Now have a saas multi-tenancy project, USES is sharing the mysql database, sharing table, in the form of a list multiple tenants share tableA, how to monitor each tenant changes the size of the space occupied by the table? TableA table is a dar to identify each tenant, i.e. dar is the tenant id, each tenant in that list is stored, there are many records; In the tenant's information is in tableB, I now to monitor each tenant table space occupied tableA table size, at the same time when the corresponding to the tenant in tableA add or delete records in the table, after monitoring the tenant changes the storage size, this should be row level monitoring, this how to do?