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https://dev.mysql.com/doc/refman/9.7/en/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 in 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/doc/refman/9.7/en/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 ... Full-text indexes are created on text-based columns (CHAR, VARCHAR, or TEXT columns) to speed up queries and DML operations on data contained within those ...
https://dev.mysql.com/doc/refman/9.7/en/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 17.1 Using the Compression Information Schema Tables The following is sample output from a database that contains compressed tables (see Section 17.9, “InnoDB Table and Page Compression”, INNODB_CMP, INNODB_CMP_PER_INDEX, and ...
https://dev.mysql.com/doc/refman/9.7/en/innodb-online-ddl-operations.html
A newly created secondary index contains only the committed data in the table at the time the CREATE INDEX or ALTER TABLE statement finishes executing. When you add a primary key using the ALGORITHM=COPY clause, MySQL converts NULL values in the ...
https://dev.mysql.com/doc/refman/9.7/en/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/doc/refman/9.7/en/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/doc/refman/9.7/en/keyring-hashicorp-plugin.html
Note The operations described in this step are required only when starting Vault the first time, to obtain the unseal key and root token. Note The operations described in this step are needed only the first time the Vault instance is run. Note The ... Note The keyring_hashicorp plugin is an extension included in MySQL Enterprise Edition, a commercial ...
https://dev.mysql.com/doc/refman/9.7/en/lateral-derived-tables.html
A derived table cannot normally refer to (depend on) columns of preceding tables in the same FROM clause. A derived table may be defined as a lateral derived table to specify that such references are permitted. Nonlateral derived tables are ...
https://dev.mysql.com/doc/refman/9.7/en/linux-installation-sles-repo.html
For example, to enable the Innovation track on SLES 15 which installs MySQL 9.6: $> sudo zypper modifyrepo -e mysql-innovation-community $> sudo zypper modifyrepo -e mysql-tools-innovation-community You should only enable a subrepository for one ...
https://dev.mysql.com/doc/refman/9.7/en/log-file-maintenance.html
When using MySQL with logging enabled, you may want to back up and remove old log files from time to time and tell MySQL to start logging to new files. If you are using replication, you should specify an expiration period that is no lower than the ... As described in Section 7.4, “MySQL Server Logs”, MySQL Server can create several different log files to help you see what activity is taking ...