What is MySQL query log?
The general query log is a general record of what mysqld is doing. The server writes information to this log when clients connect or disconnect, and it logs each SQL statement received from clients.
How do I log a SQL query in MySQL?
How to show the queries log in MySQL?
- Enable Query logging on the database. SET global general_log = 1; SET global log_output = ‘table’;
- Now you can view the log by running this query: SELECT * FROM mysql. general_log;
- If you want to disable query logging on the database, run this query: SET global general_log = 0;
How do I find Mysqli error?
2 Answers. Just simply add or die(mysqli_error($db)); at the end of your query, this will print the mysqli error.
What is the general query log table in MySQL?
The mysql.general_log table stores the contents of the General Query Log if general logging is active and the output is being written to table (see Writing logs into tables). It contains the following fields:
How to specify the log destination in MySQL?
To specify the log destination, use the log_output system variable (as described in Section 5.4.1, “Selecting General Query Log and Slow Query Log Output Destinations” ). If you specify the TABLE log destination, see Log Tables and “Too many open files” Errors .
When to use triggers in MySQL to log table changes?
For deletes, log a removal operation showing the values in the deleted row. For this example we will specify AFTER triggers because we only want the log table to track successful changes to the data table (BEFORE triggers will activate even if row-change operation fails).
When do I log to the log table?
The data table contains all the information pertaining to the current data values. When an action occurs (such as an insert, update, or delete) to that table we want it logged to the log table, data_log. You will notice 2 differences between the tables. The id field has the nonunique index rather than being a primary key.