Viewing the Error Log

View performance_schema.error_log that contains errors, warnings, and status updates from the Health Monitor, InnoDB storage engine, RAPID secondary engine, replication channel, and MySQL Server.

Using a Command-Line Client

Use a command-line client such as MySQL Client or MySQL Shell to view performance_schema.error_log.

This task requires the following:

A running DB system.
A DB system connected using MySQL Shell, MySQL Client, or any command-line client of your choice.

Do the following to view performance_schema.error_log using MySQL Shell or MySQL Client:

Note

performance_schema.error_log is available in the SQL execution mode only.

Run the following command:

SELECT * FROM performance_schema.error_log;

(Optional) To filter the logs to show only errors, run the following command:
```
SELECT * FROM performance_schema.error_log WHERE PRIO='error'; 
```
(Optional) To filter the logs to only show errors from the HEALTH subsystem, run the following command:
```
SELECT * FROM performance_schema.error_log WHERE SUBSYSTEM IN
    ('HEALTH');
```
You can select from the following subsystems:
- HEALTH
- InnoDB
- RAPID
- Repl
- Server
(Optional) To filter on the HEALTH subsystem over a 2 hour time interval, run the following command:
```
SELECT * FROM performance_schema.error_log WHERE SUBSYSTEM = 'HEALTH' AND 
LOGGED > DATE_SUB(NOW(),INTERVAL 2 HOUR);
```
(Optional) To retrieve a count of how many instances of a specific error occurred in a single day, run the following command:
```
SELECT HOUR(LOGGED), COUNT(*) FROM error_log WHERE ERROR_CODE = 'MY-010914' AND 
LOGGED > DATE_SUB(NOW(),INTERVAL 1 DAY) GROUP BY HOUR(LOGGED);
```

(Optional) To retrieve a count of how many instances of a specific error occurred in a week, run the following command:

SELECT DAY(LOGGED), COUNT(*) FROM error_log WHERE ERROR_CODE = 'MY-010914' AND 
LOGGED > DATE_SUB(NOW(),INTERVAL 1 WEEK) GROUP BY DAY(LOGGED);

Without using any filters, you get a response similar to the following, which displays the time the event occurred, the thread ID, priority, error code (if present), subsystem, and text describing the event:

*************************** 1. row ***************************
    LOGGED: 2021-05-10 17:09:31.132868
 THREAD_ID: 0
      PRIO: Note
ERROR_CODE: MY-010096
 SUBSYSTEM: Server
      DATA: Ignoring --secure-file-priv value as server is running with --initialize(-insecure).
*************************** 2. row ***************************
    LOGGED: 2021-05-10 17:09:31.137469
 THREAD_ID: 0
      PRIO: Note
ERROR_CODE: MY-010949
 SUBSYSTEM: Server
      DATA: Basedir set to /usr/.
*************************** 3. row ***************************
    LOGGED: 2021-05-10 17:09:31.141389
 THREAD_ID: 0
      PRIO: System
ERROR_CODE: MY-013169
 SUBSYSTEM: Server
      DATA: /usr/sbin/mysqld (mysqld 8.0.24-u1-cloud) initializing of server in progress as process 12383
*************************** 4. row ***************************
    LOGGED: 2021-05-10 17:09:31.192341
 THREAD_ID: 0
      PRIO: Note
ERROR_CODE: MY-010458
 SUBSYSTEM: Server
      DATA: --initialize specified on an existing data directory.
*************************** 5. row ***************************
..............................
..............................

Related Topics

Oracle Cloud Infrastructure Documentation

Using a Command-Line Client