How do I enable debugging in MySQL?
If you have some very specific problem, you can always try to debug MySQL. To do this you must configure MySQL with the -DWITH_DEBUG=1 option. You can check whether MySQL was compiled with debugging by doing: mysqld –help. If the –debug flag is listed with the options then you have debugging enabled.
What is Ifnull in MySQL?
MySQL IFNULL() Function The IFNULL() function returns a specified value if the expression is NULL. If the expression is NOT NULL, this function returns the expression.
How do I debug a stored procedure in MySQL?
To start the debugger, follow these steps:
- Choose a connection in the Visual Studio Server Explorer.
- Expand the Stored Procedures folder. Only stored procedures can be debugged directly.
- Click on a stored procedure node, then right-click and from the context menu choose Debug Routine.
What does the option Datadir do?
Explanation: At the server startup the data directory location is specified by using a ‘–datadir=dir_name’ option. It is helpful for naming a location other than the compiled in default. Explanation: The data directory location is checked by the ‘datadir’ variable.
How do I change the startup parameters in SQL Server?
In SQL Server Configuration Manager, click SQL Server Services. In the right pane, right-click SQL Server (), and then click Properties. On the Startup Parameters tab, in the Specify a startup parameter box, type the parameter, and then click Add.
Which is better InnoDB or MyISAM?
The performance of InnoDB for large volumes of data is better as compared to MyISAM. MyISAM doesn’t support transactional properties and is faster to read. As compared to InnoDB, the performance for a high volume of data is less.
Why Ifnull is used in SQL?
Definition and Usage The IFNULL() function returns a specified value if the expression is NULL. If the expression is NOT NULL, this function returns the expression.
Is the a way to debug stored procedure in SQL Server?
To debug a function, open the procedure calling that function and insert a breakpoint for the function you want to debug. Then, start debugging. Step through the code using the F11 key or Step Into, or press CTRL+F5 to move directly to the breakpoint. Press F11 or click Step Into to get inside the stored function.
Is ethereum smart contract free?
Ethereum Smart Contract Platform Features: Free to setup. Contract transactions are charged in gas.
What are the startup parameters in SQL Server?
Whenever SQL Server starts, it needs three startup parameters:
- Master database data file location (-d parameter)
- Errorlog file location (-e parameter)
- Master database transaction log file location (-l parameter)
How do I debug control settings in mysqld?
Here are some example debug control strings as they might be specified on a shell command line: For mysqld, it is also possible to change DBUG settings at runtime by setting the debug system variable. This variable has global and session values:
What is the “user” option in mysqld?
( “User” in this context refers to a system login account, not a MySQL user listed in the grant tables.) This option is mandatory when starting mysqld as root.
What are the default and minimum values of the mysqld options?
The default and minimum values are 6 times the page size, and the value must be a multiple of the page size. Lock the mysqld process in memory. This option might help if you have a problem where the operating system is causing mysqld to swap to disk.
When are plugins loaded early in mysqld?
Each named plugin is loaded early for a single invocation of mysqld only. After a restart, the plugin is not loaded early unless –early-plugin-load is used again. If the server is started using –initialize or –initialize-insecure, plugins specified by –early-plugin-load are not loaded.