PDF (US Ltr)
- 43.3Mb
PDF (A4)
- 43.4Mb
Man Pages (TGZ)
- 297.2Kb
Man Pages (Zip)
- 402.4Kb
Info (Gzip)
- 4.3Mb
Info (Zip)
- 4.3Mb
Search Results
https://dev.mysql.com/doc/refman/8.0/en/replication-semisync.html
Fully synchronous replication means failover from the source to any replica is possible at any time. The amount of slowdown is at least the TCP/IP roundtrip time to send the commit to the replica and wait for the acknowledgment of receipt by the ...
https://dev.mysql.com/doc/refman/8.0/en/replication-solutions-unexpected-replica-halt.html
In order for replication to be resilient to unexpected halts of the server (sometimes described as crash-safe) it must be possible for the replica to recover its state before halting. This global variable defaults to OFF and is read-only at ...This ...
https://dev.mysql.com/doc/refman/8.0/en/rewriter-query-rewrite-plugin-reference.html
Rewriter_number_reloads The number of times the rewrite_rules table has been loaded into the in-memory cache used by the Rewriter plugin. Rewriter_reload_error Whether an error occurred the most recent time that the rewrite_rules table was loaded ...
https://dev.mysql.com/doc/refman/8.0/en/roles.html
To specify mandatory roles at server startup, define mandatory_roles in your server my.cnf file: [mysqld] mandatory_roles='role1,role2@localhost,r3@%.example.com' To set and persist mandatory_roles at runtime, use a statement like this: SET PERSIST ...Like user accounts, roles can have privileges granted to and revoked from ...
https://dev.mysql.com/doc/refman/8.0/en/semijoins.html
A semijoin is a preparation-time transformation that enables multiple execution strategies such as table pullout, duplicate weedout, first match, loose scan, and materialization. For an inner join between two tables, the join returns a row from one ...The optimizer uses semijoin strategies to improve subquery execution, as described in this ...
https://dev.mysql.com/doc/refman/8.0/en/set.html
It also does not matter how many times a given element is listed in the value. When the value is retrieved later, each element in the value appears once, with elements listed according to the order in which they were specified at table creation time. A SET is a string object that can have zero or more values, each of which must be chosen from a list of permitted values specified when the table is ...
https://dev.mysql.com/doc/refman/8.0/en/setting-environment-variables.html
To have the settings take effect each time you log in, use the interface provided by your system or place the appropriate command or commands in a startup file that your command interpreter reads each time it starts. Environment variables can be ...
https://dev.mysql.com/doc/refman/8.0/en/show-profile.html
Note The SHOW PROFILE and SHOW PROFILES statements are deprecated; expect them to be removed in a future MySQL release. Use the Performance Schema instead; see Section 29.19.1, “Query Profiling Using Performance Schema”. To control profiling, ...
https://dev.mysql.com/doc/refman/8.0/en/sorted-index-builds.html
InnoDB performs a bulk load instead of inserting one index record at a time when creating or rebuilding indexes. Prior to the introduction of sorted index builds, index entries were inserted into the B-tree one record at a time using insert APIs.
https://dev.mysql.com/doc/refman/8.0/en/sql-prepared-statements.html
Using prepared statements with placeholders for parameter values has the following benefits: Less overhead for parsing the statement each time it is executed. The statement for a cursor is checked at cursor creation time, so the statement cannot be ...Typically, database applications process large volumes of almost-identical statements, with only changes to literal or variable values in clauses such as WHERE for queries and deletes, SET for updates, and VALUES for ...