1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
CREATE TABLE test1 (a int8, b int4range);
INSERT INTO test1 VALUES (72057594037927937, '[0,1)');
CREATE INDEX test1_a_idx ON test1 USING btree (a);
\x
SELECT * FROM bt_metap('test1_a_idx');
-[ RECORD 1 ]-------------+-------
magic | 340322
version | 4
root | 1
level | 0
fastroot | 1
fastlevel | 0
last_cleanup_num_delpages | 0
last_cleanup_num_tuples | -1
allequalimage | t
SELECT * FROM bt_page_stats('test1_a_idx', -1);
ERROR: invalid block number -1
SELECT * FROM bt_page_stats('test1_a_idx', 0);
ERROR: block 0 is a meta page
SELECT * FROM bt_page_stats('test1_a_idx', 1);
-[ RECORD 1 ]-+-----
blkno | 1
type | l
live_items | 1
dead_items | 0
avg_item_size | 16
page_size | 8192
free_size | 8128
btpo_prev | 0
btpo_next | 0
btpo_level | 0
btpo_flags | 3
SELECT * FROM bt_page_stats('test1_a_idx', 2);
ERROR: block number 2 is out of range
-- bt_multi_page_stats() function returns a set of records of page statistics.
CREATE TABLE test2 AS (SELECT generate_series(1, 1000)::int8 AS col1);
CREATE INDEX test2_col1_idx ON test2(col1);
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
ERROR: block 0 is a meta page
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
-[ RECORD 1 ]-+-----
blkno | 1
type | l
live_items | 367
dead_items | 0
avg_item_size | 16
page_size | 8192
free_size | 808
btpo_prev | 0
btpo_next | 2
btpo_level | 0
btpo_flags | 1
-[ RECORD 2 ]-+-----
blkno | 2
type | l
live_items | 367
dead_items | 0
avg_item_size | 16
page_size | 8192
free_size | 808
btpo_prev | 1
btpo_next | 4
btpo_level | 0
btpo_flags | 1
-[ RECORD 3 ]-+-----
blkno | 3
type | r
live_items | 3
dead_items | 0
avg_item_size | 13
page_size | 8192
free_size | 8096
btpo_prev | 0
btpo_next | 0
btpo_level | 1
btpo_flags | 2
-[ RECORD 4 ]-+-----
blkno | 4
type | l
live_items | 268
dead_items | 0
avg_item_size | 16
page_size | 8192
free_size | 2788
btpo_prev | 2
btpo_next | 0
btpo_level | 0
btpo_flags | 1
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
(0 rows)
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
-[ RECORD 1 ]-+-----
blkno | 1
type | l
live_items | 367
dead_items | 0
avg_item_size | 16
page_size | 8192
free_size | 808
btpo_prev | 0
btpo_next | 2
btpo_level | 0
btpo_flags | 1
-[ RECORD 2 ]-+-----
blkno | 2
type | l
live_items | 367
dead_items | 0
avg_item_size | 16
page_size | 8192
free_size | 808
btpo_prev | 1
btpo_next | 4
btpo_level | 0
btpo_flags | 1
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 3, 2);
-[ RECORD 1 ]-+-----
blkno | 3
type | r
live_items | 3
dead_items | 0
avg_item_size | 13
page_size | 8192
free_size | 8096
btpo_prev | 0
btpo_next | 0
btpo_level | 1
btpo_flags | 2
-[ RECORD 2 ]-+-----
blkno | 4
type | l
live_items | 268
dead_items | 0
avg_item_size | 16
page_size | 8192
free_size | 2788
btpo_prev | 2
btpo_next | 0
btpo_level | 0
btpo_flags | 1
SELECT * FROM bt_multi_page_stats('test2_col1_idx', 7, 2);
ERROR: block number 7 is out of range
DROP TABLE test2;
SELECT * FROM bt_page_items('test1_a_idx', -1);
ERROR: invalid block number -1
SELECT * FROM bt_page_items('test1_a_idx', 0);
ERROR: block 0 is a meta page
SELECT * FROM bt_page_items('test1_a_idx', 1);
-[ RECORD 1 ]-----------------------
itemoffset | 1
ctid | (0,1)
itemlen | 16
nulls | f
vars | f
data | 01 00 00 00 00 00 00 01
dead | f
htid | (0,1)
tids |
SELECT * FROM bt_page_items('test1_a_idx', 2);
ERROR: block number 2 is out of range
SELECT * FROM bt_page_items(get_raw_page('test1_a_idx', -1));
ERROR: invalid block number
SELECT * FROM bt_page_items(get_raw_page('test1_a_idx', 0));
ERROR: block is a meta page
SELECT * FROM bt_page_items(get_raw_page('test1_a_idx', 1));
-[ RECORD 1 ]-----------------------
itemoffset | 1
ctid | (0,1)
itemlen | 16
nulls | f
vars | f
data | 01 00 00 00 00 00 00 01
dead | f
htid | (0,1)
tids |
SELECT * FROM bt_page_items(get_raw_page('test1_a_idx', 2));
ERROR: block number 2 is out of range for relation "test1_a_idx"
-- Failure when using a non-btree index.
CREATE INDEX test1_a_hash ON test1 USING hash(a);
SELECT bt_metap('test1_a_hash');
ERROR: "test1_a_hash" is not a btree index
SELECT bt_page_stats('test1_a_hash', 0);
ERROR: "test1_a_hash" is not a btree index
SELECT bt_page_items('test1_a_hash', 0);
ERROR: "test1_a_hash" is not a btree index
SELECT bt_page_items(get_raw_page('test1_a_hash', 0));
ERROR: block is a meta page
CREATE INDEX test1_b_gist ON test1 USING gist(b);
-- Special area of GiST is the same as btree, this complains about inconsistent
-- leaf data on the page.
SELECT bt_page_items(get_raw_page('test1_b_gist', 0));
ERROR: block is not a valid btree leaf page
-- Several failure modes.
-- Suppress the DETAIL message, to allow the tests to work across various
-- page sizes and architectures.
\set VERBOSITY terse
-- invalid page size
SELECT bt_page_items('aaa'::bytea);
ERROR: invalid page size
-- invalid special area size
CREATE INDEX test1_a_brin ON test1 USING brin(a);
SELECT bt_page_items(get_raw_page('test1', 0));
ERROR: input page is not a valid btree page
SELECT bt_page_items(get_raw_page('test1_a_brin', 0));
ERROR: input page is not a valid btree page
\set VERBOSITY default
-- Tests with all-zero pages.
SHOW block_size \gset
SELECT bt_page_items(decode(repeat('00', :block_size), 'hex'));
-[ RECORD 1 ]-+-
bt_page_items |
DROP TABLE test1;
|
