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151 lines
5.2 KiB
Plaintext
151 lines
5.2 KiB
Plaintext
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CREATE TABLE test_hash (a int, b text);
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INSERT INTO test_hash VALUES (1, 'one');
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CREATE INDEX test_hash_a_idx ON test_hash USING hash (a);
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WARNING: hash indexes are not WAL-logged and their use is discouraged
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\x
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SELECT hash_page_type(get_raw_page('test_hash_a_idx', 0));
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-[ RECORD 1 ]--+---------
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hash_page_type | metapage
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SELECT hash_page_type(get_raw_page('test_hash_a_idx', 1));
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-[ RECORD 1 ]--+-------
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hash_page_type | bucket
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SELECT hash_page_type(get_raw_page('test_hash_a_idx', 2));
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-[ RECORD 1 ]--+-------
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hash_page_type | bucket
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SELECT hash_page_type(get_raw_page('test_hash_a_idx', 3));
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-[ RECORD 1 ]--+-------
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hash_page_type | bucket
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SELECT hash_page_type(get_raw_page('test_hash_a_idx', 4));
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-[ RECORD 1 ]--+-------
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hash_page_type | bucket
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SELECT hash_page_type(get_raw_page('test_hash_a_idx', 5));
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-[ RECORD 1 ]--+-------
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hash_page_type | bitmap
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SELECT hash_page_type(get_raw_page('test_hash_a_idx', 6));
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ERROR: block number 6 is out of range for relation "test_hash_a_idx"
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SELECT * FROM hash_bitmap_info('test_hash_a_idx', 0);
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ERROR: page is not an overflow page
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DETAIL: Expected 00000001, got 00000008.
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SELECT * FROM hash_bitmap_info('test_hash_a_idx', 1);
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ERROR: page is not an overflow page
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DETAIL: Expected 00000001, got 00000002.
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SELECT * FROM hash_bitmap_info('test_hash_a_idx', 2);
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ERROR: page is not an overflow page
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DETAIL: Expected 00000001, got 00000002.
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SELECT * FROM hash_bitmap_info('test_hash_a_idx', 3);
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ERROR: page is not an overflow page
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DETAIL: Expected 00000001, got 00000002.
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SELECT * FROM hash_bitmap_info('test_hash_a_idx', 4);
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ERROR: page is not an overflow page
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DETAIL: Expected 00000001, got 00000002.
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SELECT * FROM hash_bitmap_info('test_hash_a_idx', 5);
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ERROR: page is not an overflow page
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DETAIL: Expected 00000001, got 00000004.
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SELECT * FROM hash_metapage_info(get_raw_page('test_hash_a_idx', 0));
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-[ RECORD 1 ]----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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magic | 105121344
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version | 2
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ntuples | 1
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ffactor | 307
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bsize | 8152
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bmsize | 4096
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bmshift | 15
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maxbucket | 3
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highmask | 7
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lowmask | 3
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ovflpoint | 2
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firstfree | 0
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nmaps | 1
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procid | 450
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spares | {0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
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mapp | {5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
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SELECT * FROM hash_metapage_info(get_raw_page('test_hash_a_idx', 1));
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ERROR: page is not a hash meta page
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SELECT * FROM hash_metapage_info(get_raw_page('test_hash_a_idx', 2));
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ERROR: page is not a hash meta page
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SELECT * FROM hash_metapage_info(get_raw_page('test_hash_a_idx', 3));
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ERROR: page is not a hash meta page
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SELECT * FROM hash_metapage_info(get_raw_page('test_hash_a_idx', 4));
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ERROR: page is not a hash meta page
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SELECT * FROM hash_metapage_info(get_raw_page('test_hash_a_idx', 5));
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ERROR: page is not a hash meta page
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SELECT * FROM hash_page_stats(get_raw_page('test_hash_a_idx', 0));
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ERROR: page is not a hash bucket or overflow page
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SELECT * FROM hash_page_stats(get_raw_page('test_hash_a_idx', 1));
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-[ RECORD 1 ]---+-----------
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live_items | 0
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dead_items | 0
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page_size | 8192
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free_size | 8148
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hasho_prevblkno | 4294967295
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hasho_nextblkno | 4294967295
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hasho_bucket | 0
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hasho_flag | 2
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hasho_page_id | 65408
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SELECT * FROM hash_page_stats(get_raw_page('test_hash_a_idx', 2));
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-[ RECORD 1 ]---+-----------
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live_items | 0
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dead_items | 0
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page_size | 8192
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free_size | 8148
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hasho_prevblkno | 4294967295
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hasho_nextblkno | 4294967295
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hasho_bucket | 1
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hasho_flag | 2
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hasho_page_id | 65408
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SELECT * FROM hash_page_stats(get_raw_page('test_hash_a_idx', 3));
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-[ RECORD 1 ]---+-----------
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live_items | 1
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dead_items | 0
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page_size | 8192
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free_size | 8128
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hasho_prevblkno | 4294967295
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hasho_nextblkno | 4294967295
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hasho_bucket | 2
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hasho_flag | 2
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hasho_page_id | 65408
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SELECT * FROM hash_page_stats(get_raw_page('test_hash_a_idx', 4));
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-[ RECORD 1 ]---+-----------
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live_items | 0
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dead_items | 0
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page_size | 8192
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free_size | 8148
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hasho_prevblkno | 4294967295
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hasho_nextblkno | 4294967295
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hasho_bucket | 3
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hasho_flag | 2
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hasho_page_id | 65408
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SELECT * FROM hash_page_stats(get_raw_page('test_hash_a_idx', 5));
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ERROR: page is not a hash bucket or overflow page
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SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 0));
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ERROR: page is not a hash bucket or overflow page
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SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 1));
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(0 rows)
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SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 2));
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(0 rows)
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SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 3));
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-[ RECORD 1 ]----------
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itemoffset | 1
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ctid | (0,1)
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data | 2389907270
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SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 4));
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(0 rows)
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SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 5));
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ERROR: page is not a hash bucket or overflow page
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DROP TABLE test_hash;
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