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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/mysql-cluster-ndbinfo-threadstat.html
The values of the os_ru_utime, os_ru_stime, os_ru_minflt, os_ru_majflt, os_ru_nvcsw, and os_ru_nivcsw columns are obtained using the system getrusage() call, or the equivalent. Since this table contains counts taken at a given point in time, for ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-variables.html
Performance Schema status variables have the following meanings: Performance_schema_accounts_lost The number of times a row could not be added to the accounts table because it was full. Performance_schema_hosts_lost The number of times a row could ...Performance_schema_digest_lost The number of digest instances that could not be instrumented in the events_statements_summary_by_digest ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-tp-thread-group-stats-table.html
WAKE_THREAD_STALL_CHECKER The number of times the stall check thread decided to wake or create a thread to possibly handle some statements or take care of the waiter thread role. PRIO_KICKUPS The number of statements that have been moved from ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-fractional-seconds.html
MySQL 8.0 permits fractional seconds for TIME, DATETIME, and TIMESTAMP values, with up to microseconds (6 digits) precision.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-cpustat-1sec.html
Like cpustat_50ms and cpustat_20sec, this table shows 20 measurement sets per thread, each referencing a period of the named duration. The cpustat-1sec table provides raw, per-thread CPU data obtained each second for each thread running in the NDB ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-cpustat-20sec.html
Like cpustat_50ms and cpustat_1sec, this table shows 20 measurement sets per thread, each referencing a period of the named duration. The cpustat_20sec table provides raw, per-thread CPU data obtained each 20 seconds, for each thread running in the ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-cpustat-50ms.html
Like cpustat_1sec and cpustat_20sec, this table shows 20 measurement sets per thread, each referencing a period of the named duration. The cpustat_50ms table provides raw, per-thread CPU data obtained each 50 milliseconds for each thread running in ...