Performance Schema Summary Tables SQL_STATE: 70100  SUM_ERROR_RAISED: 1 SUM_ERROR_HANDLED: 0 FIRST_SEEN: 2016-06-28 11:01:49 LAST_SEEN: 2016-06-28 11:01:49 Each error summary table has one or more grouping columns to indicate how the table aggregates errors: • events_errors_summary_by_account_by_error  has  USER ,  HOST , and  ERROR_NUMBER  columns. Each row summarizes events for a given account (user and host combination) and error. • events_errors_summary_by_host_by_error  has  HOST  and  ERROR_NUMBER  columns. Each row summarizes events for a given host and error. • events_errors_summary_by_thread_by_error  has  THREAD_ID  and  ERROR_NUMBER  columns. Each row summarizes events for a given thread and error. • events_errors_summary_by_user_by_error  has  USER  and  ERROR_NUMBER  columns. Each row summarizes events for a given user and error. • events_errors_summary_global_by_error  has an  ERROR_NUMBER  column. Each row summarizes events for a given error. • SUM_ERROR_RAISED • SUM_ERROR_HANDLED • FIRST_SEEN ,  LAST_SEEN • events_errors_summary_by_account_by_error : • events_errors_summary_by_host_by_error : • events_errors_summary_by_thread_by_error : •Primary key on ( THREAD_ID ,  ERROR_NUMBER ) •Primary key on ( HOST ,  ERROR_NUMBER ) •Primary key on ( USER ,  HOST ,  ERROR_NUMBER ) • events_errors_summary_by_user_by_error : •Primary key on ( USER ,  ERROR_NUMBER ) 5075 The error summary tables have these indexes: A  NULL  row in each error summary table is used to aggregate statistics for all errors that lie out of range of the instrumented errors. For example, if MySQL Server errors lie in the range from  M  to  N  and an error is raised with number  Q  not in that range, the error is aggregated in the  NULL  row. The  NULL  row is the row with  ERROR_NUMBER=0 ,  ERROR_NAME=NULL , and  SQLSTATE=NULL . Timestamp indicating when the error was first seen and most recently seen. This column aggregates the number of times the error was handled by an SQL exception handler. This column aggregates the number of times the error occurred. Each error summary table has these summary columns containing aggregated values: