static - In static mode, explain doesn't run the query, but instead prints only the static structure of the query plan. details - In details mode, explain runs the query, and includes dynamic aspects of the query plan. These may include the number of intermediate bindings flowing through ...
IO_COST- IO cost of the operation assigned to this step by the optimizer, NULL for rule-based optimizer CARDINALITY- Estimated number of rows produced by this step OPTIMIZER- RULE or CHOOSE ACCESS_PREDICATES- Predicate to locate rows in the access structure. FILTER_PREDICATES- Predicate that wil...
Researchers have found that < large fish are more likely than small fish to contain high levels of mercury.> <>中的句子为开头Researchers have found的宾语 more than 为大鱼类和小鱼类的比较 研究人员发现大鱼比小鱼可能含有更高的汞 to explain
TheDESCRIBEandEXPLAINstatements are synonyms. In practice, theDESCRIBEkeyword is more often used to obtain information about table structure, whereasEXPLAINis used to obtain a query execution plan (that is, an explanation of how MySQL would execute a query). ...
CARDINALITY- Estimated number of rows produced by this step OPTIMIZER- RULE or CHOOSE ACCESS_PREDICATES- Predicate to locate rows in the access structure. FILTER_PREDICATES- Predicate that will filter rows before returning them from this step ...
The structure of the skin is composed of two layers called the dermis and the epidermis. The epidermis is the outermost layer with the dermis...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your t...
The GHuST framework is comprised of 12 metrics that analyze how 2- and 3-node graphlets shape the structure of networks. The main strengths of the GHuST framework are enhanced topological description, size independence, and computational simplicity. It allows for straight comparison among different...
Briefly explain the purpose of the loop, or iteration, structure. Then provide an original example algorithm with the loop structure. Why is a bitmap index used in data warehousing? How does cloud storage work? Do you always need to get the largest amount of RAM possible? Why or why not...
The precise effects of this variable are described later in this section. For complex statements, the JSON output can be quite large; in particular, it can be difficult when reading it to pair the closing bracket and opening brackets; to cause the JSON structure's key, if it has one, ...
4 Pointer to the return code structure I/O CHAR(*) Threadsafe: Conditional; see Usage Notes.The Visual Explain (QQQVEXPL) API is used to create a query graph that graphically displays the execution of an SQL statement. You can use this tool to see information about both static and dynam...