>Description:
When I query using
"SELECT d1.document_id as document_id_1, d2.document_id as document_id_2,
sum(d1.weight * d2.weight) as similarity FROM dw_merge as d1 INNER JOIN dw_merge as d2
ON d1.word_id=d2.word_id WHERE d1.document_id=5 AND d1.weight > 0.05 AND d2.weight >
0.05 GROUP BY document_id_1, document_id_2 ORDER BY similarity DESC limit 0,50;"
dw_merge table is a MERGE table, it reference to 100 tables.
The total number of records of the 100 tables is about 400,000 records.
>How-To-Repeat:
the table schema of the 100 tables is
"CREATE TABLE document_word (
document_id int(11) DEFAULT '0' NOT NULL,
word_id int(11) DEFAULT '0' NOT NULL,
freq int(6) DEFAULT '0' NOT NULL,
weight float(7,5) DEFAULT '0.00000' NOT NULL,
PRIMARY KEY (document_id, word_id),
KEY word_id (word_id),
KEY document_id (document_id),
KEY weight (weight)
);"
>Fix:
>Submitter-Id: <submitter ID>
>Originator: Herb Jiang
>Organization:
>MySQL support: [none | licence | email support | extended email support ]
>Synopsis:
>Severity:
>Priority:
>Category: mysql
>Class:
>Release: mysql-4.0.1-alpha (Official MySQL RPM)
>Server: /usr/bin/mysqladmin Ver 8.23 Distrib 4.0.1-alpha, for pc-linux-gnu on i686
Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL license
Server version 4.0.1-alpha
Protocol version 10
Connection Localhost via UNIX socket
UNIX socket /var/lib/mysql/mysql.sock
Uptime: 18 min 28 sec
Threads: 2 Questions: 136 Slow queries: 0 Opens: 137 Flush tables: 1 Open tables:
130 Queries per second avg: 0.123
>Environment:
System: Linux herb-nb 2.4.14-2HJ #6 週四 11月 15 21:42:14 CST 2001 i686 pld
Architecture: i686
Some paths: /usr/bin/perl /usr/bin/make /usr/bin/gmake /usr/bin/gcc /usr/bin/cc
GCC: Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-99)
Compilation info: CC='gcc' CFLAGS='-O6 -fno-omit-frame-pointer -mpentium' CXX='gcc'
CXXFLAGS='-O6 -fno-omit-frame-pointer -felide-constructors
-fno-exceptions -fno-rtti -mpentium' LDFLAGS=''
LIBC:
lrwxrwxrwx 1 root root 13 12月 14 10:58 /lib/libc.so.6 ->
libc-2.2.4.so
-rwxr-xr-x 1 root root 1290876 10月 13 02:30 /lib/libc-2.2.4.so
-rw-r--r-- 1 root root 27316592 10月 13 02:17 /usr/lib/libc.a
-rw-r--r-- 1 root root 178 10月 13 02:17 /usr/lib/libc.so
Configure command: ./configure --disable-shared --with-mysqld-ldflags=-all-static
--with-client-ldflags=-all-static --without-berkeley-db --with-innodb
--enable-assembler --with-mysqld-user=mysql
--with-unix-socket-path=/var/lib/mysql/mysql.sock --prefix=/
--with-extra-charsets=complex --exec-prefix=/usr --libexecdir=/usr/sbin
--sysconfdir=/etc --datadir=/usr/share --localstatedir=/var/lib/mysql
--infodir=/usr/info --includedir=/usr/include --mandir=/usr/man --with-embedded-server
--enable-thread-safe-client '--with-comment=Official MySQL RPM'
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