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https://dev.mysql.com/doc/internals/en/optimizer-tracing-typical-usage.html
# Turn tracing on (it's off by default): SET optimizer_trace="enabled=on"; SELECT ...; # your query here SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE; # possibly more queries... # When done with tracing, disable it: SET ...
https://dev.mysql.com/doc/internals/en/optimizer.html
This chapter describes the operation of the MySQL Query optimizer, which is used to determine the most efficient means for executing queries.
https://dev.mysql.com/doc/internals/en/privilege-checking.html
In complex scenarios where the query uses SQL SECURITY DEFINER views or stored routines, it may be that a user is denied from seeing the trace of its query because it lacks some extra privileges on those objects. In that case, the trace will be ...
https://dev.mysql.com/doc/internals/en/selectexplain.html
For an EXPLAIN statement, for every SELECT, mysql_select will be called with option SELECT_DESCRIBE. For every SELECT in a given union, mysql_explain_union will call mysql_explain_select. mysql_select creates a JOIN for select if it does not ...
https://dev.mysql.com/doc/ndbapi/en/mccj-clusterj-results.html
4.3.1.21.1 Synopsis public interface Results<E> extends, Iterable<E> {// Public Methods public abstract Iterator<E> iterator();} 4.3.1.21.2 iterator() public abstract Iterator<E> iterator(); Specified by: Method iterator in interface Iterable Get an ...
https://dev.mysql.com/doc/ndbapi/en/ndb-column.html
Columns stored on disk mean that less RAM is required overall but such columns cannot be indexed, and are potentially much slower to access. This section provides information about the Column class, which models a column in an NDBCLUSTER table. The ...
https://dev.mysql.com/doc/ndbapi/en/overview-operations.html
An NdbTransaction consists of a list of operations, each of which is represented by an instance of NdbOperation, NdbScanOperation, NdbIndexOperation, or NdbIndexScanOperation (that is, of NdbOperation or one of its child classes). See Section ...
https://dev.mysql.com/doc/relnotes/connector-cpp/en/news-8-0-14.html
Configuration Notes Packaging Notes X DevAPI Notes Configuration Notes These CMake options have been added to enable more fine-grained specification of installation directories. (Bug #28045358) Packaging Notes Previously, Connector/C++ binary ...
https://dev.mysql.com/doc/relnotes/connector-cpp/en/news-8-0-22.html
some queries / inserts / updates std::string path= "/tmp"; conn->setClientOption(OPT_LOAD_DATA_LOCAL_DIR, path); // LOAD LOCAL DATA DIR ... Compilation Notes Connection Management Notes Legacy (JDBC API) Notes Bugs Fixed Compilation Notes ...
https://dev.mysql.com/doc/relnotes/connector-cpp/en/news-8-4-0.html
(WL #16154) Setting query attributes for executed queries now supports prepared statements. Security Notes Functionality Added or Changed Bugs Fixed Security Notes For platforms on which OpenSSL libraries are bundled, the linked OpenSSL library for ...