PostgreSQL学习（1）-- 安装pageinspect extension

1.源码编译

　　pageinspect的源码在postgre源码包的contrib目录下，解压postgre源码包后进入对应的目录。

[root@localhost pageinspect]# pwd
/root/postgresql-11beta2/contrib/pageinspect
[root@localhost pageinspect]# ll
total
-rwxr-xr-x     Jun  : brinfuncs.c
-rwxr-xr-x     Jun  : btreefuncs.c
drwxr-xr-x      Jun  : expected
-rwxr-xr-x      Jun  : fsmfuncs.c
-rwxr-xr-x      Jun  : ginfuncs.c
-rwxr-xr-x     Jun  : hashfuncs.c
-rwxr-xr-x     Jun  : heapfuncs.c
-rwxr-xr-x       Jun  : Makefile
-rwxr-xr-x       Jun  : pageinspect--1.0--1.1.sql
-rwxr-xr-x       Jun  : pageinspect--1.1--1.2.sql
-rwxr-xr-x      Jun  : pageinspect--1.2--1.3.sql
-rwxr-xr-x      Jun  : pageinspect--1.3--1.4.sql
-rwxr-xr-x      Jun  : pageinspect--1.4--1.5.sql
-rwxr-xr-x      Jun  : pageinspect--1.5--1.6.sql
-rwxr-xr-x      Jun  : pageinspect--1.5.sql
-rwxr-xr-x       Jun  : pageinspect--1.6--1.7.sql
-rwxr-xr-x       Jun  : pageinspect.control
-rwxr-xr-x       Jun  : pageinspect.h
-rwxr-xr-x      Jun  : pageinspect--unpackaged--1.0.sql
-rwxr-xr-x      Jun  : rawpage.c
drwxr-xr-x      Jun  : sql

　　有makefile文件，直接用make命令进行编译即可。编译后，只要得到pageinspect.so这个文件。

[root@localhost pageinspect]# ll
total
-rwxr-xr-x      Jun  : brinfuncs.c
-rw-r--r--  root root  Jul  : brinfuncs.o
-rwxr-xr-x      Jun  : btreefuncs.c
-rw-r--r--  root root  Jul  : btreefuncs.o
drwxr-xr-x       Jun  : expected
-rwxr-xr-x       Jun  : fsmfuncs.c
-rw-r--r--  root root   Jul  : fsmfuncs.o
-rwxr-xr-x       Jun  : ginfuncs.c
-rw-r--r--  root root  Jul  : ginfuncs.o
-rwxr-xr-x      Jun  : hashfuncs.c
-rw-r--r--  root root  Jul  : hashfuncs.o
-rwxr-xr-x      Jun  : heapfuncs.c
-rw-r--r--  root root  Jul  : heapfuncs.o
-rwxr-xr-x        Jun  : Makefile
-rwxr-xr-x        Jun  : pageinspect--1.0--1.1.sql
-rwxr-xr-x        Jun  : pageinspect--1.1--1.2.sql
-rwxr-xr-x       Jun  : pageinspect--1.2--1.3.sql
-rwxr-xr-x       Jun  : pageinspect--1.3--1.4.sql
-rwxr-xr-x       Jun  : pageinspect--1.4--1.5.sql
-rwxr-xr-x       Jun  : pageinspect--1.5--1.6.sql
-rwxr-xr-x       Jun  : pageinspect--1.5.sql
-rwxr-xr-x        Jun  : pageinspect--1.6--1.7.sql
-rwxr-xr-x        Jun  : pageinspect.control
-rwxr-xr-x        Jun  : pageinspect.h
-rwxr-xr-x  root root  Jul  : pageinspect.so
-rwxr-xr-x       Jun  : pageinspect--unpackaged--1.0.sql
-rwxr-xr-x       Jun  : rawpage.c
-rw-r--r--  root root   Jul  : rawpage.o
drwxr-xr-x       Jun  : sql

　　然后使用make install命令，把相关文件安装到/usr/localpgsql的目录下。

[root@localhost pageinspect]# make install
/bin/mkdir -p '/usr/local/pgsql/lib'
/bin/mkdir -p '/usr/local/pgsql/share/extension'
/bin/mkdir -p '/usr/local/pgsql/share/extension'
/usr/bin/install -c -m   pageinspect.so '/usr/local/pgsql/lib/pageinspect.so'
/usr/bin/install -c -m  ./pageinspect.control '/usr/local/pgsql/share/extension/'
/usr/bin/install -c -m  ./pageinspect--1.6--1.7.sql ./pageinspect--1.5.sql ./pageinspect--1.5--1.6.sql ./pageinspect--1.4--1.5.sql ./pageinspect--1.3--1.4.sql ./pageinspect--1.2--1.3.sql ./pageinspect--1.1--1.2.sql ./pageinspect--1.0--1.1.sql ./pageinspect--unpackaged--1.0.sql  '/usr/local/pgsql/share/extension/'

2.创建pageinspect extension

　　准备工作完成，然后切换到postgre的用户，进入psql，创建pageinspect extension。

[pguser@localhost log]$ su pguser
Password:
[pguser@localhost log]$ psql -d test
psql (11beta2)
Type "help" for help.

test=# \d pg_extension;
              Table "pg_catalog.pg_extension"
     Column     |  Type   | Collation | Nullable | Default
----------------+---------+-----------+----------+---------
 extname        | name    |           | not null |
 extowner       | oid     |           | not null |
 extnamespace   | oid     |           | not null |
 extrelocatable | boolean |           | not null |
 extversion     | text    |           | not null |
 extconfig      | oid[]   |           |          |
 extcondition   | text[]  |           |          |
Indexes:
    "pg_extension_name_index" UNIQUE, btree (extname)
    "pg_extension_oid_index" UNIQUE, btree (oid)

test=# create extension pageinspect;
CREATE EXTENSION
test=# \d pg_extension;
              Table "pg_catalog.pg_extension"
     Column     |  Type   | Collation | Nullable | Default
----------------+---------+-----------+----------+---------
 extname        | name    |           | not null |
 extowner       | oid     |           | not null |
 extnamespace   | oid     |           | not null |
 extrelocatable | boolean |           | not null |
 extversion     | text    |           | not null |
 extconfig      | oid[]   |           |          |
 extcondition   | text[]  |           |          |
Indexes:
    "pg_extension_name_index" UNIQUE, btree (extname)
    "pg_extension_oid_index" UNIQUE, btree (oid)

test=# select extName from pg_extension;
   extname
-------------
 plpgsql
 pageinspect
( rows)

　　这样就安装成功了。

3.使用pageinspect的函数

　　最后还通过pageinspect的函数，查看table t2的页头信息。

test=# SELECT * FROM page_header(get_raw_page('t2', ));
    lsn    | checksum | flags | lower | upper | special | pagesize | version | prune_xid
-----------+----------+-------+-------+-------+---------+----------+---------+-----------
 /1C3B848 |         |      |     |   |     |      |        |
( row)