postgresql query tuning tools

As the web becomes more and more demanding on the performance of the system, the key to any system is how to ensure the performance of the system and can predict and locate the problem before performance problems occur. The system test before the system is on line and the performance monitoring of the whole system is the method to ensure the system to run with excellent performance. At the end of last year, I wrote an article about how to use Jprobe to discover and locate the performance bottlen

applications that need to perform many I/O operations, such as file servers, databases, and interactive shells, which expect smaller response times. They are limited by the I/O subsystem or network resources. for CPU-intensive workloads , you can check and count the code for CPU operations, and for I/o-intensive workloads , you can check and count the code that performs the most I/O operations. This allows for more targeted tuning. You can also use t

Original: SQL Server Tuning Series Advanced (query statement running several indicator value monitoring)ObjectiveIn the previous article, we analyzed how the query optimizer works, including: detailed operation steps of the query optimizer, analysis of filter conditions, optimization of index items, and other informati

) down log (in the domain directory, if there is no downtime, the kill-3 PID can be used if conditions permit (this action kills the process))Lite version:After the server hangs, execute the following command before restarting:JPS-VL query to the corresponding Java process, referred to as PIDJstat–gcutilpid >>/opt/tomcat/bin/gcutil.logVmstat3Jstackpid >/opt/tomcat/bin/jstack.logJmap-histo PID >/opt/tomcat/bin/histo.logNetwork aspects:Whiletrue; Do a=$

collection is not parallel.2, Tomcat's internal tuning(i) Prohibit DNS lookupSometimes our application may have to record the client's information in two ways, one is to record the digital IP address of the client, and the other is to find the real host name in the DNS data. DNS lookups increase network traffic, resulting in network latency. To eliminate this delay, we can ban DNS lookups. When our application calls the Getremotehost () method, it wi

Mysql tuning three steps (slow query and explain profile) often encounter some SQL problems in performance tests. In fact, the most problems encountered in performance tests over the past few years are databases, either high I/O or high cpu, Data Optimization plays an important role in performance testing, below I will introduce some of the three tools that are f

field, and by clicking the "+" before the grouping, you can see the details of the data under that grouping.How to cancel group by it? Right-click on the Group By field, select Remove from grouping, you can cancel, of course, you can also choose to drag the field directly to the same way to cancel.Group by BoxSelect the field, right click on select group by BOX, the interface shows as followsBy can only, Group by box essence is actually a sort of collation.SQL EditorFor students who are accusto

Label:ObjectiveIn the previous article, we analyzed how the query optimizer works, including: detailed operation steps of the query optimizer, analysis of filter conditions, optimization of index items, and other information.In this article we analyze the detection of several key indicator values in the course of our operation.These indicator values are analyzed to analyze the operation of the statement and

Read Catalogue Objective Technical preparation ObjectiveIn the previous article, we analyzed how the query optimizer works, including: detailed operation steps of the query optimizer, analysis of filter conditions, optimization of index items, and other information.In this article we analyze the detection of several key indicator values in the course of our operation.These indicator values

ObjectiveIn the previous article, we analyzed how the query optimizer works, including: detailed operation steps of the query optimizer, analysis of filter conditions, optimization of index items, and other information.In this article we analyze the detection of several key indicator values in the course of our operation.These indicator values are analyzed to analyze the operation of the statement and to an

performance testing process. Below I will introduce three tools that are frequently used in the performance tuning process of msyql: 1. Slow query (analyze problematic SQL statements) 2. Explain (shows how mysql uses indexes to process select statements and connect tables. Can help you select better indexes and write more optimized