elasticsearch query performance tuning

physical reads are likely to require more server resources than logical reads. Because SQL Server does not perform a query, it is not possible to reduce the number of physical reads by performance tuning. Reducing physical reads is a complex and important task, and it involves tuning the

Compare SQL query Performance statements--First Use set STATISTICS io and set STATISTICS time to see if performance tuning is valid. --set STATISTICS time on--SET STATISTICS time onBefore starting our example, run the following two commands ( do not execute on the server you are using ).These two commands will clear th

Test Data Volume: 10407608Num docs:10407608In the project one of the most commonly used queries, query a certain period of time data, SQL query to obtain data, 30s or soSELECT * from ' tf_hotspotdata_copy_test ' WHERE collecttime BETWEEN ' 2014-12-06 00:00:00 ' and ' 2014-12-10 21:31:55 ';After indexing the collecttime, the same query, 2s, is much faster.SOLR Ind

shown in the below illust Ration. The tip, http://www.mssqltips.com/sqlservertip/2876/ Improve-sql-server-analysis-services-performance-with-the-usage-based-optimization-wizard/, written by Daniel Calbimonte provides a superb review of this topic. We could record every query, but this method has the potential to generate a very large table with many queries (which cou LD impact

Here we will mainly introduce you to DB2 Performance Tuning: Design and configure the Use constraints of your database solution to improve query optimization, we all know that many database design and configuration options can affect query performance. For more suggestions o

For some current releases, three dynamic performance views are available for DBAs (Database Administrator, Database Administrator) and developers, namely V $ SQL, V $ SQLAREA, and V $ SQLTEXT.These views can be used to collect statistics about SQL command execution. In Oracle 10g and Release 2, the fourth dynamic performance view, V $ SQLSTATS, is added to facilitate access to such data.Unlike the static da

Tags: tuning filter des log execution plan. com nbsp Select informationRecently in the tuning of a customer to find a very interesting phenomenon, for a complex query (involving 12 tables) to establish the necessary indexes, the statement used by the IO dropped sharply, but the execution time does not drop the reverse rise, from the original 8 seconds to 20 secon

highly efficient, but because of its limited statistics, the optimizer's work process is more likely to deviate. For complex multiple table joins, on the one hand because of its optimizer limited, and also in the Join this aspect of the effort is not enough, so performance from Oracle and other relational database predecessors still have a certain distance. However, if it is a simple single table query, th

%Sample server query Cache Fragmentation rate = 20.46%, query cache utilization = 62.26%, query cache Hit ratio = 1.94%, bad hit, probably write more frequently, and possibly some fragmentsQuote a word from a predecessorIf the Qcache_lowmem_prunes value is larger, it indicates that the query buffer size setting is too

query 7 to use the execution plan by clicking on "Force execution plan". Come on, we've solved the problem! Now when you execute the stored procedure (with 80000 input parameter values), you can see the clustered index scan in the execution plan, and the execution plan generates only 419 logical reads--quite simply, isn't it? Definitely not!!!! Microsoft has told us only "new ways" to fix SQL Server performa