tables provide information about server status variables. Their
contents correspond to the information produced by the
STATUS statements (see Section 18.104.22.168, “
SHOW STATUS Syntax”).
Beginning with MySQL 5.1.19, the
VARIABLE_VALUE column for each of these
tables is defined as
Previously, this column had the data type
DECIMAL(22,7), but was changed to avoid
loss of data when working with status variables whose values
were strings (Bug #26994).