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DURATION from INFORMATION_SCHEMA. PROFILING WHERE query_id =28 ORDER by SEQ;+----------+| DURATION |+----------+| 0.000039 |+----------+1 row in Set (0.00 sec)Mysql>From the above example we can clearly see the difference between the 2 executions of the Count statement, show profile for QUERY 27 shows the first count of the execution process, including Opening tables, Table Lock and other operations. While show profile for QUERY 28 shows the execution of the second count statistic, the second c
1. Find SQL Server Profiler and log on Location: Click start -- program -- Microsoft SQL Server -- performance tool -- SQL Server Profiler Or find the location after Logon: 2. Then, enter the following interface: Enter relevant information and click Connect to enter the n
SQL Server Profiler can detect statements executed on the data, especially if some projects do not directly use SQL statements, directly using the ORM framework of the system to process the database project, when debugging SQL statements, it is very helpful.Previously wrote
in 10g, Oracle launched its own SQL optimization aids : SQL Optimizer (SQL Tuning Advisor :STA) , it is the new Dbms_sqltune package. Use the STA to make sure that the optimizer is in CBO mode. but I think that using this tool is only suitable for people who don't understa
Tags: performance testinguse of SQL Server ProfilerOpen the System main Menu--sqlserver several---performance tools--->>sql server Profiler; you got it? Brother Wait for you, give you a picture of open him, let you see.Then the file--new trace--Displays the Tracking Properties windowFirst of all, the select% is a screening and monitoring textdata. That percent is
How to use Oracle's Dbms_sqltune package to execute SQL Tuning Advisor for SQL self-tuning1 ". Here is a simple example to illustrate the use of Dbms_sqltuneStart by running a SQL that you want to tune, and then get the SqlidSql>
Tags: Table performance event gem database file user Condition program1. Open SQL Server Management Studio, select Tools->sql Server Profiler, or direct from path: Start/program/microsoft SQL Server R2/performance Tools/sql Server Profil
How to use Oracle's Dbms_sqltune package to execute SQL Tuning Advisor for SQL self-tuning1 ". Here is a simple example to illustrate the use of Dbms_sqltuneStart by running a SQL that you want to tune, and then get the SqlidSql>
Tags: style c tar ext a intHow to use Oracle's Dbms_sqltune package to run SQL Tuning Advisor for SQL automatic tuning1 ". Here's a simple example of how dbms_sqltune is used.First execute the next SQL that you want to tune, and then get the SqlidSql> SELECT * from V$sqltext
inner table size is multiplied by the number of parallel service processes greater than the physical size.3) Pq_distribute (Tab_name, none,broadcast): This combination forces all data rows within the table to be broadcast to each consuming parallel query service process, while the outer data rows are randomly partitioned. This hint is recommended when the inner table is more than the outside hour. An important principle is that the none/broadcase hint is recommended when the inner table size is
in 10g, Oracle launched its own SQL optimization aids : SQL Optimizer (SQL Tuning Advisor :STA) , it is the new Dbms_sqltune package. Use the STA to make sure that the optimizer is in CBO mode. but I think the use of such tools,
Oracle 10 Gb later optimizer supports two modes: Normal Mode and tuning mode. In most cases, the optimizer is in normal mode. The CBO-based Normal Mode only takes into account a small part of the Execution Plan set to select which execution plan, because it needs to be as short as possible, it is usually several seconds or milliseconds to parse the current SQL statement and generate an execution plan. There
Original: SQL Server Tuning Series play turn three (use index hint (Hint) to boot statement maximum optimization run)ObjectiveThis article continues to play the content of the module, about the location of the index in SQL Server No need to say, this article will analyze how to use
threads.Of course, here are a few thread operations can set their own, the maximum recommended for the current system configuration of the logical core number, of course, the large set can be just useless.Second , index Hint hints (index Hint)The so-called index hint hint is to force the query optimizer to perform a scan of a query statement or use a specified index.In this way, we often use in the
How to use STA (SQL tuning advisor), tuningadvisor1. manually generate SQL tuning advisor1. SQL text format:DECLAREMy_task_name VARCHAR2 (30 );My_sqltext CLOB;BEGINMy_sqltext: = 'select * FROM DBA_SEGMENTS where owner = ''clic' AN
threads.Of course, here are a few thread operations can set their own, the maximum recommended for the current system configuration of the logical core number, of course, the large set can be just useless.Second , index Hint hints (index Hint)The so-called index hint hint is to force the query optimizer to perform a scan of a query statement or use a specified index.In this way, we often use in the
Before oracle10g, it would be a hassle to optimize an SQL statement, but the SQL Tuning Advisor tool, introduced in oracle10g this release, would significantly reduce the workload of SQL tuning, but to use
Use of the 1.explain plansql> explain plan for delete from T_jingyu; Explained.sql> select * FROM table (dbms_xplan.display); Plan_table_ OUTPUT------------------------------------------------------------------------------------------------------------------- -------------------------Plan Hash value:1368587462------------------------------------------------------------- ----------| Id | Operation | Name | Rows | Cost (%CPU) | Time |-----------------
First, manually generated SQL Tuning Advisor1. SQL Text Format:DECLAREMy_task_name VARCHAR2 (30);My_sqltext CLOB;BEGINMy_sqltext: = ' SELECT * from dba_segments WHERE owner= ' CLIC ' and segment_type= ' TABLE ';My_task_name: = Dbms_sqltune. Create_tuning_task (Sql_text = My_sqltext,Scope = ' comprehensive ',Time_limit = 60,Task_name = ' Test_sql_tuning_task1 ',De
SELECT TOP 1000O.name as table name, I.name as index name, i.index_id as index ID, dm_ius.user_seeks as Search times, Dm_ius.user_scans as Scan count, dm_ius.user_lookups as lookup times, dm_ius.user_updates as update number, p.tablerows as table row count, ' DROP INDEX ' + QUOTENAME (i.name)+ ' on ' + QUOTENAME (s.name) + '. ' + QUOTENAME (object_name (Dm_ius. object_id)) as ' DELETE statement 'From Sys.dm_db_index_usage_stats Dm_iusINNER JOIN sys.indexes i on i.index_id = dm_ius.index_id and D
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