Dependencies between all operators in a task The operator string describes the execution semantics of a task. Operator string structure: In Task M2: Data source: mf_mc_bj.sale_detail_jt/sale_date=2013/region=china # Data source describes the input of the task. TS: mf_mc_bj.sale_deta...
The DFE engine translates every query into a pipeline of operators. Starting from the first operator, intermediate solutions flow from one operator to the next through this operator pipeline. Each row in the explain table represents a result, up to the point of evaluation. The operators that can...
For descriptions of the different types, see EXPLAIN Join Types. possible_keys (JSON name: possible_keys) The possible_keys column indicates the indexes from which MySQL can choose to find the rows in this table. Note that this column is totally independent of the order of the tables as...
EXPLAIN Join Types The type column of EXPLAIN output describes how tables are joined. In JSON-formatted output, these are found as values of the access_type property. The following list describes the join types, ordered from the best type to the worst: system The table has only one ...
Describe using both a pseudocode, and words to explain the pseudocode in detail, an algorithm for the multiplication of non-negative integers. While devising the algorithm, split the operations into two parts: i. The multiplication of a single digit by...
Cause: The capability in question is not supported when the materialized view uses set operators such as UNION, UNION ALL, MINUS, and so on. Action: Re-phrase the query to avoid the use of set operators. QSM-02022 aggregate selections Cause: The capability in question is not supported whe...
The join type.For descriptions of the different types, see EXPLAIN Join Types. --对表所使用的访问方式。 2.1.5 possible_keys Thepossible_keys column indicates which indexes MySQL can choose from use to findthe rows in this table. Note that this column is totally independent of theorder of th...
Because all variables doesn't have the same type, the operations that can be performed on them are different. ## Kin's Data Types **_Kin_** has 5 Datatypes: 1. String 2. Number 3. Boolean 4. Null 5. Object The Object Datatype The object data type can contain: 1. An object 2....
There are two types of predicates: ACCESS and FILTER. The ACCESS predicates for an index are used to fetch the relevant blocks by applying search criteria to the appropriate columns. The FILTER predicates are evaluated after the blocks have been fetched. ALL Includes the information shown ...
What makes cloud computing different? Types of cloud computing Advantages and disadvantages of cloud computing Cloud computing trends Is cloud computing really better for the environment? Find out moreWhat is cloud computing?Cloud computing means that instead of all the computer hardware and software yo...