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https://dev.mysql.com/doc/refman/8.0/en/sys-schema-reference.html
The sys schema includes tables and triggers, views, and stored procedures and functions.
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-elements.html
The thread_handling system variable has a value of loaded-dynamically when the server successfully loads the thread pool plugin. The other related system variables are implemented by the thread pool plugin and are not available unless it is enabled.
https://dev.mysql.com/doc/refman/8.0/en/trace-general-structure.html
A trace follows the actual execution path very closely; for each join, there is a join preparation object, a join optimization object, and a join execution object. Query transformations (IN to EXISTS, outer join to inner join, and so on), ...Calls ...
https://dev.mysql.com/doc/refman/8.0/en/using-stack-trace.html
You can use this to find out where (and maybe why) mysqld died. stack_bottom = 0x41fd0110 thread_stack 0x40000 mysqld(my_print_stacktrace+0x32)[0x9da402] mysqld(handle_segfault+0x28a)[0x6648e9] /lib/libpthread.so.0[0x7f1a5af000f0] ... On some ...
https://dev.mysql.com/doc/refman/8.0/en/window-function-restrictions.html
The SQL standard imposes a constraint on window functions that they cannot be used in UPDATE or DELETE statements to update rows. Note that a single query may use multiple SELECT clauses, and each of these clauses supports up to 127 windows. The ...
https://dev.mysql.com/doc/refman/8.0/en/windows-symbolic-links.html
On Windows, you can create a symlink using the mklink command. For this example, we use D:\data\mydb, and a database named mydb. Using Windows Explorer or the command line, move the directory mydb from the data directory to D:\data, replacing the ...
https://dev.mysql.com/doc/refman/8.0/en/x-plugin-status-variables.html
If compression is used for the connection, this figure comprises compressed message payloads measured before decompression (Mysqlx_bytes_received_compressed_payload), any items in compressed messages that were not compressed such as X Protocol ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-build-configuration.html
For example, to exclude stage and statement instrumentation, do this: $> cmake . If you install MySQL over a previous installation that was configured without the Performance Schema (or with an older version of the Performance Schema that has ...It ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-instrument-filtering.html
The setup_instruments table lists the available instruments: mysql> SELECT NAME, ENABLED, TIMED FROM performance_schema.setup_instruments; +---------------------------------------------------+---------+-------+ | NAME | ENABLED | TIMED | ...| ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-cpudata-1sec.html
The cpudata_1sec table provides data about CPU usage per second over the last 20 seconds.