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btree_walk.sql
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btree_walk.sql
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--------------table setup--------------------------------------------------------------
create table indexed(a int primary key, b text, c numeric(3,2));
insert into indexed(a,b,c)
select g, md5(g::text), sin(g)
from generate_series(1,1e6) g;
alter index indexed_pkey rename to indexed_a;
--------------root node---------------------------------------------------------------------------------------
--root node meta info.
select root,level from bt_metap('indexed_a');
/*
root | level
------+-------
412 | 2
(1 row)
*/
--root node page stats.
select * from bt_page_stats('indexed_a',412) \gx
/*
-[ RECORD 1 ]-+-----
blkno | 412
type | r
live_items | 10
dead_items | 0
avg_item_size | 15
page_size | 8192
free_size | 7956
btpo_prev | 0
btpo_next | 0
btpo_level | 2
btpo_flags | 2
*/
----------- go to root level. no "high key"
select itemoffset, itemlen, ctid, data
from bt_page_items('indexed_a',412)
order by itemoffset;
/*
itemoffset | itemlen | ctid | data
------------+---------+----------+-------------------------
1 | 8 | (3,0) |
2 | 16 | (411,1) | 77 97 01 00 00 00 00 00
3 | 16 | (698,1) | ed 2e 03 00 00 00 00 00
4 | 16 | (984,1) | 63 c6 04 00 00 00 00 00
5 | 16 | (1270,1) | d9 5d 06 00 00 00 00 00
6 | 16 | (1556,1) | 4f f5 07 00 00 00 00 00
7 | 16 | (1842,1) | c5 8c 09 00 00 00 00 00
8 | 16 | (2128,1) | 3b 24 0b 00 00 00 00 00
9 | 16 | (2414,1) | b1 bb 0c 00 00 00 00 00
10 | 16 | (2700,1) | 27 53 0e 00 00 00 00 00
(10 rows)
*/
select x'019777'::int as root_itemoffset2, x'032eed'::int as root_itemoffset3;
/*
root_itemoffset2 | root_itemoffset3
------------------+------------------
104311 | 208621
(1 row)
*/
--------------inner node-----------------------------------------------------------------------------------------
select * from bt_page_stats('indexed_a',411) \gx
/*
-[ RECORD 1 ]-+-----
blkno | 411
type | i
live_items | 286
dead_items | 0
avg_item_size | 15
page_size | 8192
free_size | 2436
btpo_prev | 3
btpo_next | 698
btpo_level | 1
btpo_flags | 0
*/
select itemoffset, itemlen, ctid, data
from bt_page_items('indexed_a',411)
order by itemoffset
limit 10;
/*
itemoffset | itemlen | ctid | data
------------+---------+---------+-------------------------
1 | 16 | (574,1) | ed 2e 03 00 00 00 00 00
2 | 8 | (287,0) |
3 | 16 | (288,1) | e5 98 01 00 00 00 00 00
4 | 16 | (289,1) | 53 9a 01 00 00 00 00 00
5 | 16 | (290,1) | c1 9b 01 00 00 00 00 00
6 | 16 | (291,1) | 2f 9d 01 00 00 00 00 00
7 | 16 | (292,1) | 9d 9e 01 00 00 00 00 00
8 | 16 | (293,1) | 0b a0 01 00 00 00 00 00
9 | 16 | (294,1) | 79 a1 01 00 00 00 00 00
10 | 16 | (295,1) | e7 a2 01 00 00 00 00 00
(10 rows)
*/
select x'0198e5'::int as low_bound_inc,x'019a53'::int as upper_bound_exc,x'032eed'::int as high_key;
/*
low_bound_inc | upper_bound_exc | high_key
---------------+-----------------+----------
104677 | 105043 | 208621
(1 row)
*/
--------------leaf node---------------------------------------------------------------------------------
select * from bt_page_stats('indexed_a',288) \gx
/*
-[ RECORD 1 ]-+-----
blkno | 288
type | l
live_items | 367
dead_items | 0
avg_item_size | 16
page_size | 8192
free_size | 808
btpo_prev | 287
btpo_next | 289
btpo_level | 0
btpo_flags | 1
*/
select itemoffset, itemlen, ctid, data
from bt_page_items('indexed_a',288)
order by itemoffset;
/*
itemoffset | itemlen | ctid | data
------------+---------+-----------+-------------------------
1 | 16 | (981,1) | 53 9a 01 00 00 00 00 00
2 | 16 | (978,31) | e5 98 01 00 00 00 00 00
3 | 16 | (978,32) | e6 98 01 00 00 00 00 00
4 | 16 | (978,33) | e7 98 01 00 00 00 00 00
5 | 16 | (978,34) | e8 98 01 00 00 00 00 00
6 | 16 | (978,35) | e9 98 01 00 00 00 00 00
7 | 16 | (978,36) | ea 98 01 00 00 00 00 00
8 | 16 | (978,37) | eb 98 01 00 00 00 00 00
9 | 16 | (978,38) | ec 98 01 00 00 00 00 00
10 | 16 | (978,39) | ed 98 01 00 00 00 00 00
11 | 16 | (978,40) | ee 98 01 00 00 00 00 00
12 | 16 | (978,41) | ef 98 01 00 00 00 00 00
13 | 16 | (978,42) | f0 98 01 00 00 00 00 00
14 | 16 | (978,43) | f1 98 01 00 00 00 00 00
15 | 16 | (978,44) | f2 98 01 00 00 00 00 00
16 | 16 | (978,45) | f3 98 01 00 00 00 00 00
17 | 16 | (978,46) | f4 98 01 00 00 00 00 00
18 | 16 | (978,47) | f5 98 01 00 00 00 00 00
19 | 16 | (978,48) | f6 98 01 00 00 00 00 00
20 | 16 | (978,49) | f7 98 01 00 00 00 00 00
21 | 16 | (978,50) | f8 98 01 00 00 00 00 00
22 | 16 | (978,51) | f9 98 01 00 00 00 00 00
23 | 16 | (978,52) | fa 98 01 00 00 00 00 00
24 | 16 | (978,53) | fb 98 01 00 00 00 00 00
25 | 16 | (978,54) | fc 98 01 00 00 00 00 00
26 | 16 | (978,55) | fd 98 01 00 00 00 00 00
27 | 16 | (978,56) | fe 98 01 00 00 00 00 00
28 | 16 | (978,57) | ff 98 01 00 00 00 00 00
29 | 16 | (978,58) | 00 99 01 00 00 00 00 00
30 | 16 | (978,59) | 01 99 01 00 00 00 00 00
31 | 16 | (978,60) | 02 99 01 00 00 00 00 00
32 | 16 | (978,61) | 03 99 01 00 00 00 00 00
33 | 16 | (978,62) | 04 99 01 00 00 00 00 00
34 | 16 | (978,63) | 05 99 01 00 00 00 00 00
35 | 16 | (978,64) | 06 99 01 00 00 00 00 00
36 | 16 | (978,65) | 07 99 01 00 00 00 00 00
37 | 16 | (978,66) | 08 99 01 00 00 00 00 00
38 | 16 | (978,67) | 09 99 01 00 00 00 00 00
39 | 16 | (978,68) | 0a 99 01 00 00 00 00 00
40 | 16 | (978,69) | 0b 99 01 00 00 00 00 00
41 | 16 | (978,70) | 0c 99 01 00 00 00 00 00
42 | 16 | (978,71) | 0d 99 01 00 00 00 00 00
43 | 16 | (978,72) | 0e 99 01 00 00 00 00 00
44 | 16 | (978,73) | 0f 99 01 00 00 00 00 00
45 | 16 | (978,74) | 10 99 01 00 00 00 00 00
46 | 16 | (978,75) | 11 99 01 00 00 00 00 00
47 | 16 | (978,76) | 12 99 01 00 00 00 00 00
48 | 16 | (978,77) | 13 99 01 00 00 00 00 00
49 | 16 | (978,78) | 14 99 01 00 00 00 00 00
50 | 16 | (978,79) | 15 99 01 00 00 00 00 00
51 | 16 | (978,80) | 16 99 01 00 00 00 00 00
52 | 16 | (978,81) | 17 99 01 00 00 00 00 00
53 | 16 | (978,82) | 18 99 01 00 00 00 00 00
54 | 16 | (978,83) | 19 99 01 00 00 00 00 00
55 | 16 | (978,84) | 1a 99 01 00 00 00 00 00
56 | 16 | (978,85) | 1b 99 01 00 00 00 00 00
57 | 16 | (978,86) | 1c 99 01 00 00 00 00 00
58 | 16 | (978,87) | 1d 99 01 00 00 00 00 00
59 | 16 | (978,88) | 1e 99 01 00 00 00 00 00
60 | 16 | (978,89) | 1f 99 01 00 00 00 00 00
61 | 16 | (978,90) | 20 99 01 00 00 00 00 00
62 | 16 | (978,91) | 21 99 01 00 00 00 00 00
63 | 16 | (978,92) | 22 99 01 00 00 00 00 00
64 | 16 | (978,93) | 23 99 01 00 00 00 00 00
65 | 16 | (978,94) | 24 99 01 00 00 00 00 00
66 | 16 | (978,95) | 25 99 01 00 00 00 00 00
67 | 16 | (978,96) | 26 99 01 00 00 00 00 00
68 | 16 | (978,97) | 27 99 01 00 00 00 00 00
69 | 16 | (978,98) | 28 99 01 00 00 00 00 00
70 | 16 | (978,99) | 29 99 01 00 00 00 00 00
71 | 16 | (978,100) | 2a 99 01 00 00 00 00 00
72 | 16 | (978,101) | 2b 99 01 00 00 00 00 00
73 | 16 | (978,102) | 2c 99 01 00 00 00 00 00
74 | 16 | (978,103) | 2d 99 01 00 00 00 00 00
75 | 16 | (978,104) | 2e 99 01 00 00 00 00 00
76 | 16 | (978,105) | 2f 99 01 00 00 00 00 00
77 | 16 | (978,106) | 30 99 01 00 00 00 00 00
78 | 16 | (978,107) | 31 99 01 00 00 00 00 00
79 | 16 | (979,1) | 32 99 01 00 00 00 00 00
80 | 16 | (979,2) | 33 99 01 00 00 00 00 00
81 | 16 | (979,3) | 34 99 01 00 00 00 00 00
82 | 16 | (979,4) | 35 99 01 00 00 00 00 00
83 | 16 | (979,5) | 36 99 01 00 00 00 00 00
84 | 16 | (979,6) | 37 99 01 00 00 00 00 00
85 | 16 | (979,7) | 38 99 01 00 00 00 00 00
86 | 16 | (979,8) | 39 99 01 00 00 00 00 00
87 | 16 | (979,9) | 3a 99 01 00 00 00 00 00
88 | 16 | (979,10) | 3b 99 01 00 00 00 00 00
89 | 16 | (979,11) | 3c 99 01 00 00 00 00 00
90 | 16 | (979,12) | 3d 99 01 00 00 00 00 00
91 | 16 | (979,13) | 3e 99 01 00 00 00 00 00
92 | 16 | (979,14) | 3f 99 01 00 00 00 00 00
93 | 16 | (979,15) | 40 99 01 00 00 00 00 00
94 | 16 | (979,16) | 41 99 01 00 00 00 00 00
95 | 16 | (979,17) | 42 99 01 00 00 00 00 00
96 | 16 | (979,18) | 43 99 01 00 00 00 00 00
97 | 16 | (979,19) | 44 99 01 00 00 00 00 00
98 | 16 | (979,20) | 45 99 01 00 00 00 00 00
99 | 16 | (979,21) | 46 99 01 00 00 00 00 00
100 | 16 | (979,22) | 47 99 01 00 00 00 00 00
101 | 16 | (979,23) | 48 99 01 00 00 00 00 00
102 | 16 | (979,24) | 49 99 01 00 00 00 00 00
103 | 16 | (979,25) | 4a 99 01 00 00 00 00 00
104 | 16 | (979,26) | 4b 99 01 00 00 00 00 00
105 | 16 | (979,27) | 4c 99 01 00 00 00 00 00
106 | 16 | (979,28) | 4d 99 01 00 00 00 00 00
107 | 16 | (979,29) | 4e 99 01 00 00 00 00 00
108 | 16 | (979,30) | 4f 99 01 00 00 00 00 00
109 | 16 | (979,31) | 50 99 01 00 00 00 00 00
110 | 16 | (979,32) | 51 99 01 00 00 00 00 00
111 | 16 | (979,33) | 52 99 01 00 00 00 00 00
112 | 16 | (979,34) | 53 99 01 00 00 00 00 00
113 | 16 | (979,35) | 54 99 01 00 00 00 00 00
114 | 16 | (979,36) | 55 99 01 00 00 00 00 00
115 | 16 | (979,37) | 56 99 01 00 00 00 00 00
116 | 16 | (979,38) | 57 99 01 00 00 00 00 00
117 | 16 | (979,39) | 58 99 01 00 00 00 00 00
118 | 16 | (979,40) | 59 99 01 00 00 00 00 00
119 | 16 | (979,41) | 5a 99 01 00 00 00 00 00
120 | 16 | (979,42) | 5b 99 01 00 00 00 00 00
121 | 16 | (979,43) | 5c 99 01 00 00 00 00 00
122 | 16 | (979,44) | 5d 99 01 00 00 00 00 00
123 | 16 | (979,45) | 5e 99 01 00 00 00 00 00
124 | 16 | (979,46) | 5f 99 01 00 00 00 00 00
125 | 16 | (979,47) | 60 99 01 00 00 00 00 00
126 | 16 | (979,48) | 61 99 01 00 00 00 00 00
127 | 16 | (979,49) | 62 99 01 00 00 00 00 00
128 | 16 | (979,50) | 63 99 01 00 00 00 00 00
129 | 16 | (979,51) | 64 99 01 00 00 00 00 00
130 | 16 | (979,52) | 65 99 01 00 00 00 00 00
131 | 16 | (979,53) | 66 99 01 00 00 00 00 00
132 | 16 | (979,54) | 67 99 01 00 00 00 00 00
133 | 16 | (979,55) | 68 99 01 00 00 00 00 00
134 | 16 | (979,56) | 69 99 01 00 00 00 00 00
135 | 16 | (979,57) | 6a 99 01 00 00 00 00 00
136 | 16 | (979,58) | 6b 99 01 00 00 00 00 00
137 | 16 | (979,59) | 6c 99 01 00 00 00 00 00
138 | 16 | (979,60) | 6d 99 01 00 00 00 00 00
139 | 16 | (979,61) | 6e 99 01 00 00 00 00 00
140 | 16 | (979,62) | 6f 99 01 00 00 00 00 00
141 | 16 | (979,63) | 70 99 01 00 00 00 00 00
142 | 16 | (979,64) | 71 99 01 00 00 00 00 00
143 | 16 | (979,65) | 72 99 01 00 00 00 00 00
144 | 16 | (979,66) | 73 99 01 00 00 00 00 00
145 | 16 | (979,67) | 74 99 01 00 00 00 00 00
146 | 16 | (979,68) | 75 99 01 00 00 00 00 00
147 | 16 | (979,69) | 76 99 01 00 00 00 00 00
148 | 16 | (979,70) | 77 99 01 00 00 00 00 00
149 | 16 | (979,71) | 78 99 01 00 00 00 00 00
150 | 16 | (979,72) | 79 99 01 00 00 00 00 00
151 | 16 | (979,73) | 7a 99 01 00 00 00 00 00
152 | 16 | (979,74) | 7b 99 01 00 00 00 00 00
153 | 16 | (979,75) | 7c 99 01 00 00 00 00 00
154 | 16 | (979,76) | 7d 99 01 00 00 00 00 00
155 | 16 | (979,77) | 7e 99 01 00 00 00 00 00
156 | 16 | (979,78) | 7f 99 01 00 00 00 00 00
157 | 16 | (979,79) | 80 99 01 00 00 00 00 00
158 | 16 | (979,80) | 81 99 01 00 00 00 00 00
159 | 16 | (979,81) | 82 99 01 00 00 00 00 00
160 | 16 | (979,82) | 83 99 01 00 00 00 00 00
161 | 16 | (979,83) | 84 99 01 00 00 00 00 00
162 | 16 | (979,84) | 85 99 01 00 00 00 00 00
163 | 16 | (979,85) | 86 99 01 00 00 00 00 00
164 | 16 | (979,86) | 87 99 01 00 00 00 00 00
165 | 16 | (979,87) | 88 99 01 00 00 00 00 00
166 | 16 | (979,88) | 89 99 01 00 00 00 00 00
167 | 16 | (979,89) | 8a 99 01 00 00 00 00 00
168 | 16 | (979,90) | 8b 99 01 00 00 00 00 00
169 | 16 | (979,91) | 8c 99 01 00 00 00 00 00
170 | 16 | (979,92) | 8d 99 01 00 00 00 00 00
171 | 16 | (979,93) | 8e 99 01 00 00 00 00 00
172 | 16 | (979,94) | 8f 99 01 00 00 00 00 00
173 | 16 | (979,95) | 90 99 01 00 00 00 00 00
174 | 16 | (979,96) | 91 99 01 00 00 00 00 00
175 | 16 | (979,97) | 92 99 01 00 00 00 00 00
176 | 16 | (979,98) | 93 99 01 00 00 00 00 00
177 | 16 | (979,99) | 94 99 01 00 00 00 00 00
178 | 16 | (979,100) | 95 99 01 00 00 00 00 00
179 | 16 | (979,101) | 96 99 01 00 00 00 00 00
180 | 16 | (979,102) | 97 99 01 00 00 00 00 00
181 | 16 | (979,103) | 98 99 01 00 00 00 00 00
182 | 16 | (979,104) | 99 99 01 00 00 00 00 00
183 | 16 | (979,105) | 9a 99 01 00 00 00 00 00
184 | 16 | (979,106) | 9b 99 01 00 00 00 00 00
185 | 16 | (979,107) | 9c 99 01 00 00 00 00 00
186 | 16 | (980,1) | 9d 99 01 00 00 00 00 00
187 | 16 | (980,2) | 9e 99 01 00 00 00 00 00
188 | 16 | (980,3) | 9f 99 01 00 00 00 00 00
189 | 16 | (980,4) | a0 99 01 00 00 00 00 00
190 | 16 | (980,5) | a1 99 01 00 00 00 00 00
191 | 16 | (980,6) | a2 99 01 00 00 00 00 00
192 | 16 | (980,7) | a3 99 01 00 00 00 00 00
193 | 16 | (980,8) | a4 99 01 00 00 00 00 00
194 | 16 | (980,9) | a5 99 01 00 00 00 00 00
195 | 16 | (980,10) | a6 99 01 00 00 00 00 00
196 | 16 | (980,11) | a7 99 01 00 00 00 00 00
197 | 16 | (980,12) | a8 99 01 00 00 00 00 00
198 | 16 | (980,13) | a9 99 01 00 00 00 00 00
199 | 16 | (980,14) | aa 99 01 00 00 00 00 00
200 | 16 | (980,15) | ab 99 01 00 00 00 00 00
201 | 16 | (980,16) | ac 99 01 00 00 00 00 00
202 | 16 | (980,17) | ad 99 01 00 00 00 00 00
203 | 16 | (980,18) | ae 99 01 00 00 00 00 00
204 | 16 | (980,19) | af 99 01 00 00 00 00 00
205 | 16 | (980,20) | b0 99 01 00 00 00 00 00
206 | 16 | (980,21) | b1 99 01 00 00 00 00 00
207 | 16 | (980,22) | b2 99 01 00 00 00 00 00
208 | 16 | (980,23) | b3 99 01 00 00 00 00 00
209 | 16 | (980,24) | b4 99 01 00 00 00 00 00
210 | 16 | (980,25) | b5 99 01 00 00 00 00 00
211 | 16 | (980,26) | b6 99 01 00 00 00 00 00
212 | 16 | (980,27) | b7 99 01 00 00 00 00 00
213 | 16 | (980,28) | b8 99 01 00 00 00 00 00
214 | 16 | (980,29) | b9 99 01 00 00 00 00 00
215 | 16 | (980,30) | ba 99 01 00 00 00 00 00
216 | 16 | (980,31) | bb 99 01 00 00 00 00 00
217 | 16 | (980,32) | bc 99 01 00 00 00 00 00
218 | 16 | (980,33) | bd 99 01 00 00 00 00 00
219 | 16 | (980,34) | be 99 01 00 00 00 00 00
220 | 16 | (980,35) | bf 99 01 00 00 00 00 00
221 | 16 | (980,36) | c0 99 01 00 00 00 00 00
222 | 16 | (980,37) | c1 99 01 00 00 00 00 00
223 | 16 | (980,38) | c2 99 01 00 00 00 00 00
224 | 16 | (980,39) | c3 99 01 00 00 00 00 00
225 | 16 | (980,40) | c4 99 01 00 00 00 00 00
226 | 16 | (980,41) | c5 99 01 00 00 00 00 00
227 | 16 | (980,42) | c6 99 01 00 00 00 00 00
228 | 16 | (980,43) | c7 99 01 00 00 00 00 00
229 | 16 | (980,44) | c8 99 01 00 00 00 00 00
230 | 16 | (980,45) | c9 99 01 00 00 00 00 00
231 | 16 | (980,46) | ca 99 01 00 00 00 00 00
232 | 16 | (980,47) | cb 99 01 00 00 00 00 00
233 | 16 | (980,48) | cc 99 01 00 00 00 00 00
234 | 16 | (980,49) | cd 99 01 00 00 00 00 00
235 | 16 | (980,50) | ce 99 01 00 00 00 00 00
236 | 16 | (980,51) | cf 99 01 00 00 00 00 00
237 | 16 | (980,52) | d0 99 01 00 00 00 00 00
238 | 16 | (980,53) | d1 99 01 00 00 00 00 00
239 | 16 | (980,54) | d2 99 01 00 00 00 00 00
240 | 16 | (980,55) | d3 99 01 00 00 00 00 00
241 | 16 | (980,56) | d4 99 01 00 00 00 00 00
242 | 16 | (980,57) | d5 99 01 00 00 00 00 00
243 | 16 | (980,58) | d6 99 01 00 00 00 00 00
244 | 16 | (980,59) | d7 99 01 00 00 00 00 00
245 | 16 | (980,60) | d8 99 01 00 00 00 00 00
246 | 16 | (980,61) | d9 99 01 00 00 00 00 00
247 | 16 | (980,62) | da 99 01 00 00 00 00 00
248 | 16 | (980,63) | db 99 01 00 00 00 00 00
249 | 16 | (980,64) | dc 99 01 00 00 00 00 00
250 | 16 | (980,65) | dd 99 01 00 00 00 00 00
251 | 16 | (980,66) | de 99 01 00 00 00 00 00
252 | 16 | (980,67) | df 99 01 00 00 00 00 00
253 | 16 | (980,68) | e0 99 01 00 00 00 00 00
254 | 16 | (980,69) | e1 99 01 00 00 00 00 00
255 | 16 | (980,70) | e2 99 01 00 00 00 00 00
256 | 16 | (980,71) | e3 99 01 00 00 00 00 00
257 | 16 | (980,72) | e4 99 01 00 00 00 00 00
258 | 16 | (980,73) | e5 99 01 00 00 00 00 00
259 | 16 | (980,74) | e6 99 01 00 00 00 00 00
260 | 16 | (980,75) | e7 99 01 00 00 00 00 00
261 | 16 | (980,76) | e8 99 01 00 00 00 00 00
262 | 16 | (980,77) | e9 99 01 00 00 00 00 00
263 | 16 | (980,78) | ea 99 01 00 00 00 00 00
264 | 16 | (980,79) | eb 99 01 00 00 00 00 00
265 | 16 | (980,80) | ec 99 01 00 00 00 00 00
266 | 16 | (980,81) | ed 99 01 00 00 00 00 00
267 | 16 | (980,82) | ee 99 01 00 00 00 00 00
268 | 16 | (980,83) | ef 99 01 00 00 00 00 00
269 | 16 | (980,84) | f0 99 01 00 00 00 00 00
270 | 16 | (980,85) | f1 99 01 00 00 00 00 00
271 | 16 | (980,86) | f2 99 01 00 00 00 00 00
272 | 16 | (980,87) | f3 99 01 00 00 00 00 00
273 | 16 | (980,88) | f4 99 01 00 00 00 00 00
274 | 16 | (980,89) | f5 99 01 00 00 00 00 00
275 | 16 | (980,90) | f6 99 01 00 00 00 00 00
276 | 16 | (980,91) | f7 99 01 00 00 00 00 00
277 | 16 | (980,92) | f8 99 01 00 00 00 00 00
278 | 16 | (980,93) | f9 99 01 00 00 00 00 00
279 | 16 | (980,94) | fa 99 01 00 00 00 00 00
280 | 16 | (980,95) | fb 99 01 00 00 00 00 00
281 | 16 | (980,96) | fc 99 01 00 00 00 00 00
282 | 16 | (980,97) | fd 99 01 00 00 00 00 00
283 | 16 | (980,98) | fe 99 01 00 00 00 00 00
284 | 16 | (980,99) | ff 99 01 00 00 00 00 00
285 | 16 | (980,100) | 00 9a 01 00 00 00 00 00
286 | 16 | (980,101) | 01 9a 01 00 00 00 00 00
287 | 16 | (980,102) | 02 9a 01 00 00 00 00 00
288 | 16 | (980,103) | 03 9a 01 00 00 00 00 00
289 | 16 | (980,104) | 04 9a 01 00 00 00 00 00
290 | 16 | (980,105) | 05 9a 01 00 00 00 00 00
291 | 16 | (980,106) | 06 9a 01 00 00 00 00 00
292 | 16 | (980,107) | 07 9a 01 00 00 00 00 00
293 | 16 | (981,1) | 08 9a 01 00 00 00 00 00
294 | 16 | (981,2) | 09 9a 01 00 00 00 00 00
295 | 16 | (981,3) | 0a 9a 01 00 00 00 00 00
296 | 16 | (981,4) | 0b 9a 01 00 00 00 00 00
297 | 16 | (981,5) | 0c 9a 01 00 00 00 00 00
298 | 16 | (981,6) | 0d 9a 01 00 00 00 00 00
299 | 16 | (981,7) | 0e 9a 01 00 00 00 00 00
300 | 16 | (981,8) | 0f 9a 01 00 00 00 00 00
301 | 16 | (981,9) | 10 9a 01 00 00 00 00 00
302 | 16 | (981,10) | 11 9a 01 00 00 00 00 00
303 | 16 | (981,11) | 12 9a 01 00 00 00 00 00
304 | 16 | (981,12) | 13 9a 01 00 00 00 00 00
305 | 16 | (981,13) | 14 9a 01 00 00 00 00 00
306 | 16 | (981,14) | 15 9a 01 00 00 00 00 00
307 | 16 | (981,15) | 16 9a 01 00 00 00 00 00
308 | 16 | (981,16) | 17 9a 01 00 00 00 00 00
309 | 16 | (981,17) | 18 9a 01 00 00 00 00 00
310 | 16 | (981,18) | 19 9a 01 00 00 00 00 00
311 | 16 | (981,19) | 1a 9a 01 00 00 00 00 00
312 | 16 | (981,20) | 1b 9a 01 00 00 00 00 00
313 | 16 | (981,21) | 1c 9a 01 00 00 00 00 00
314 | 16 | (981,22) | 1d 9a 01 00 00 00 00 00
315 | 16 | (981,23) | 1e 9a 01 00 00 00 00 00
316 | 16 | (981,24) | 1f 9a 01 00 00 00 00 00
317 | 16 | (981,25) | 20 9a 01 00 00 00 00 00
318 | 16 | (981,26) | 21 9a 01 00 00 00 00 00
319 | 16 | (981,27) | 22 9a 01 00 00 00 00 00
320 | 16 | (981,28) | 23 9a 01 00 00 00 00 00
321 | 16 | (981,29) | 24 9a 01 00 00 00 00 00
322 | 16 | (981,30) | 25 9a 01 00 00 00 00 00
323 | 16 | (981,31) | 26 9a 01 00 00 00 00 00
324 | 16 | (981,32) | 27 9a 01 00 00 00 00 00
325 | 16 | (981,33) | 28 9a 01 00 00 00 00 00
326 | 16 | (981,34) | 29 9a 01 00 00 00 00 00
327 | 16 | (981,35) | 2a 9a 01 00 00 00 00 00
328 | 16 | (981,36) | 2b 9a 01 00 00 00 00 00
329 | 16 | (981,37) | 2c 9a 01 00 00 00 00 00
330 | 16 | (981,38) | 2d 9a 01 00 00 00 00 00
331 | 16 | (981,39) | 2e 9a 01 00 00 00 00 00
332 | 16 | (981,40) | 2f 9a 01 00 00 00 00 00
333 | 16 | (981,41) | 30 9a 01 00 00 00 00 00
334 | 16 | (981,42) | 31 9a 01 00 00 00 00 00
335 | 16 | (981,43) | 32 9a 01 00 00 00 00 00
336 | 16 | (981,44) | 33 9a 01 00 00 00 00 00
337 | 16 | (981,45) | 34 9a 01 00 00 00 00 00
338 | 16 | (981,46) | 35 9a 01 00 00 00 00 00
339 | 16 | (981,47) | 36 9a 01 00 00 00 00 00
340 | 16 | (981,48) | 37 9a 01 00 00 00 00 00
341 | 16 | (981,49) | 38 9a 01 00 00 00 00 00
342 | 16 | (981,50) | 39 9a 01 00 00 00 00 00
343 | 16 | (981,51) | 3a 9a 01 00 00 00 00 00
344 | 16 | (981,52) | 3b 9a 01 00 00 00 00 00
345 | 16 | (981,53) | 3c 9a 01 00 00 00 00 00
346 | 16 | (981,54) | 3d 9a 01 00 00 00 00 00
347 | 16 | (981,55) | 3e 9a 01 00 00 00 00 00
348 | 16 | (981,56) | 3f 9a 01 00 00 00 00 00
349 | 16 | (981,57) | 40 9a 01 00 00 00 00 00
350 | 16 | (981,58) | 41 9a 01 00 00 00 00 00
351 | 16 | (981,59) | 42 9a 01 00 00 00 00 00
352 | 16 | (981,60) | 43 9a 01 00 00 00 00 00
353 | 16 | (981,61) | 44 9a 01 00 00 00 00 00
354 | 16 | (981,62) | 45 9a 01 00 00 00 00 00
355 | 16 | (981,63) | 46 9a 01 00 00 00 00 00
356 | 16 | (981,64) | 47 9a 01 00 00 00 00 00
357 | 16 | (981,65) | 48 9a 01 00 00 00 00 00
358 | 16 | (981,66) | 49 9a 01 00 00 00 00 00
359 | 16 | (981,67) | 4a 9a 01 00 00 00 00 00
360 | 16 | (981,68) | 4b 9a 01 00 00 00 00 00
361 | 16 | (981,69) | 4c 9a 01 00 00 00 00 00
362 | 16 | (981,70) | 4d 9a 01 00 00 00 00 00
363 | 16 | (981,71) | 4e 9a 01 00 00 00 00 00
364 | 16 | (981,72) | 4f 9a 01 00 00 00 00 00
365 | 16 | (981,73) | 50 9a 01 00 00 00 00 00
366 | 16 | (981,74) | 51 9a 01 00 00 00 00 00
367 | 16 | (981,75) | 52 9a 01 00 00 00 00 00
(367 rows)
*/
select x'019a53'::int as high_key,x'0198e5'::int as low_bound_inc,x'019a52'::int as end_value;
/*
high_key | low_bound_inc | end_value
----------+---------------+-----------
105043 | 104677 | 105042
(1 row)
*/
explain(analyze) select i.a,i.b from indexed i where i.a < 1000;
/*
QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------
Index Scan using indexed_a on indexed i (cost=0.42..42.36 rows=968 width=37) (actual time=0.127..3.417 rows=999 loops=1)
Index Cond: (a < 1000)
Planning Time: 0.687 ms
Execution Time: 3.717 ms
(4 rows)
*/
explain(analyze) select i.a,i.b from indexed i where i.a < 500000;
/*
QUERY PLAN
------------------------------------------------------------------------------------------------------------------------------
--------
Index Scan using indexed_a on indexed i (cost=0.42..18757.47 rows=495774 width=37) (actual time=0.142..617.927 rows=499999 l
oops=1)
Index Cond: (a < 500000)
Planning Time: 0.154 ms
Execution Time: 663.031 ms
(4 rows)
*/
explain(analyze) select i.a,i.b from indexed i where i.a < 700000;
/*
QUERY PLAN
--------------------------------------------------------------------------------------------------------------------
Seq Scan on indexed i (cost=0.00..21846.00 rows=695868 width=37) (actual time=0.037..560.610 rows=699999 loops=1)
Filter: (a < 700000)
Rows Removed by Filter: 300001
Planning Time: 0.156 ms
Execution Time: 623.951 ms
(5 rows)
*/
set enable_seqscan to off;
explain(analyze) select i.a,i.b from indexed i where i.a < 700000;
/*
QUERY PLAN
------------------------------------------------------------------------------------------------------------------------------
--------
Index Scan using indexed_a on indexed i (cost=0.42..26329.12 rows=695868 width=37) (actual time=0.140..854.559 rows=699999 l
oops=1)
Index Cond: (a < 700000)
Planning Time: 0.159 ms
Execution Time: 917.132 ms
(4 rows)
*/
---------------------------clean-up.
reset enable_seqscan to off;
drop table indexed;