Use pageinspect EXTENSION view PostgreSQL Page’s raw infomation
背景
之前介绍过一个pg_filedump的外部命令，是用来查看PostgreSQL数据库存储底层的信息的。
链接:
http://blog.163.com/digoal@126/blog/static/163877040201142610215685/
今天再介绍一个PostgreSQL的EXTENSION，也可以用来查看PostgreSQL数据库存储底层的东西。
digoal=> \c digoal postgres
You are now connected to database "digoal" as user "postgres".
digoal=# create extension pageinspect;
CREATE EXTENSION
Time: 4.259 ms
digoal=# \c digoal digoal
You are now connected to database "digoal" as user "digoal".
digoal=> insert into tbl_user_info select generate_series(1,10000),'zhou','digoal','sky-mobi';
INSERT 0 10000
Time: 19.679 ms
digoal=> select max(ctid) from tbl_user_info;
max
---------
(73,72)
(1 row)
74个PAGE
注意只有超级用户可以执行,普通用户执行将报权限不足的错误。
digoal=> select * from get_raw_page('tbl_user_info',0);
ERROR: must be superuser to use raw functions
获得一个PAGE的bytea内容，可以使用get_raw_page函数。bytea的输出可以是escape或hex模式。
如
digoal=> \c digoal postgres
You are now connected to database "digoal" as user "postgres".
digoal=# set bytea_output='hex';
SET
digoal=# select * from get_raw_page('tbl_user_info',0);
返回结果类似如下
此处省略N字
0000000550700000000000000000000000000000600040002091800060000000b7a686f750f6469676f616c13736b792d6d6f6269000000000000005507000000000
00000000000000000000500040002091800050000000b7a686f750f6469676f616c13736b792d6d6f626900000000000000550700000000000000000000000000000
400040002091800040000000b7a686f750f6469676f616c13736b792d6d6f62690000000000000055070000000000000000000000000000030004000209180003000
0000b7a686f750f6469676f616c13736b792d6d6f626900000000000000550700000000000000000000000000000200040002091800020000000b7a686f750f64696
76f616c13736b792d6d6f626900000000000000550700000000000000000000000000000100040002091800010000000b7a686f750f6469676f616c13736b792d6d6
f626900000000000000
(1 row)
修改输出格式后
digoal=# set bytea_output='escape';
SET
结果类似如下
\000\002\011\030\000\011\000\000\000\013zhou\017digoal\023sky-mobi\000\000\000\000\000\000\000U\007\000\000\000\000\000\000\000\000\
000\000\000\000\000\000\010\000\004\000\002\011\030\000\010\000\000\000\013zhou\017digoal\023sky-mobi\000\000\000\000\000\000\000U\0
07\000\000\000\000\000\000\000\000\000\000\000\000\000\000\007\000\004\000\002\011\030\000\007\000\000\000\013zhou\017digoal\023sky-
mobi\000\000\000\000\000\000\000U\007\000\000\000\000\000\000\000\000\000\000\000\000\000\000\006\000\004\000\002\011\030\000\006\00
0\000\000\013zhou\017digoal\023sky-mobi\000\000\000\000\000\000\000U\007\000\000\000\000\000\000\000\000\000\000\000\000\000\000\005
\000\004\000\002\011\030\000\005\000\000\000\013zhou\017digoal\023sky-mobi\000\000\000\000\000\000\000U\007\000\000\000\000\000\000\
000\000\000\000\000\000\000\000\004\000\004\000\002\011\030\000\004\000\000\000\013zhou\017digoal\023sky-mobi\000\000\000\000\000\00
0\000U\007\000\000\000\000\000\000\000\000\000\000\000\000\000\000\003\000\004\000\002\011\030\000\003\000\000\000\013zhou\017digoal
\023sky-mobi\000\000\000\000\000\000\000U\007\000\000\000\000\000\000\000\000\000\000\000\000\000\000\002\000\004\000\002\011\030\00
0\002\000\000\000\013zhou\017digoal\023sky-mobi\000\000\000\000\000\000\000U\007\000\000\000\000\000\000\000\000\000\000\000\000\000
\000\001\000\004\000\002\011\030\000\001\000\000\000\013zhou\017digoal\023sky-mobi\000\000\000\000\000\000\000
这里查询到得是一个MAIN PAGE的RAW内容。
另外还可以查询fsm , vm page的内容。具体的数据结构描述可以参考源代码。
另外还有几个函数如
get_raw_page(relname text, blkno int) returns bytea
get_raw_page(relname text, fork text, blkno int) returns bytea
fork取值范围 main , fsm , vm
查看一个PAGE的头部信息：（数据结构参考源代码）
digoal=# select * from page_header(get_raw_page('tbl_user_info',0));
lsn | tli | flags | lower | upper | special | pagesize | version | prune_xid
-----------+-----+-------+-------+-------+---------+----------+---------+-----------
0/E85E330 | 1 | 0 | 568 | 576 | 8192 | 8192 | 4 | 0
(1 row)
0号page的lower和upper值之间剩余只有576-568=8字节 。一会我们看一下一条items+tuples的长度，已经超过8字节，因此0号PAGE不适合插入新行了。
tli 表示时间线，这个一般用于RESETXLOG后或触发PROMOTE之后WAL时间线的分辨。用pg_controldata可以看到LIN的信息。
如下：
postgres@db5-> pg_controldata
pg_control version number: 903
Catalog version number: 201104251
Database system identifier: 5607124598447901567
Database cluster state: in production
pg_control last modified: Fri 27 May 2011 05:23:36 PM CST
Latest checkpoint location: 0/E933940
Prior checkpoint location: 0/E83EF68
Latest checkpoint's REDO location: 0/E933940
Latest checkpoint's TimeLineID: 1
其他不再多做解释，还是参照源代码。
查看ITEMS的信息：
digoal=# select * from heap_page_items(get_raw_page('tbl_user_info',0));
lp表示line point
lp_off是tuple在page中的相对位置
t_xmin,t_xmax都与实务有关
t_ctid就是表示这个LINE POINT指向的位置。
其他参考源代码.
lp | lp_off | lp_flags | lp_len | t_xmin | t_xmax | t_field3 | t_ctid | t_infomask2 | t_infomask | t_hoff | t_bits | t_oid
-----+--------+----------+--------+--------+--------+----------+---------+-------------+------------+--------+--------+-------
1 | 8136 | 1 | 49 | 1877 | 0 | 0 | (0,1) | 4 | 2306 | 24 | |
2 | 8080 | 1 | 49 | 1877 | 0 | 0 | (0,2) | 4 | 2306 | 24 | |
3 | 8024 | 1 | 49 | 1877 | 0 | 0 | (0,3) | 4 | 2306 | 24 | |
4 | 7968 | 1 | 49 | 1877 | 0 | 0 | (0,4) | 4 | 2306 | 24 | |
5 | 7912 | 1 | 49 | 1877 | 0 | 0 | (0,5) | 4 | 2306 | 24 | |
6 | 7856 | 1 | 49 | 1877 | 0 | 0 | (0,6) | 4 | 2306 | 24 | |
7 | 7800 | 1 | 49 | 1877 | 0 | 0 | (0,7) | 4 | 2306 | 24 | |
8 | 7744 | 1 | 49 | 1877 | 0 | 0 | (0,8) | 4 | 2306 | 24 | |
9 | 7688 | 1 | 49 | 1877 | 0 | 0 | (0,9) | 4 | 2306 | 24 | |
10 | 7632 | 1 | 49 | 1877 | 0 | 0 | (0,10) | 4 | 2306 | 24 | |
11 | 7576 | 1 | 49 | 1877 | 0 | 0 | (0,11) | 4 | 2306 | 24 | |
12 | 7520 | 1 | 49 | 1877 | 0 | 0 | (0,12) | 4 | 2306 | 24 | |
13 | 7464 | 1 | 49 | 1877 | 0 | 0 | (0,13) | 4 | 2306 | 24 | |
14 | 7408 | 1 | 49 | 1877 | 0 | 0 | (0,14) | 4 | 2306 | 24 | |
15 | 7352 | 1 | 49 | 1877 | 0 | 0 | (0,15) | 4 | 2306 | 24 | |
16 | 7296 | 1 | 49 | 1877 | 0 | 0 | (0,16) | 4 | 2306 | 24 | |
17 | 7240 | 1 | 49 | 1877 | 0 | 0 | (0,17) | 4 | 2306 | 24 | |
18 | 7184 | 1 | 49 | 1877 | 0 | 0 | (0,18) | 4 | 2306 | 24 | |
19 | 7128 | 1 | 49 | 1877 | 0 | 0 | (0,19) | 4 | 2306 | 24 | |
20 | 7072 | 1 | 49 | 1877 | 0 | 0 | (0,20) | 4 | 2306 | 24 | |
21 | 7016 | 1 | 49 | 1877 | 0 | 0 | (0,21) | 4 | 2306 | 24 | |
22 | 6960 | 1 | 49 | 1877 | 0 | 0 | (0,22) | 4 | 2306 | 24 | |
23 | 6904 | 1 | 49 | 1877 | 0 | 0 | (0,23) | 4 | 2306 | 24 | |
24 | 6848 | 1 | 49 | 1877 | 0 | 0 | (0,24) | 4 | 2306 | 24 | |
25 | 6792 | 1 | 49 | 1877 | 0 | 0 | (0,25) | 4 | 2306 | 24 | |
26 | 6736 | 1 | 49 | 1877 | 0 | 0 | (0,26) | 4 | 2306 | 24 | |
27 | 6680 | 1 | 49 | 1877 | 0 | 0 | (0,27) | 4 | 2306 | 24 | |
28 | 6624 | 1 | 49 | 1877 | 0 | 0 | (0,28) | 4 | 2306 | 24 | |
29 | 6568 | 1 | 49 | 1877 | 0 | 0 | (0,29) | 4 | 2306 | 24 | |
30 | 6512 | 1 | 49 | 1877 | 0 | 0 | (0,30) | 4 | 2306 | 24 | |
31 | 6456 | 1 | 49 | 1877 | 0 | 0 | (0,31) | 4 | 2306 | 24 | |
32 | 6400 | 1 | 49 | 1877 | 0 | 0 | (0,32) | 4 | 2306 | 24 | |
33 | 6344 | 1 | 49 | 1877 | 0 | 0 | (0,33) | 4 | 2306 | 24 | |
34 | 6288 | 1 | 49 | 1877 | 0 | 0 | (0,34) | 4 | 2306 | 24 | |
35 | 6232 | 1 | 49 | 1877 | 0 | 0 | (0,35) | 4 | 2306 | 24 | |
36 | 6176 | 1 | 49 | 1877 | 0 | 0 | (0,36) | 4 | 2306 | 24 | |
37 | 6120 | 1 | 49 | 1877 | 0 | 0 | (0,37) | 4 | 2306 | 24 | |
38 | 6064 | 1 | 49 | 1877 | 0 | 0 | (0,38) | 4 | 2306 | 24 | |
39 | 6008 | 1 | 49 | 1877 | 0 | 0 | (0,39) | 4 | 2306 | 24 | |
40 | 5952 | 1 | 49 | 1877 | 0 | 0 | (0,40) | 4 | 2306 | 24 | |
41 | 5896 | 1 | 49 | 1877 | 0 | 0 | (0,41) | 4 | 2306 | 24 | |
42 | 5840 | 1 | 49 | 1877 | 0 | 0 | (0,42) | 4 | 2306 | 24 | |
43 | 5784 | 1 | 49 | 1877 | 0 | 0 | (0,43) | 4 | 2306 | 24 | |
44 | 5728 | 1 | 49 | 1877 | 0 | 0 | (0,44) | 4 | 2306 | 24 | |
45 | 5672 | 1 | 49 | 1877 | 0 | 0 | (0,45) | 4 | 2306 | 24 | |
46 | 5616 | 1 | 49 | 1877 | 0 | 0 | (0,46) | 4 | 2306 | 24 | |
47 | 5560 | 1 | 49 | 1877 | 0 | 0 | (0,47) | 4 | 2306 | 24 | |
48 | 5504 | 1 | 49 | 1877 | 0 | 0 | (0,48) | 4 | 2306 | 24 | |
49 | 5448 | 1 | 49 | 1877 | 0 | 0 | (0,49) | 4 | 2306 | 24 | |
50 | 5392 | 1 | 49 | 1877 | 0 | 0 | (0,50) | 4 | 2306 | 24 | |
51 | 5336 | 1 | 49 | 1877 | 0 | 0 | (0,51) | 4 | 2306 | 24 | |
52 | 5280 | 1 | 49 | 1877 | 0 | 0 | (0,52) | 4 | 2306 | 24 | |
53 | 5224 | 1 | 49 | 1877 | 0 | 0 | (0,53) | 4 | 2306 | 24 | |
54 | 5168 | 1 | 49 | 1877 | 0 | 0 | (0,54) | 4 | 2306 | 24 | |
55 | 5112 | 1 | 49 | 1877 | 0 | 0 | (0,55) | 4 | 2306 | 24 | |
56 | 5056 | 1 | 49 | 1877 | 0 | 0 | (0,56) | 4 | 2306 | 24 | |
57 | 5000 | 1 | 49 | 1877 | 0 | 0 | (0,57) | 4 | 2306 | 24 | |
58 | 4944 | 1 | 49 | 1877 | 0 | 0 | (0,58) | 4 | 2306 | 24 | |
59 | 4888 | 1 | 49 | 1877 | 0 | 0 | (0,59) | 4 | 2306 | 24 | |
60 | 4832 | 1 | 49 | 1877 | 0 | 0 | (0,60) | 4 | 2306 | 24 | |
61 | 4776 | 1 | 49 | 1877 | 0 | 0 | (0,61) | 4 | 2306 | 24 | |
62 | 4720 | 1 | 49 | 1877 | 0 | 0 | (0,62) | 4 | 2306 | 24 | |
63 | 4664 | 1 | 49 | 1877 | 0 | 0 | (0,63) | 4 | 2306 | 24 | |
64 | 4608 | 1 | 49 | 1877 | 0 | 0 | (0,64) | 4 | 2306 | 24 | |
65 | 4552 | 1 | 49 | 1877 | 0 | 0 | (0,65) | 4 | 2306 | 24 | |
66 | 4496 | 1 | 49 | 1877 | 0 | 0 | (0,66) | 4 | 2306 | 24 | |
67 | 4440 | 1 | 49 | 1877 | 0 | 0 | (0,67) | 4 | 2306 | 24 | |
68 | 4384 | 1 | 49 | 1877 | 0 | 0 | (0,68) | 4 | 2306 | 24 | |
69 | 4328 | 1 | 49 | 1877 | 0 | 0 | (0,69) | 4 | 2306 | 24 | |
70 | 4272 | 1 | 49 | 1877 | 0 | 0 | (0,70) | 4 | 2306 | 24 | |
71 | 4216 | 1 | 49 | 1877 | 0 | 0 | (0,71) | 4 | 2306 | 24 | |
72 | 4160 | 1 | 49 | 1877 | 0 | 0 | (0,72) | 4 | 2306 | 24 | |
73 | 4104 | 1 | 49 | 1877 | 0 | 0 | (0,73) | 4 | 2306 | 24 | |
74 | 4048 | 1 | 49 | 1877 | 0 | 0 | (0,74) | 4 | 2306 | 24 | |
75 | 3992 | 1 | 49 | 1877 | 0 | 0 | (0,75) | 4 | 2306 | 24 | |
76 | 3936 | 1 | 49 | 1877 | 0 | 0 | (0,76) | 4 | 2306 | 24 | |
77 | 3880 | 1 | 49 | 1877 | 0 | 0 | (0,77) | 4 | 2306 | 24 | |
78 | 3824 | 1 | 49 | 1877 | 0 | 0 | (0,78) | 4 | 2306 | 24 | |
79 | 3768 | 1 | 49 | 1877 | 0 | 0 | (0,79) | 4 | 2306 | 24 | |
80 | 3712 | 1 | 49 | 1877 | 0 | 0 | (0,80) | 4 | 2306 | 24 | |
81 | 3656 | 1 | 49 | 1877 | 0 | 0 | (0,81) | 4 | 2306 | 24 | |
82 | 3600 | 1 | 49 | 1877 | 0 | 0 | (0,82) | 4 | 2306 | 24 | |
83 | 3544 | 1 | 49 | 1877 | 0 | 0 | (0,83) | 4 | 2306 | 24 | |
84 | 3488 | 1 | 49 | 1877 | 0 | 0 | (0,84) | 4 | 2306 | 24 | |
85 | 3432 | 1 | 49 | 1877 | 0 | 0 | (0,85) | 4 | 2306 | 24 | |
86 | 3376 | 1 | 49 | 1877 | 0 | 0 | (0,86) | 4 | 2306 | 24 | |
87 | 3320 | 1 | 49 | 1877 | 0 | 0 | (0,87) | 4 | 2306 | 24 | |
88 | 3264 | 1 | 49 | 1877 | 0 | 0 | (0,88) | 4 | 2306 | 24 | |
89 | 3208 | 1 | 49 | 1877 | 0 | 0 | (0,89) | 4 | 2306 | 24 | |
90 | 3152 | 1 | 49 | 1877 | 0 | 0 | (0,90) | 4 | 2306 | 24 | |
91 | 3096 | 1 | 49 | 1877 | 0 | 0 | (0,91) | 4 | 2306 | 24 | |
92 | 3040 | 1 | 49 | 1877 | 0 | 0 | (0,92) | 4 | 2306 | 24 | |
93 | 2984 | 1 | 49 | 1877 | 0 | 0 | (0,93) | 4 | 2306 | 24 | |
94 | 2928 | 1 | 49 | 1877 | 0 | 0 | (0,94) | 4 | 2306 | 24 | |
95 | 2872 | 1 | 49 | 1877 | 0 | 0 | (0,95) | 4 | 2306 | 24 | |
96 | 2816 | 1 | 49 | 1877 | 0 | 0 | (0,96) | 4 | 2306 | 24 | |
97 | 2760 | 1 | 49 | 1877 | 0 | 0 | (0,97) | 4 | 2306 | 24 | |
98 | 2704 | 1 | 49 | 1877 | 0 | 0 | (0,98) | 4 | 2306 | 24 | |
99 | 2648 | 1 | 49 | 1877 | 0 | 0 | (0,99) | 4 | 2306 | 24 | |
100 | 2592 | 1 | 49 | 1877 | 0 | 0 | (0,100) | 4 | 2306 | 24 | |
101 | 2536 | 1 | 49 | 1877 | 0 | 0 | (0,101) | 4 | 2306 | 24 | |
102 | 2480 | 1 | 49 | 1877 | 0 | 0 | (0,102) | 4 | 2306 | 24 | |
103 | 2424 | 1 | 49 | 1877 | 0 | 0 | (0,103) | 4 | 2306 | 24 | |
104 | 2368 | 1 | 49 | 1877 | 0 | 0 | (0,104) | 4 | 2306 | 24 | |
105 | 2312 | 1 | 49 | 1877 | 0 | 0 | (0,105) | 4 | 2306 | 24 | |
106 | 2256 | 1 | 49 | 1877 | 0 | 0 | (0,106) | 4 | 2306 | 24 | |
107 | 2200 | 1 | 49 | 1877 | 0 | 0 | (0,107) | 4 | 2306 | 24 | |
108 | 2144 | 1 | 49 | 1877 | 0 | 0 | (0,108) | 4 | 2306 | 24 | |
109 | 2088 | 1 | 49 | 1877 | 0 | 0 | (0,109) | 4 | 2306 | 24 | |
110 | 2032 | 1 | 49 | 1877 | 0 | 0 | (0,110) | 4 | 2306 | 24 | |
111 | 1976 | 1 | 49 | 1877 | 0 | 0 | (0,111) | 4 | 2306 | 24 | |
112 | 1920 | 1 | 49 | 1877 | 0 | 0 | (0,112) | 4 | 2306 | 24 | |
113 | 1864 | 1 | 49 | 1877 | 0 | 0 | (0,113) | 4 | 2306 | 24 | |
114 | 1808 | 1 | 49 | 1877 | 0 | 0 | (0,114) | 4 | 2306 | 24 | |
115 | 1752 | 1 | 49 | 1877 | 0 | 0 | (0,115) | 4 | 2306 | 24 | |
116 | 1696 | 1 | 49 | 1877 | 0 | 0 | (0,116) | 4 | 2306 | 24 | |
117 | 1640 | 1 | 49 | 1877 | 0 | 0 | (0,117) | 4 | 2306 | 24 | |
118 | 1584 | 1 | 49 | 1877 | 0 | 0 | (0,118) | 4 | 2306 | 24 | |
119 | 1528 | 1 | 49 | 1877 | 0 | 0 | (0,119) | 4 | 2306 | 24 | |
120 | 1472 | 1 | 49 | 1877 | 0 | 0 | (0,120) | 4 | 2306 | 24 | |
121 | 1416 | 1 | 49 | 1877 | 0 | 0 | (0,121) | 4 | 2306 | 24 | |
122 | 1360 | 1 | 49 | 1877 | 0 | 0 | (0,122) | 4 | 2306 | 24 | |
123 | 1304 | 1 | 49 | 1877 | 0 | 0 | (0,123) | 4 | 2306 | 24 | |
124 | 1248 | 1 | 49 | 1877 | 0 | 0 | (0,124) | 4 | 2306 | 24 | |
125 | 1192 | 1 | 49 | 1877 | 0 | 0 | (0,125) | 4 | 2306 | 24 | |
126 | 1136 | 1 | 49 | 1877 | 0 | 0 | (0,126) | 4 | 2306 | 24 | |
127 | 1080 | 1 | 49 | 1877 | 0 | 0 | (0,127) | 4 | 2306 | 24 | |
128 | 1024 | 1 | 49 | 1877 | 0 | 0 | (0,128) | 4 | 2306 | 24 | |
129 | 968 | 1 | 49 | 1877 | 0 | 0 | (0,129) | 4 | 2306 | 24 | |
130 | 912 | 1 | 49 | 1877 | 0 | 0 | (0,130) | 4 | 2306 | 24 | |
131 | 856 | 1 | 49 | 1877 | 0 | 0 | (0,131) | 4 | 2306 | 24 | |
132 | 800 | 1 | 49 | 1877 | 0 | 0 | (0,132) | 4 | 2306 | 24 | |
133 | 744 | 1 | 49 | 1877 | 0 | 0 | (0,133) | 4 | 2306 | 24 | |
134 | 688 | 1 | 49 | 1877 | 0 | 0 | (0,134) | 4 | 2306 | 24 | |
135 | 632 | 1 | 49 | 1877 | 0 | 0 | (0,135) | 4 | 2306 | 24 | |
136 | 576 | 1 | 49 | 1877 | 0 | 0 | (0,136) | 4 | 2306 | 24 | |
(136 rows)
删除一条记录后查看，说明pageinspect不管当前PAGE里的ITEM是否可见，都DUMP出来。
digoal=# delete from tbl_user_info where id=2;
DELETE 1
digoal=# select * from heap_page_items(get_raw_page('tbl_user_info',0));
lp | lp_off | lp_flags | lp_len | t_xmin | t_xmax | t_field3 | t_ctid | t_infomask2 | t_infomask | t_hoff | t_bits | t_oid
-----+--------+----------+--------+--------+--------+----------+---------+-------------+------------+--------+--------+-------
1 | 8136 | 1 | 49 | 1877 | 0 | 0 | (0,1) | 4 | 2306 | 24 | |
2 | 8080 | 1 | 49 | 1877 | 1879 | 0 | (0,2) | 4 | 258 | 24 | |
索引PAGE也是可以被pg_inspect翻译的，如
digoal=# create index id_user_info on tbl_user_info(id);
CREATE INDEX
digoal=# select * from bt_metap('id_user_info');
magic | version | root | level | fastroot | fastlevel
--------+---------+------+-------+----------+-----------
340322 | 2 | 3 | 1 | 3 | 1
(1 row)
digoal=# select * from bt_page_stats('id_user_info',0);
ERROR: block 0 is a meta page
digoal=# select * from bt_page_stats('id_user_info',1);
blkno | type | live_items | dead_items | avg_item_size | page_size | free_size | btpo_prev | btpo_next | btpo | btpo_flags
-------+------+------------+------------+---------------+-----------+-----------+-----------+-----------+------+------------
1 | l | 367 | 0 | 16 | 8192 | 808 | 0 | 2 | 0 | 1
(1 row)
另外一个函数可以读取到底层的数据，如
191 | (1,55) | 16 | f | f | bf 00 00 00 00 00 00 00
192 | (1,56) | 16 | f | f | c0 00 00 00 00 00 00 00
193 | (1,57) | 16 | f | f | c1 00 00 00 00 00 00 00
194 | (1,58) | 16 | f | f | c2 00 00 00 00 00 00 00
195 | (1,59) | 16 | f | f | c3 00 00 00 00 00 00 00
196 | (1,60) | 16 | f | f | c4 00 00 00 00 00 00 00
197 | (1,61) | 16 | f | f | c5 00 00 00 00 00 00 00
198 | (1,62) | 16 | f | f | c6 00 00 00 00 00 00 00
199 | (1,63) | 16 | f | f | c7 00 00 00 00 00 00 00
200 | (1,64) | 16 | f | f | c8 00 00 00 00 00 00 00
201 | (1,65) | 16 | f | f | c9 00 00 00 00 00 00 00
202 | (1,66) | 16 | f | f | ca 00 00 00 00 00 00 00
203 | (1,67) | 16 | f | f | cb 00 00 00 00 00 00 00
204 | (1,68) | 16 | f | f | cc 00 00 00 00 00 00 00
205 | (1,69) | 16 | f | f | cd 00 00 00 00 00 00 00
206 | (1,70) | 16 | f | f | ce 00 00 00 00 00 00 00
207 | (1,71) | 16 | f | f | cf 00 00 00 00 00 00 00
208 | (1,72) | 16 | f | f | d0 00 00 00 00 00 00 00
209 | (1,73) | 16 | f | f | d1 00 00 00 00 00 00 00
210 | (1,74) | 16 | f | f | d2 00 00 00 00 00 00 00
211 | (1,75) | 16 | f | f | d3 00 00 00 00 00 00 00
212 | (1,76) | 16 | f | f | d4 00 00 00 00 00 00 00
213 | (1,77) | 16 | f | f | d5 00 00 00 00 00 00 00
214 | (1,78) | 16 | f | f | d6 00 00 00 00 00 00 00
215 | (1,79) | 16 | f | f | d7 00 00 00 00 00 00 00
216 | (1,80) | 16 | f | f | d8 00 00 00 00 00 00 00
217 | (1,81) | 16 | f | f | d9 00 00 00 00 00 00 00
218 | (1,82) | 16 | f | f | da 00 00 00 00 00 00 00
219 | (1,83) | 16 | f | f | db 00 00 00 00 00 00 00
220 | (1,84) | 16 | f | f | dc 00 00 00 00 00 00 00
221 | (1,85) | 16 | f | f | dd 00 00 00 00 00 00 00
222 | (1,86) | 16 | f | f | de 00 00 00 00 00 00 00
223 | (1,87) | 16 | f | f | df 00 00 00 00 00 00 00
224 | (1,88) | 16 | f | f | e0 00 00 00 00 00 00 00
225 | (1,89) | 16 | f | f | e1 00 00 00 00 00 00 00
226 | (1,90) | 16 | f | f | e2 00 00 00 00 00 00 00
227 | (1,91) | 16 | f | f | e3 00 00 00 00 00 00 00
228 | (1,92) | 16 | f | f | e4 00 00 00 00 00 00 00
229 | (1,93) | 16 | f | f | e5 00 00 00 00 00 00 00
230 | (1,94) | 16 | f | f | e6 00 00 00 00 00 00 00
231 | (1,95) | 16 | f | f | e7 00 00 00 00 00 00 00
232 | (1,96) | 16 | f | f | e8 00 00 00 00 00 00 00
233 | (1,97) | 16 | f | f | e9 00 00 00 00 00 00 00
234 | (1,98) | 16 | f | f | ea 00 00 00 00 00 00 00
235 | (1,99) | 16 | f | f | eb 00 00 00 00 00 00 00
236 | (1,100) | 16 | f | f | ec 00 00 00 00 00 00 00
237 | (1,101) | 16 | f | f | ed 00 00 00 00 00 00 00
238 | (1,102) | 16 | f | f | ee 00 00 00 00 00 00 00
239 | (1,103) | 16 | f | f | ef 00 00 00 00 00 00 00
240 | (1,104) | 16 | f | f | f0 00 00 00 00 00 00 00
241 | (1,105) | 16 | f | f | f1 00 00 00 00 00 00 00
242 | (1,106) | 16 | f | f | f2 00 00 00 00 00 00 00
243 | (1,107) | 16 | f | f | f3 00 00 00 00 00 00 00
244 | (1,108) | 16 | f | f | f4 00 00 00 00 00 00 00
245 | (1,109) | 16 | f | f | f5 00 00 00 00 00 00 00
246 | (1,110) | 16 | f | f | f6 00 00 00 00 00 00 00
247 | (1,111) | 16 | f | f | f7 00 00 00 00 00 00 00
248 | (1,112) | 16 | f | f | f8 00 00 00 00 00 00 00
249 | (1,113) | 16 | f | f | f9 00 00 00 00 00 00 00
250 | (1,114) | 16 | f | f | fa 00 00 00 00 00 00 00
251 | (1,115) | 16 | f | f | fb 00 00 00 00 00 00 00
252 | (1,116) | 16 | f | f | fc 00 00 00 00 00 00 00
253 | (1,117) | 16 | f | f | fd 00 00 00 00 00 00 00
254 | (1,118) | 16 | f | f | fe 00 00 00 00 00 00 00
255 | (1,119) | 16 | f | f | ff 00 00 00 00 00 00 00
256 | (1,120) | 16 | f | f | 00 01 00 00 00 00 00 00
257 | (1,121) | 16 | f | f | 01 01 00 00 00 00 00 00
258 | (1,122) | 16 | f | f | 02 01 00 00 00 00 00 00
259 | (1,123) | 16 | f | f | 03 01 00 00 00 00 00 00
260 | (1,124) | 16 | f | f | 04 01 00 00 00 00 00 00
261 | (1,125) | 16 | f | f | 05 01 00 00 00 00 00 00
262 | (1,126) | 16 | f | f | 06 01 00 00 00 00 00 00
263 | (1,127) | 16 | f | f | 07 01 00 00 00 00 00 00
264 | (1,128) | 16 | f | f | 08 01 00 00 00 00 00 00
265 | (1,129) | 16 | f | f | 09 01 00 00 00 00 00 00
266 | (1,130) | 16 | f | f | 0a 01 00 00 00 00 00 00
267 | (1,131) | 16 | f | f | 0b 01 00 00 00 00 00 00
268 | (1,132) | 16 | f | f | 0c 01 00 00 00 00 00 00
269 | (1,133) | 16 | f | f | 0d 01 00 00 00 00 00 00
270 | (1,134) | 16 | f | f | 0e 01 00 00 00 00 00 00
271 | (1,135) | 16 | f | f | 0f 01 00 00 00 00 00 00
272 | (1,136) | 16 | f | f | 10 01 00 00 00 00 00 00
另外还有一个函数fsm_page_contents(page bytea) 用于查看free space map的信息。