https://dev.mysql.com/gone-away.html
The most common reason for the MySQL server has gone away error is that the server timed out and closed the connection. You can change the time limit by setting the wait_timeout variable when you start mysqld. You got a timeout from the TCP/IP ...
https://dev.mysql.com/group-replication-responses-failure-rejoin.html
The group_replication_autorejoin_tries system variable, which is available from MySQL 8.0.16, makes a member that has been expelled or reached its unreachable majority timeout try to rejoin the group automatically. When the member's expulsion or ...
https://dev.mysql.com/innodb-consistent-read.html
A consistent read means that InnoDB uses multi-versioning to present to a query a snapshot of the database at a point in time. The query sees the changes made by transactions that committed before that point of time, and no changes made by later or ...The exception to this rule is that the query sees the changes made by earlier statements within the same ...
https://dev.mysql.com/innodb-fulltext-index.html
The caching and batch flushing behavior avoids frequent updates to auxiliary index tables, which could result in concurrent access issues during busy insert and update times. If you create a full-text index at CREATE TABLE time and do not specify an ... FULLTEXT indexes are created on text-based columns (CHAR, VARCHAR, or TEXT columns) to help speed up queries and DML operations on data contained within those columns, omitting any words that are defined as ...
https://dev.mysql.com/innodb-information-schema-examples-compression-sect.html
Compressing or uncompressing pages has consumed less than a second since the time the statistics were reset, because the columns COMPRESS_TIME and UNCOMPRESS_TIME are zero. This copying of SUM(PAGE_SIZE*RELOCATION_OPS) bytes has consumed less than a ... Example 15.1 Using the Compression Information Schema Tables The following is sample output from a database that contains compressed tables (see Section 15.9, “InnoDB Table and Page Compression”, INNODB_CMP, INNODB_CMP_PER_INDEX, and ...
https://dev.mysql.com/innodb-memcached-setup.html
mysql> source MYSQL_HOME/share/innodb_memcached_config.sql Running the innodb_memcached_config.sql script is a one-time operation. Activate the daemon_memcached plugin by running the INSTALL PLUGIN statement: mysql> INSTALL PLUGIN daemon_memcached ... This section describes how to set up the daemon_memcached plugin on a MySQL ...
https://dev.mysql.com/innodb-memcached-txn.html
When a memcached operation inserts, updates, or deletes data in the underlying InnoDB table, the change might be committed to the InnoDB table instantly (if daemon_memcached_w_batch_size=1) or some time later (if the daemon_memcached_w_batch_size ...
https://dev.mysql.com/innodb-standard-monitor.html
Status This section shows the timestamp, the monitor name, and the number of seconds that per-second averages are based on. The number of seconds is the elapsed time between the current time and the last time InnoDB Monitor output was printed. The ...
https://dev.mysql.com/innodb-statistics-estimation.html
To improve the start up time of the mysql client and to updating statistics, you can turn off auto-rehash using the --disable-auto-rehash option. InnoDB detects that 1 / 16 of table has been modified since the last time statistics were updated.
https://dev.mysql.com/innodb-trx-table.html
TRX_WAIT_STARTED The time when the transaction started waiting on the lock, if TRX_STATE is LOCK WAIT; otherwise NULL. TRX_ADAPTIVE_HASH_TIMEOUT Whether to relinquish the search latch immediately for the adaptive hash index, or reserve it across ...
