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mysql> select count(1) from (select table_id,count from mysql.stats_meta) a;
±---------+
| count(1) |
±---------+
| 4031 |
±---------+
1 row in set (0.87 sec)
mysql> select count(1) from (select table_id,hist_id,tot_col_size from mysql.stats_histograms where is_index=0 ) a ;
±---------+
| count(1) |
±---------+
| 496678 |
±---------+
1 row in set (0.42 sec)