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CREATE TABLE arddl (a INT, b INT, PRIMARY KEY (a)) ENGINE=INNODB;
INSERT INTO arddl VALUES (1, 10);
INSERT INTO arddl VALUES (2, 10);
ALTER TABLE arddl ADD INDEX (b);
SELECT n_rows FROM mysql.innodb_table_stats WHERE table_name = 'arddl' ORDER BY 1;
n_rows 2
SELECT index_name, stat_name, stat_value FROM mysql.innodb_index_stats WHERE table_name = 'arddl' AND index_name = 'PRIMARY' ORDER BY 1, 2, 3;
index_name PRIMARY
stat_name n_diff_pfx01
stat_value 2
index_name PRIMARY
stat_name n_leaf_pages
stat_value 1
index_name PRIMARY
stat_name size
stat_value 1
DROP TABLE arddl;
CREATE TABLE arddl (a INT, b INT, PRIMARY KEY (a), KEY (b)) ENGINE=INNODB;
INSERT INTO arddl VALUES (3, 10);
INSERT INTO arddl VALUES (4, 10);
ALTER TABLE arddl DROP INDEX b;
SELECT n_rows FROM mysql.innodb_table_stats WHERE table_name = 'arddl' ORDER BY 1;
n_rows 2
SELECT index_name, stat_name, stat_value FROM mysql.innodb_index_stats WHERE table_name = 'arddl' AND index_name = 'PRIMARY' ORDER BY 1, 2, 3;
index_name PRIMARY
stat_name n_diff_pfx01
stat_value 2
index_name PRIMARY
stat_name n_leaf_pages
stat_value 1
index_name PRIMARY
stat_name size
stat_value 1
DROP TABLE arddl;
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