Query explain plan in a distributed data management system
If the values are not basically the same, data is unevenly distributed. The value of this parameter is in the format of total rows(maximum number of rows/average number of rows/minimum number of rows). Example: rows=80(20/4/0). mem: the maximum, average, and minimum memory ...
This distributed explain plan provides visibility into how a query was answered by each node in the cluster. For example, one node may have applied the filters of the query in one sequence, while another node may have used a different sequence. Additionally, the distributed query explain plan ...
A customer encountered a performance failure in its database system where a large number of transactions were congested. The direct cause was that CPU utilization reaches 100% on some OBServer nodes, which means that transactions cannot be processed normally. Based on the analysis of theGV$OB_SQL...
Explain complex systems using visuals and simple terms. Whether you're preparing for a System Design Interview or you simply want to understand how systems work beneath the surface, we hope this repository will help you achieve that. Table of Contents ...
First, we differentiate between different types of electricity tariffs, including a general willingness to use time- variant tariffs, TOU tariffs, CPP tariffs, and RTP tariffs. We pay attention to whether this stated willingness varies across the different offered tariffs, particular with regards to ...
Subsequently, we ran a second mixed-effect logistic regression to estimate the relationship between each of the nine types of situational change with event segmentation probability for both samples. In this analysis, the multicollinearity was not a concern since all variance inflation factors (VIF) we...
distributionWhether the statement was distributed or local. Ifdistributionisfull, execution of the statement is performed by multiple nodes in parallel, then the results are returned by the gateway node. Iflocal, the execution plan is performed only on the gateway node. Even if the execution plan...
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 ...
Developer Guide(Distributed) Database System Overview Database Security Database Quick Start Development and Design Proposal Application Development Guide SQL OptimizationSQL Reference GaussDB SQL Keywords Data Types Character Sets and Collations Constant and Macro...