OceanBase 在 V4.3.0 版本实现了新向量化引擎,更改为 Column 数据格式描述,同时也对一批常用算子和表达式进行了重新实现,如 HashJoin、AGGR、HashGroupBy、Exchange(DTL Shuffle) 等 10 余项算子,关系运算、逻辑运算、算数运算等 20 余项 MySQL 表达式。 内存格式优化:新的内存数据格式提供了按列存放的数据结构,对于...
RBO as a functionality is no longer supported. RBO still exists in Oracle 10gRelease 1, but is an unsupported feature. No code changes have been made to RBO and no bug fixes are provided. Oracle supports only the query optimizer, and all applications running on Oracle Database 10gRelease 1...
Each element, or value, for a collection is the same datatype. In Oracle8i, collections of complex types can be VARRAYs or nested tables. A VARRAY contains a variable number of ordered elements. The VARRAY datatype can be used for a column of a table or an attribute of an object type...
That digital identity wallet we talked about before contains items of value, including PII, account and credit card data, a digital trail of where we’ve been online, and more. Privacy is about controlling who has access to that information, and that comes down to data protection technologies...
The possible values for this parameter are ALL, ORACLE, and AUTO. The default value is AUTO. DBMS_STATS.GATHER*_STATS obeys the following hierarchy for parameter values; parameter values explicitly set in the command overrule everything. If the parameter has not been set in the command, ...
By default, value encoding is chosen when the sample of distinct values in the column is large enough - otherwise hash encoding usually provides better compression. It is possible for Analysis Services to change the encoding method after the column is partially processed based on further information...
By default, value encoding is chosen when the sample of distinct values in the column is large enough - otherwise hash encoding usually provides better compression. It is possible for Analysis Services to change the encoding method after the column is partially processed based on further information...
[11887] [YSQL] Include the index table ID when ybctid DocKey isn't found in main table [11911] [YSQL] Use correct tuple descriptor [11916] [xCluster] Eliminate master leader RPC when updating peers [11918] [YSQL] Disallow pushing down RowComparisonExpression when there is a hash column...
This option allows you to create a dump from a MySQL 8.2 or newer server that is compatible with older versions of MySQL; its value, one of those listed here, determines the compatibility of replication terminology used in the dump: SERVER: Gets the version of the server and uses the ...
The format for a log error resulting from a table-level property mismatch is shown here, where property is the property name, ndb_value is the property value as stored in the NDB dictionary, and mysqld_value is the value of the property as stored in the MySQL data dictionary: Diff in...