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CREATE TABLE t (
a INT,
b INT,
c INT GENERATED ALWAYS AS(a+b),
d INT GENERATED ALWAYS AS(a+b+b),
KEY idxa (a),
KEY vidxcd (c, d)
) ENGINE=INNODB STATS_PERSISTENT=1 STATS_AUTO_RECALC=1;
INSERT INTO t (a,b) VALUES (1, 2);
SELECT index_name, stat_name, stat_description
FROM mysql.innodb_index_stats
WHERE database_name = 'test' AND table_name = 't';
index_name stat_name stat_description
GEN_CLUST_INDEX n_diff_pfx01 DB_ROW_ID
GEN_CLUST_INDEX n_leaf_pages Number of leaf pages in the index
GEN_CLUST_INDEX size Number of pages in the index
idxa n_diff_pfx01 a
idxa n_diff_pfx02 a,DB_ROW_ID
idxa n_leaf_pages Number of leaf pages in the index
idxa size Number of pages in the index
vidxcd n_diff_pfx01 c
vidxcd n_diff_pfx02 c,d
vidxcd n_diff_pfx03 c,d,DB_ROW_ID
vidxcd n_leaf_pages Number of leaf pages in the index
vidxcd size Number of pages in the index
ALTER TABLE t ADD COLUMN e INT GENERATED ALWAYS AS(a+a+b), ADD INDEX idxb (b), ALGORITHM=INPLACE;
select count(*) from t;
count(*)
1
SELECT index_name, stat_name, stat_description
FROM mysql.innodb_index_stats
WHERE database_name = 'test' AND table_name = 't';
index_name stat_name stat_description
GEN_CLUST_INDEX n_diff_pfx01 DB_ROW_ID
GEN_CLUST_INDEX n_leaf_pages Number of leaf pages in the index
GEN_CLUST_INDEX size Number of pages in the index
idxa n_diff_pfx01 a
idxa n_diff_pfx02 a,DB_ROW_ID
idxa n_leaf_pages Number of leaf pages in the index
idxa size Number of pages in the index
vidxcd n_diff_pfx01 c
vidxcd n_diff_pfx02 c,d
vidxcd n_diff_pfx03 c,d,DB_ROW_ID
vidxcd n_leaf_pages Number of leaf pages in the index
vidxcd size Number of pages in the index
ALTER TABLE t DROP COLUMN c, DROP INDEX idxa, ALGORITHM=INPLACE;
select count(*) from t;
count(*)
1
SELECT index_name, stat_name, stat_description
FROM mysql.innodb_index_stats
WHERE database_name = 'test' AND table_name = 't';
index_name stat_name stat_description
GEN_CLUST_INDEX n_diff_pfx01 DB_ROW_ID
GEN_CLUST_INDEX n_leaf_pages Number of leaf pages in the index
GEN_CLUST_INDEX size Number of pages in the index
ALTER TABLE t ADD INDEX vidxe (e), ALGORITHM=INPLACE;
select count(*) from t;
count(*)
1
SELECT index_name, stat_name, stat_description
FROM mysql.innodb_index_stats
WHERE database_name = 'test' AND table_name = 't';
index_name stat_name stat_description
GEN_CLUST_INDEX n_diff_pfx01 DB_ROW_ID
GEN_CLUST_INDEX n_leaf_pages Number of leaf pages in the index
GEN_CLUST_INDEX size Number of pages in the index
ALTER TABLE t ADD COLUMN f INT GENERATED ALWAYS AS(a + a), ADD INDEX vidxf (f), ALGORITHM=INPLACE;
select count(*) from t;
count(*)
1
SELECT index_name, stat_name, stat_description
FROM mysql.innodb_index_stats
WHERE database_name = 'test' AND table_name = 't';
index_name stat_name stat_description
GEN_CLUST_INDEX n_diff_pfx01 DB_ROW_ID
GEN_CLUST_INDEX n_leaf_pages Number of leaf pages in the index
GEN_CLUST_INDEX size Number of pages in the index
ALTER TABLE t DROP INDEX vidxcd;
SELECT index_name, stat_name, stat_description
FROM mysql.innodb_index_stats
WHERE database_name = 'test' AND table_name = 't';
index_name stat_name stat_description
GEN_CLUST_INDEX n_diff_pfx01 DB_ROW_ID
GEN_CLUST_INDEX n_leaf_pages Number of leaf pages in the index
GEN_CLUST_INDEX size Number of pages in the index
DROP TABLE t;
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