数据可能存在倾斜:shuffle data xxx in different shards! max rows is 20, min rows is 0。 说明 Advice的结果只是根据当前SQL的Explain Analyze结果给出的建议,不一定完全适用,需要根据业务具体分析,并合理采取相应的操作。 Cost耗时 Cost代表Query的总耗时以及在每个阶段运行的详细耗时,可以通过每个阶段的耗时初步...
In most cases, fixed plans are used for point queries on row-oriented tables that are configured with primary keys. If queries on row-oriented tables that are configured with primary keys do not use fixes plans, indexes of the Index Seek type are used. For more information, see Row-...
“CAP prohibits only a tiny part of the design space: perfect availability and consistency in the presence of partitions, which are rare”. Quoted from the paper: CAP Twelve Years Later: How the “Rules” Have Changed. The theorem is about 100% availability and consistency. A more realistic ...
To learn the output membership functions for each rule, first obtain the rule parameter settings from the initial FISfisTin. Get [~,~,rule] = getTunableSettings(fisTin); Then, specify that the antecedent membership functions are fixed during the tuning process. ...
You should avoid the now obsolete RULE hint if at all possible. That hint causes the rule-based optimizer to be used. The rule-based optimizer uses a fixed set of rules when determining the execution plan for a statement and doesn't attempt to factor in the ultimate cost of executing that...
“CAP prohibits only a tiny part of the design space: perfect availability and consistency in the presence of partitions, which are rare”. Quoted from the paper: CAP Twelve Years Later: How the “Rules” Have Changed. The theorem is about 100% availability and consistency. A more realistic...