版本

# cat /etc/centos-release
CentOS Linux release 7.4.1708 (Core)
#
#
# yum list installed |grep -i postgresql
postgresql10.x86_64                10.11-2PGDG.rhel7                   @pgdg10
postgresql10-contrib.x86_64        10.11-2PGDG.rhel7                   @pgdg10
postgresql10-debuginfo.x86_64      10.11-2PGDG.rhel7                   @pgdg10
postgresql10-devel.x86_64          10.11-2PGDG.rhel7                   @pgdg10
postgresql10-docs.x86_64           10.11-2PGDG.rhel7                   @pgdg10
postgresql10-libs.x86_64           10.11-2PGDG.rhel7                   @pgdg10
postgresql10-odbc.x86_64           12.00.0000-1PGDG.rhel7              @pgdg10
postgresql10-plperl.x86_64         10.11-2PGDG.rhel7                   @pgdg10
postgresql10-plpython.x86_64       10.11-2PGDG.rhel7                   @pgdg10
postgresql10-pltcl.x86_64          10.11-2PGDG.rhel7                   @pgdg10
postgresql10-server.x86_64         10.11-2PGDG.rhel7                   @pgdg10
postgresql10-tcl.x86_64            2.4.0-1.rhel7                       @pgdg10
postgresql10-tcl-debuginfo.x86_64  2.3.1-1.rhel7                       @pgdg10
postgresql10-test.x86_64           10.11-2PGDG.rhel7                   @pgdg10 # su - postgres
Last login: Wed Jan 15 18:34:12 CST 2020 on pts/0
$
$
$ psql -c "select version();"version
----------------------------------------------------------------------------------------------------------PostgreSQL 10.11 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39), 64-bit
(1 row)

下载安装

# su - postgres
$ git clone git://git.osdn.net/gitroot/pgbigm/pg_bigm.git
$ cd pg_bigm/
$ git branch -a
* masterremotes/origin/HEAD -> origin/masterremotes/origin/REL1_0_STABLEremotes/origin/REL1_1_STABLEremotes/origin/REL1_2_STABLEremotes/origin/master$ git checkout -b REL1_2_STABLE
$ make USE_PGXS=1 PG_CONFIG=/usr/pgsql-10/bin/pg_config
$ exit;# cd /var/lib/pgsql/pg_bigm/
# make USE_PGXS=1 PG_CONFIG=/usr/pgsql-10/bin/pg_config install/bin/mkdir -p '/usr/pgsql-10/lib'
/bin/mkdir -p '/usr/pgsql-10/share/extension'
/bin/mkdir -p '/usr/pgsql-10/share/extension'
/bin/install -c -m 755  pg_bigm.so '/usr/pgsql-10/lib/pg_bigm.so'
/bin/install -c -m 644 .//pg_bigm.control '/usr/pgsql-10/share/extension/'
/bin/install -c -m 644 .//pg_bigm--1.2.sql .//pg_bigm--1.1--1.2.sql .//pg_bigm--1.0--1.1.sql  '/usr/pgsql-10/share/extension/'

创建 pg_bigm

# vi /var/lib/pgsql/10/data/postgresql.confshared_preload_libraries ='pg_bigm'# systemctl restart postgresql-10.service

# su - postgres
$ psqlpostgres=# create extension pg_bigm;postgres=# \dxList of installed extensionsName             | Version |   Schema   |                                                     Description                          ------------------------------+---------+------------+------------------------------------------------------------------------------------------pg_bigm                      | 1.2     | public     | text similarity measurement and index searching based on bigramsplpgsql                      | 1.0     | pg_catalog | PL/pgSQL procedural language
(2 rows)postgres=# select show_bigm('this is pg_bigm extension');show_bigm
-----------------------------------------------------------------------------------------{" e"," i"," p"," t",_b,bi,en,ex,g_,gm,hi,ig,io,is,"m ","n ",ns,on,pg,"s ",si,te,th,xt}
(1 row)

初步使用

postgres=# create table tmp_t0(id bigint,name varchar(100),memo varchar(100)
);postgres=# insert into tmp_t0
select id,md5(id::varchar) as name,md5(md5(id::varchar) ) as memo
from generate_series(1,1000000) as id; postgres=# create index idx_tmp_t0_name on tmp_t0 using gin(name gin_bigm_ops);

postgres=# explain select * from tmp_t0 where name like '%uuu%';QUERY PLAN
---------------------------------------------------------------------------------Bitmap Heap Scan on tmp_t0  (cost=24.77..400.04 rows=100 width=74)Recheck Cond: ((name)::text ~~ '%uuu%'::text)->  Bitmap Index Scan on idx_tmp_t0_name  (cost=0.00..24.75 rows=100 width=0)Index Cond: ((name)::text ~~ '%uuu%'::text)
(4 rows)

postgres=# explain select * from tmp_t0 where name like '%uu%';QUERY PLAN
---------------------------------------------------------------------------------Bitmap Heap Scan on tmp_t0  (cost=24.77..400.04 rows=100 width=74)Recheck Cond: ((name)::text ~~ '%uu%'::text)->  Bitmap Index Scan on idx_tmp_t0_name  (cost=0.00..24.75 rows=100 width=0)Index Cond: ((name)::text ~~ '%uu%'::text)
(4 rows)

postgres=# explain select * from tmp_t0 where name like '%u%';QUERY PLAN
-----------------------------------------------------------------------------------Bitmap Heap Scan on tmp_t0  (cost=1732.78..2108.04 rows=100 width=74)Recheck Cond: ((name)::text ~~ '%u%'::text)->  Bitmap Index Scan on idx_tmp_t0_name  (cost=0.00..1732.75 rows=100 width=0)Index Cond: ((name)::text ~~ '%u%'::text)
(4 rows)

优秀

参考:
https://pgbigm.osdn.jp/index_en.html
https://pgbigm.osdn.jp/pg_bigm_en-1-2.html

http://git.osdn.net/view?p=pgbigm/pg_bigm.git;a=summary
git://git.osdn.net/gitroot/pgbigm/pg_bigm.git

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pg_bigm 处理中间模糊匹配 like ‘%xxoo%‘

版本

下载安装

创建 pg_bigm

初步使用

pg_bigm 处理中间模糊匹配 like ‘%xxoo%‘相关推荐

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