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https://dev.mysql.com/mysql-cluster-limitations-transactions.html
NDBCLUSTER stores only part of a column value that uses any of MySQL's BLOB or TEXT data types in the table visible to MySQL; the remainder of the BLOB or TEXT is stored in a separate internal table that is not accessible to MySQL. Important When ...
https://dev.mysql.com/mysql-cluster-ndbd-definition.html
For data nodes, this is an integer in the range 1 to 144 inclusive. The NodeGroup parameter is chiefly intended for use in adding a new node group to a running NDB Cluster without having to perform a rolling restart. Communication between nodes in ... The [ndbd] and [ndbd default] sections are used to configure the behavior of the cluster's data ...
https://dev.mysql.com/mysql-fetch-field-direct.html
MYSQL_FIELD *mysql_fetch_field_direct(MYSQL_RES *result, unsigned int fieldnr) Given a field number fieldnr for a column within a result set, returns that column's field definition as a MYSQL_FIELD structure. unsigned int num_fields; unsigned int ...Use this function to retrieve the definition for an arbitrary ...
https://dev.mysql.com/mysql-fetch-row.html
If row holds the return value from a call to mysql_fetch_row(), pointers to the values are accessed as row[0] to row[mysql_num_fields(result)-1]. Empty fields and fields containing NULL both have length 0; you can distinguish these by checking the ...Its asynchronous counterpart is mysql_fetch_row_nonblocking(), for use by applications that require asynchronous communication with the ...
https://dev.mysql.com/mysql-field-count.html
unsigned int mysql_field_count(MYSQL *mysql) Returns the number of columns for the most recent query on the connection. The normal use of this function is when mysql_store_result() returned NULL (and thus you have no result set pointer). An ...In ...
https://dev.mysql.com/mysql-library-init.html
int mysql_library_init(int argc, char **argv, char **groups) Call this function to initialize the MySQL client library before you call any other MySQL function. #include <mysql.h> #include <stdlib.h> int main(void) { if (mysql_library_init(0, NULL, ...Note To avoid memory leaks after the application is done using the library (for example, after closing the connection to the server), be sure to call mysql_library_end() ...
https://dev.mysql.com/partitioning-key.html
NDB Cluster uses MD5() for this purpose; for tables using other storage engines, the server employs its own internal hashing function which is based on the same algorithm as PASSWORD(). Unlike the case with other partitioning types, columns used for ... Partitioning by key is similar to partitioning by hash, except that where hash partitioning employs a user-defined expression, the hashing function for key partitioning is supplied by the MySQL ...
https://dev.mysql.com/replication-gtids-functions.html
CREATE FUNCTION GTID_IS_EQUAL(gtid_set_1 LONGTEXT, gtid_set_2 LONGTEXT) RETURNS INT RETURN GTID_SUBSET(gtid_set_1, gtid_set_2) AND GTID_SUBSET(gtid_set_2, gtid_set_1)| This function returns nonzero (true) if two GTID sets are disjoint. CREATE ...
https://dev.mysql.com/row-constructor-optimization.html
Consider the following table, which has a primary key on (c1, c2, c3): CREATE TABLE t1 ( c1 INT, c2 INT, c3 INT, c4 CHAR(100), PRIMARY KEY(c1,c2,c3) ); In this query, the WHERE clause uses all columns in the index. For example, these two statements ...
https://dev.mysql.com/scalar-subqueries.html
For example, LIMIT requires literal integer arguments, and LOAD DATA requires a literal string file name. In its simplest form, a subquery is a scalar subquery that returns a single value. A scalar subquery is a simple operand, and you can use it ...
Document created the 26/06/2006, last modified the 26/10/2018
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