elasticsearch query performance tuning

....00000120120902000001000001201209040000020000012012090600000300000120120908000004000001201209100000050000012012091400000700000220120912000006000002201209160000080000032012091800000900000420120920000010How to use this watch?After setting up a scan object, we Setstartrow (00000120120901), Setendrow (00000120120914).In this way, scan only scans the userid=1 data, and the time range is limited to the specified time period, which satisfies the filtering of the results by user and by time range. A

oracle| Data | database | Performance Oracle is a high-performance database software. The user can adjust the parameters to achieve the optimization of performance. Performance optimization is mainly divided into two parts: first, the database administrator through the adjustment of system parameters to achieve the goa

some keys, the values can be retrieved from the index tree for faster.Assume that you issue the following SELECT statement:Mysql> SELECT * from Tbl_name WHERE col1=val1 and Col2=val2; If a multi-column index exists on col1 and col2, the appropriate row can be fetched directly. If separate single-row column indexes exist on col1 and col2, the optimizer tries to find a more restrictive index by deciding which index will find fewer rows and using that index to fetch rows.When setting the Tmp_table

1m-2m size, and then set it individually on demand in each session. 4, Read_rnd_buffer_size For sorting and order by operations, it is best to set it to 1M and then set it as a session variable to a larger value in the session. (v) Slow query log A slow query log is a useful feature of MySQL. 1, Log_slow_queries MySQL parameter in the log_slow_queries parameter set it in the My.cnf file, set it to on, by d

settimeoutc) Use canvas animations appropriately, use CSS animations within 5 elements, and more than 5 using canvas animations (iOS8 can use WebGL)· High Frequency event OptimizationTouchmove, Scroll events can cause multiple renderingsA) use Requestanimationframe to monitor frame changes to make rendering at the right timeb) Increase the time interval for response changes and reduce redraw times· GPU AccelerationThe following properties in CSS (CSS3 transitions, CSS3 3D transforms, Opacity, C

.InnoDB Buffer hit RatioInnodb_buffer_read_hits = (1-innodb_buffer_pool_reads/innodb_buffer_pool_read_requests) * 100%Mysql> Show status like ' innodb_buffer_pool_read% ';25.Query Cache Hit RateQuery_cache_hits = (Qcahce_hits/(qcache_hits + qcache_inserts)) * 100%;Mysql> Show status like ' qcache% ';26.Table Cache State AmountMysql> Show status like ' open% ';27.Thread Cache Hit RateThread_cache_hits = (1-threads_created/connections) * 100%Mysql> Show

Student Information Maintenance page for basic systems , Query displays student information , but each query process is slow , so the optimization of this part .Hibernate tuning is using SSH The framework is a common problem , generally can be considered from the following aspects :I. Database design and adjustmentSecond, the main configuration parameters ( ID bu

both are created in the SGA but SQL plan directives have not yet been persisted to the Sysaux table space, and statistical feedback is used during the re-optimization period, ignoring the existence of SQL plan directives.Ø both are created but the SQL plan directives are persisted to the Sysaux table space, and the SQL plan instructions are used during the re-optimization, and statistical information feedback may also be used.Because SQL plan directives are only periodically retained, this mean

Tags: instance default help input extern data package MSDN One fixOriginal: SQL Server performance Tuning resource waiting network I/OI. OverviewThe main wait for network I/O is async_network_io, when SQL Server returns a data result set to the client, the result set is populated into the output cache (ouput cache), and the network layer begins to package the data in the output cache. Received by the client

script file Ssh_user=rootSsh_port=22 Repl_user=repluserrepl_password=123456 User=rootpassword=123456 [Server1]hostname=192.168.36.51port=3306Candidate_master=1 [Server2]hostname=192.168.36.52port=3306Candidate_master=1 [Server3]hostname=192.168.36.53port=3306Candidate_master=14.3 Start the Management Service and view the service status]# Masterha_manager--conf=/etc/mha/app1.cnf--remove_dead_master_conf--ignore_last_failover[Server4]hostname=192.168.36.54port=3306No_master=1 [Server5]hostname=19

log Log_error[=name]//Log error messages for the Enable/run/stop processQuery log general_log,general_log_file=//Record client connection and query operationsSlow query log slow_query_log,slow_query_log_file=,long_query_time=//record query operations that take a long time or do not use indexesLog Slow query:Slow-query