In MySQL, we can use the sys.ps_is_instrument_default_enabled() function to check whether a given Performance Schema instrument is enabled by default.
The function returns YES or NO, depending on whether the instrument is enabled by default.
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Understanding the sys.ps_is_instrument_default_timed()Â Function in MySQL
In MySQL, we can use the sys.ps_is_instrument_default_timed() function to check whether a given Performance Schema instrument is timed by default.
The function returns YES or NO, depending on whether the instrument is timed by default.
Understanding the sys.ps_is_thread_instrumented()Â Function in MySQL
In MySQL, we can use the sys.ps_is_thread_instrumented() function to check whether Performance Schema instrumentation for a given connection ID is enabled.
The function returns YES or NO, depending on whether the instrumentation is enabled for the given connection. It can also return UNKNOWN if the connection ID is unknown, and NULL if the connection ID is NULL.
Understanding the sys.version_patch()Â Function in MySQL
In MySQL, we can use the sys.version_patch() function to return the patch release version of the MySQL server.
For example, if we’re using MySQL 8.0.33, sys.version_patch() returns 33.
Understanding the sys.version_minor()Â Function in MySQL
In MySQL, we can use the sys.version_minor() function to return the minor release version of the MySQL server.
Understanding the sys.version_major()Â Function in MySQL
In MySQL, we can use the sys.version_major() function to return the major release version of the MySQL server.
Understanding the PS_CURRENT_THREAD_ID() Function in MySQL
In MySQL, we can use the PS_CURRENT_THREAD_ID() function to get the Performance Schema thread ID assigned to the current connection.
The PS_CURRENT_THREAD_ID() function was added in MySQL 8.0.16, and it does the same thing as PS_THREAD_ID(CONNECTION_ID()).
Understanding the FORMAT_PICO_TIME() Function in MySQL
In MySQL, format_pico_time() is a Performance Schema function that converts a numeric Performance Schema latency or wait time in picoseconds into a human-readable format. It returns a string consisting of a value and a units indicator.
MySQL DEFAULT() Function Explained
In MySQL, the DEFAULT() function returns the default value for a given column in the database.
If the column doesn’t have a default value, an error is returned.
Continue readingHow AUTO_INCREMENT Works in MySQL
In MySQL, we can include the AUTO_INCREMENT attribute within a column definition in order to create an auto-incrementing column.
Generally, when we do this MySQL will automatically generate a value for us whenever we insert a new row into the table. I say “generally” because we can still explicitly insert our own value if that’s required.
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