tuning oracle sql queries

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Oracle tuning (Getting Started and improving)

dramatically improve the performance of SQL statements with a few simple SQL tuning rules.--Adjusting Oracle sorting: Sorting has a significant impact on Oracle performance.--Adjust Oracle's competition: Table and index parameter settings have a significant impact on the pe

Oracle expert tuning secret)

improving the query speed. Sometimes oracle can select multiple indexes for query. tuning experts must check each index and ensure that Oracle uses the correct index. It also includes the use of Bitmap and function-based indexes.. Optimal Join Operation: some queries use nested loop join faster, some use Hash join fas

Oracle expert tuning secret

important for improving the query speed. Sometimes oracle can select multiple indexes for query. tuning experts must check each index and ensure that Oracle uses the correct index. It also includes the use of Bitmap and function-based indexes. . Optimal Join Operation: some queries use nested loop join faster, some

Oracle Expert Tuning Secrets

of Oracle tuning, and it's not surprising that you can dramatically improve the performance of SQL statements with a few simple SQL tuning rules. --Adjusting Oracle sorting: Sorting has a significant impact on

Oracle Expert Tuning Secrets (i)

surprising that you can dramatically improve the performance of SQL statements with a few simple SQL tuning rules. --Adjusting Oracle sorting: Sorting has a significant impact on Oracle performance. --Adjust Oracle's competition: Table and index parameter settings have a

SQL Server Tuning Basic Series-Performance tuning Introduction

Label:Objective About SQL Server Tuning series is a huge content system, not a word two words can be analyzed clearly, this article first in the SQL tuning in the most commonly used query plan to parse, to do a good job of the basic grasp, tamping basic skills! Then we talk about the overall statement

First Use SQL Tuning recommendation Tool--sql Tuning Advisor

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, only for the people who do not understand the

Lao Li share: Oracle performance Tuning Overview translation

: Remember that the different forms ofcontention is symptoms that can is fixed by making changes in the followingplaces: Keep in mind that the different forms of competition are symptoms that can be altered to repair, Changes in the application, or the the-the-application is used Changes to the application, or changes in how the application is used Changes in Oracle Changes to Oracle

Use of SQL tuning (SQL TUNING) parallel query hint (Hints) pq_distribute

Pq_distribute hints are often used to improve the performance of connection operations between partitioned tables in the Data Warehouse. The Pq_distribute hint allows you to determine how table data rows participating in a connection are allocated between production and consumption parallel query service processes. Pq_distribute prompt accepts three parameters: table name, outer allocation, and internal allocation.When parallel query connections are performed, we always try to avoid parallel_to_

SQL Server Tuning series advanced (How to index tuning)

", 20030212 08:30 ' 20030212 10:30); INSERT into DBO. Sessions VALUES ( ' app2 ', ' user8 ', ' For a table, ask for the maximum number of concurrent queries out of each application .... the problem is not difficult, you want to test the ability to try ... Again, it is good to review the problem again to do, you can give me the answer message. Conclusion If you have any questions, you can leave a message or private messages, and look forward to

SQL Server Tuning series advanced (How to index tuning)

ObjectiveIn the previous article we analyzed the role of statistical information in the database, and we have learned how the database uses statistics to control the distribution of the contents of tables in the database. Children's shoes are not clear and can be clicked for reference.As a tuning series of articles, the index of the database is certainly not less, so this article we began to analyze this piece of content, about the basic knowledge of

SQL Server Performance Tuning series (6)-index structure and Tuning

fragmentation level: 2. Select the correct index 2.1 main considerations Query by range Data that often needs to be sorted 2.2 secondary considerations The column length must be short. Will affect all non-clustered Indexes Non-clustered indexes also contain the key values of all clustered indexes. Data Type 3. indexing principles Priority of all SQL syntaxes Give priority to creating indexes that can be used by multiple query syntaxes. Optima

Common Oracle Database classic queries and oracle database queries

Common Oracle Database classic queries and oracle database queries This document collects common database queries and requires the database administrator privilege: 1. query temporary tablespace usage SELECT TABLESPACE_NAME, TABLESPACE_SIZE / 1024 / 1024 TABLESPACE_SIZE

ORACLE Performance Tuning (i) Diagnostics and tuning tools

First, diagnostic tools 1. Warning Log file Warning log files contain system information and error logs that contain important errors (such as: ORA-600) and block checksum error messages (ora-1578,ora-1498). Monitor database operations such as CREATE DATABASE, STARTUP, SHUTDOWN, ARCHIVE log, and RECOVER, and record Non-default initialization parameter values. When Log_checkpionts_to_alert is set to true, the warning log file also records the start and end times of checkpoints, incomplete checkpo

Learn more about SQL Tuning Advisor (reprint)

Tags: Star ref note + + limit base min ant into1, Preface: SQL Tuning has been the DBA of the more laborious technology, and many DBAs if not engaged in the development of the work, then tuning is a headache work, even if the SQL tuning is a strong master, in the process of

Oracle Expert Tuning Secrets

surprising that you can dramatically improve the performance of SQL statements with a few simple SQL tuning rules. --Adjusting Oracle sorting: Sorting has a significant impact on Oracle performance. --Adjust Oracle's competition: Table and index parameter settings have a

SQL Plan Management (SPM) for SQL optimization (SQL TUNING) features in oracle11g

either: Auto-capture:automatically captured Manual-load:manually evolved Manual-sqltune:automatically evolved by SQL Tuning Advisor Auto-sqltune:automatically evolved by Automatic SQL Tuning ENABLED Indicates the SQL

Oracle Expert Tuning Secrets (II.)

table search, their cost and the reading of the block and possible parallel execution, and compare the two. In some cases, the elimination of unnecessary full table searches can be achieved by forcing the use of a single index, with the addition of an indexed hint in the SQL statement. . When a full table search is one of the fastest access methods, put the full table search of the small table to defend the school  饔 throw  to the  of the "Omega"

SQL Performance Tuning daily accumulation "turn"

DEPT where LOC = ' Melb ')Back to Top (16) SQL statement identifying ' inefficient execution 'Although there are many graphical tools for SQL optimization, it is always a good idea to write your own SQL tools to solve the problem:SELECT executions, disk_reads, Buffer_gets,ROUND ((buffer_gets-disk_reads)/buffer_gets,2) Hit_radio,ROUND (disk_reads/executions,2) Re

SQL Performance Tuning daily accumulation "turn"

table) where EMPNO > 0 and DEPTNO in (SELECT DEPTNO from DEPT where LOC = ' Melb ')Back to Top (16) SQL statement identifying ' inefficient execution 'Although there are many graphical tools for SQL optimization, it is always a good idea to write your own SQL tools to solve the problem: SELECT executions, disk_reads, Buffer_gets, ROUND ((buffer_gets-disk_reads)/

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