message (mid int not null,sections int[]);
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create table message_section_map (mid int not null,sid int not null);
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-- create indices
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CREATE unique index message_key on message ( mid );
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CREATE unique index message_section_map_key2 on message_section_map (sid, mid );
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CREATE INDEX message_rdtree_idx on message using gist ( sections ) with ( islossy );
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-- select some messages with section in 1 OR 2 - OVERLAP operator
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select message.mid from message where message.sections && '{1,2}';
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-- select messages contains in sections 1 AND 2 - CONTAINS operator
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select message.mid from message where message.sections @ '{1,2}';
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-- the same, CONTAINED operator
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select message.mid from message where '{1,2}' ~ message.sections;
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TEST:
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subdirectory test contains test suite.
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cd ./test
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1. createdb TEST
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2. psql TEST < ../_int.sql
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3. ./create_test.pl | psql TEST
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4. ./bench.pl - perl script to benchmark queries, supports OR, AND queries
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with/without RD-Tree. Run script without arguments to
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see availbale options.
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a)test without RD-Tree (OR)
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./bench.pl -d TEST -s 1,2 -v
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b)test with RD-Tree
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./bench.pl -d TEST -s 1,2 -v -r
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BENCHMARKS:
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Size of table <message>: 200000
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Size of table <message_section_map>: 268538
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Distribution of messages by sections:
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section 0: 73899 messages
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section 1: 16298 messages
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section 50: 1241 messages
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section 99: 705 messages
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old - without RD-Tree support,
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new - with RD-Tree
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+----------+---------------+----------------+
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|Search set|OR, time in sec|AND, time in sec|
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| +-------+-------+--------+-------+
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| | old | new | old | new |
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+----------+-------+-------+--------+-------+
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| 1| 1.427| 0.215| -| -|
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+----------+-------+-------+--------+-------+
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| 99| 1.029| 0.018| -| -|
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+----------+-------+-------+--------+-------+
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| 1,2| 1.829| 0.334| 5.654| 0.042|
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+----------+-------+-------+--------+-------+
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| 1,2,50,60| 2.057| 0.359| 5.044| 0.007|
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+----------+-------+-------+--------+-------+
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@ -720,3 +720,61 @@ Regards.
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Hiroshi Inoue
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Inoue@tpf.co.jp
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Date: Thu, 11 Jan 2001 18:48:36 PST
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From: Jeff Davis <jdavis@dynworks.com>
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To: pgsql-hackers@postgresql.org
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Subject: [HACKERS] alter table drop column
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Status: OR
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I read the transcript of the alter table drop column discussion (old
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discussion) at http://www.postgresql.org/docs/pgsql/doc/TODO.detail/drop,
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and I have something to add:
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People mentioned such ideas as a hidden column and a really deleted column,
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and it occurred to me that perhaps "vacuum" would be a good option to use.
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When a delete was issued, the column would be hidden (by a negative/invalid
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logical column number, it appears was the consensus). Upon issuing a
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vacuum, it could perform a complete deletion. This method would allow users
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to know that the process may take a while (I think the agreed method for a
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complete delete was to "select into..." the right columns and leave out the
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deleted ones, then delete the old table).
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Furthermore, I liked the idea of some kind of "undelete", as long as it was
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just hidden. This could apply to anything that is cleaned out with a vacuum
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(before it is cleaned out), although I am not sure how feasible this is,
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and it isn't particularly important to me.
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Regards,
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Jeff
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--
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Jeff Davis
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Dynamic Works
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jdavis@dynworks.com
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http://dynworks.com
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