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149 lines
3.5 KiB
Text
149 lines
3.5 KiB
Text
CREATE TABLE test_ps_fetch
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(a INT, b INT, c INT, d INT, PRIMARY KEY (a, b), INDEX idx (c, d))
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ENGINE=INNODB STATS_PERSISTENT=1;
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ANALYZE TABLE test_ps_fetch;
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Table test.test_ps_fetch
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Op analyze
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Msg_type status
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Msg_text Engine-independent statistics collected
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Table test.test_ps_fetch
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Op analyze
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Msg_type status
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Msg_text OK
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SELECT n_rows, clustered_index_size, sum_of_other_index_sizes
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FROM mysql.innodb_table_stats WHERE table_name = 'test_ps_fetch';
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n_rows 0
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clustered_index_size 1
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sum_of_other_index_sizes 1
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SELECT index_name, stat_name, stat_value, sample_size, stat_description
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FROM mysql.innodb_index_stats WHERE table_name = 'test_ps_fetch'
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ORDER BY index_name, stat_name;
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index_name PRIMARY
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stat_name n_diff_pfx01
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stat_value 0
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sample_size 1
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stat_description a
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index_name PRIMARY
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stat_name n_diff_pfx02
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stat_value 0
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sample_size 1
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stat_description a,b
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index_name PRIMARY
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stat_name n_leaf_pages
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stat_value 1
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sample_size NULL
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stat_description Number of leaf pages in the index
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index_name PRIMARY
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stat_name size
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stat_value 1
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sample_size NULL
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stat_description Number of pages in the index
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index_name idx
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stat_name n_diff_pfx01
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stat_value 0
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sample_size 1
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stat_description c
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index_name idx
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stat_name n_diff_pfx02
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stat_value 0
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sample_size 1
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stat_description c,d
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index_name idx
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stat_name n_diff_pfx03
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stat_value 0
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sample_size 1
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stat_description c,d,a
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index_name idx
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stat_name n_diff_pfx04
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stat_value 0
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sample_size 1
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stat_description c,d,a,b
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index_name idx
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stat_name n_leaf_pages
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stat_value 1
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sample_size NULL
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stat_description Number of leaf pages in the index
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index_name idx
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stat_name size
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stat_value 1
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sample_size NULL
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stat_description Number of pages in the index
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SELECT index_name, seq_in_index, column_name, cardinality
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FROM information_schema.statistics WHERE table_name = 'test_ps_fetch'
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ORDER BY index_name, seq_in_index;
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index_name idx
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seq_in_index 1
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column_name c
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cardinality 0
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index_name idx
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seq_in_index 2
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column_name d
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cardinality 0
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index_name PRIMARY
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seq_in_index 1
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column_name a
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cardinality 0
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index_name PRIMARY
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seq_in_index 2
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column_name b
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cardinality 0
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SELECT
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table_rows, avg_row_length, max_data_length, index_length
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FROM information_schema.tables WHERE table_name = 'test_ps_fetch';
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table_rows 0
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avg_row_length 0
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max_data_length 0
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index_length 16384
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UPDATE mysql.innodb_table_stats SET
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n_rows = 1000,
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clustered_index_size = 5
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WHERE
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table_name = 'test_ps_fetch';
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UPDATE mysql.innodb_index_stats SET
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stat_value = 20
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WHERE
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table_name = 'test_ps_fetch' AND
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index_name = 'PRIMARY' AND
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stat_name = 'n_diff_pfx01';
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UPDATE mysql.innodb_index_stats SET
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stat_value = 90
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WHERE
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table_name = 'test_ps_fetch' AND
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index_name = 'PRIMARY' AND
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stat_name = 'n_diff_pfx02';
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UPDATE mysql.innodb_index_stats SET
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stat_value = 3
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WHERE
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table_name = 'test_ps_fetch' AND
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index_name = 'idx' AND
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stat_name = 'n_diff_pfx01';
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UPDATE mysql.innodb_index_stats SET
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stat_value = 11
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WHERE
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table_name = 'test_ps_fetch' AND
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index_name = 'idx' AND
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stat_name = 'n_diff_pfx02';
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FLUSH TABLE test_ps_fetch;
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SELECT seq_in_index, column_name, cardinality
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FROM information_schema.statistics WHERE table_name = 'test_ps_fetch'
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ORDER BY index_name, seq_in_index;
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seq_in_index 1
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column_name c
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cardinality 6
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seq_in_index 2
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column_name d
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cardinality 22
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seq_in_index 1
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column_name a
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cardinality 40
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seq_in_index 2
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column_name b
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cardinality 200
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SELECT
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table_rows, avg_row_length, max_data_length, index_length
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FROM information_schema.tables WHERE table_name = 'test_ps_fetch';
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table_rows 1000
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avg_row_length 81
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max_data_length 0
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index_length 16384
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DROP TABLE test_ps_fetch;
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