Performance Schema Miscellaneous Tables The number of errors due to SSL problems. The number of errors caused by exceeding per-user connection quotas. See Section 6.2.20, “Setting Account Resource Limits” . The number of errors caused by exceeding per-user connections-per-hour quotas. See Section 6.2.20, “Setting Account Resource Limits” . The number of errors related to the default database. For example, the database does not exist or the user has no privileges to access it. The number of errors caused by execution failures of statements in the  init_connect  system variable value. The number of errors local to the server implementation and not related to the network, authentication, or authorization. For example, out-of-memory conditions fall into this category. The number of other, unknown errors not accounted for by other columns in this table. This column is reserved for future use, in case new error conditions must be reported, and if preserving the backward compatibility and structure of the  host_cache  table is required. The timestamp of the most recent connection attempt seen from the client in the  IP  column. The timestamp of the first connection attempt seen from the client in the  IP  column. The timestamp of the first error seen from the client in the  IP  column. The timestamp of the most recent error seen from the client in the  IP  column. TRUNCATE TABLE  is permitted for the  host_cache  table. It requires the  DROP  privilege for the table. Truncating the table flushes the host cache, which has the effects described in Flushing the Host Cache. The  host_cache  table has these indexes: 27.12.21.3 The log_status Table 5083 •Index on ( HOST ) •Primary key on ( IP ) • LAST_ERROR_SEEN • FIRST_ERROR_SEEN • LAST_SEEN • FIRST_SEEN • COUNT_UNKNOWN_ERRORS • COUNT_LOCAL_ERRORS • COUNT_INIT_CONNECT_ERRORS • COUNT_DEFAULT_DATABASE_ERRORS • COUNT_MAX_USER_CONNECTIONS_PER_HOUR_ERRORS • COUNT_MAX_USER_CONNECTIONS_ERRORS