RU (Request Unit) 消耗 Request Unit (RU) 是资源管控对系统资源统一抽象的计量单位。执行计划顶层算子的 execution info 会显示 SQL 整体的 RU 消耗。 RU:273.842670 注意 该值仅表示本次执行的实际 RU 消耗。由于受缓存的影响(比如下推计算结果缓存),同一个 SQL 在每次执行时消耗的 RU 可能会不同。
At the top-level, SolutionInjection appears before everything else, with 1 unit out. Note that it doesn't actually inject any solutions. You can see that the next operator, DFESubquery, has 0 units in. After SolutionInjection at the top-level is the DFESubquery operator. DFESubquery encap...
Unit 3 of 6 Ask Learn Understand the EXPLAIN statementCompleted 100 XP 3 minutes Use the EXPLAIN statement to display the execution plan for the query. EXPLAIN can be used with any SELECT, INSERT, UPDATE, DELETE, VALUES, EXECUTE, DECLARE, or CREATE TABLE AS statement. EXPLAIN displays the ...
;/* Current nesting depth of ExecutorRun calls */staticintnesting_level=0;/* Is the current top-level query to be sampled? */staticboolcurrent_query_sampled=false;#define auto_explain_enabled() \(auto_explain_log_min_duration >= 0 && \(nesting_level == 0 || auto_explain_log_nested_...
The cost is an internal unit and is only displayed to allow for plan comparisons. Understanding the execution plan In order to determine if you are looking at a good execution plan or not, you need to understand how the Optimizer determined the plan in the first place. You should also be...
static void ExplainProperty(const char *qlabel, const char *unit, const char *value, bool numeric, ExplainState *es);static void ExplainDummyGroup(const char *objtype, const char *labelname, ExplainState *es);static void ExplainXMLTag(const char *tagname, int flags, ExplainState *es);...
Photo: Memory as it used to be in 1954. This closet-sized magnetic core memory unit (left), as tall as an adult, was made up of individual circuits (middle) containing tiny rings of magnetic material (ferrite), known as cores (right), which could be magnetized or demagnetized to store...
{"allocations requiring file extension":303,"blocks allocated":307,"blocks freed":1,"checkpoint size":1298432,"file allocation unit size":4096,"file bytes available for reuse":16384,"file magic number":120897,"file major version number":1,"file size in bytes":1331200,"minor version number"...
These often include a unit on logic and, for many students, will be the first and perhaps only place in which propositional logic is explicitly discussed. Our reasons for studying textbooks reflect those articulated by other authors of textbook analyses (e.g., Lockwood et al., 2017). First,...
What do you mean by memory unit? Suppose we have a (max) heap that stores integers. Given an integer k, print all the values in this heap that are greater than k. What would happen to the time complexity (Big-O) of the methods in an array implementation of a stack if the top of...