plan digitizer

1. What is an execution plan) Execution Plan: the execution process or access path of a query statement in ORACLE.Ii. How to view the execution plan1: Press F5 under PL/SQL to view the execution plan. Third-party tools such as toad.Many people think that the PL/SQL Execution Plan can only see basic information such as

restriction condition of the application query. Therefore, if a large table has a restriction condition in the WHERE condition (such as the equivalence restriction ), this large table is also suitable as the driving table, so not only a small table can be used as the driving table. The correct statement should be based on the restrictions of the application query, returns the table with fewer row sources as the driving table. In the Execution Plan, i

Brief introduction: This article introduces comprehensively in detail OracleImplement the relevant concepts of the plan, access methods of accessing data, connections between tables, and so on. and a summary and overview, easy to understand and memory! +++ Directory---one. Concepts related to the concept of rowid recursive SQLConcept predicate (predicate) driving table (Driver table) probed table (probed table) combined index (concatenated Index) Opti

Label:This document is based on the relevant data collated, summarized, mainly on the Oracle database, to obtain the most authoritative and correct method of SQL statement execution plan, and also explained in detail the meaning of the options available in each method and how to use, so as to facilitate everyone and their daily work to consult the use of Because I did not find this blog support attachment upload function, need to PDF file format frien

As we all know, the postgraduate entrance exam is a systematic and massive project that needs to be fully grasped. In this year or half a year, how do I organize my own review plan? How can I effectively manage my review time? How can we greatly improve learning efficiency through scientific review planning and time management? These are undoubtedly the most important questions for the majority of candidates. In this section, we will give you a long-a

Project Development Plan (GB856T--88)1 Introduction 1.1 Writing Purpose A project development plan is a preliminary plan for determining the project to be developed. You need to have a rough understanding of the conditions required during the entire project development process. The intended readers of the Project Development

Label: style blog HTTP color Io OS AR SQL Server uses many technologies to optimize resource consumption: Syntax-based Query Optimization; Useless plan matching to avoid in-depth Optimization of simple queries; Index and connection policy based on the current distribution statistics; Multi-Stage query optimization to control the optimization overhead; Execution Plan buffering to avoid re-generating th

WIN8 Select a power plan in the following ways: Method One: 1, select the power Plan through the power icon, left-click the lower right corner battery icon. 2, click on the required power plan. Method Two: Turn on power Options Select Power Plan: 1, open the "Control Panel." 2, click "System and Secu

Following Sohu, the Nasdaq:bidu board also announced approval of a stock repurchase plan to buy back $200 million trillion of US depository shares before the end of 2009. According to incomplete statistics, since the second half of this year, the newly approved large repurchase scheme of the network companies have 7, and based on the previous plan to carry out frequent repurchase of the "Chinese concept st

Project Directory Report Directory Summary of the first part (summary of the whole plan) (Text is within 2-3 pages)I. Brief description of the project (purpose, meaning, content, mode of operation)Two. Overview of market ObjectivesThree. Project advantages and characteristics of the introductionFour. A brief analysis of the source of profitFive. Investment and BudgetSix. Financing programmes (financing and investment modalities)Seven. Financial analys

1. Right-click "Start" in the lower-left corner in desktop mode.2. Select "Control Panel".3. Select "System and Security".4. Select "Power Options".5. If the active plan is a plan to be deleted, you need to change a different plan to become the activity plan (change to ldquo; save rdquo;). 6. On the right side of th

Method One, 1, directly in the lower right corner of the Win7 system, select the power Plan, and then left click on the "Battery icon"; 2, then a Power Plan window will pop up. On the Power Plan window that pops up, select the power Plan and choose "High performance" or "balanced"; Method Two, 1, access on the in

Numeric,Cardinality numeric,Bytes Numeric,Other_tag varchar2 (255),Partition_start varchar2 (255),Partition_stop varchar2 (255),partition_id Numeric,Other Long,Distribution VARCHAR2 (30));The 3,sql/plus window runs the following commandSet time on; (Description: Open time display) (optional)Set autotrace on; (Description: Turn on automatic analysis statistics and display the results of the SQL statement)Set Autotrace traceonly; (Description: Turn on automatic analysis statistics, do not display

The previous two chapters took a lot of space to introduce the sparksql of the operation process, many readers still feel that the concept is very abstract, such as unresolved Logicplan, Logicplan, Physicalplan is what looks like, no impression, only know the noun , it feels very misty. This chapter focuses on a tool hive/console to deepen the reader's understanding of Sparksql's operational plan. The 1:hive/console installation Sparksql provides a Sp

Label: The following reasons may cause the MySQL optimizer to choose the wrong execution plan: A: The statistics are inaccurate,MySQL relies on the statistics provided by the storage engine to evaluate the costs, but some of the information provided by the storage engine is accurate, and some of the engines may have a large bias, such as:InnoDB because of its MVCC architecture, Does not maintain accurate statistics on the number of rows in a data tabl

Tags: MySQL optimized sql explainMySQL Explain execution plan detailed 1), the ID column of the larger the first to execute, if the number is the same size, then proceed from the top down, the ID is listed as NULL for the table is this is a result set, do not need to use it to query. 2), Select_type columns are common:A:simple: Represents a simple select query that does not require a union operation or does not contain subqueries. When there is a conn

Objective:According to the plan, this article began to tell the other operator concatenation (concatenation), the reader can be based on the word (both English and Chinese) first fantasy is what it is. In fact, it is very intuitive, is to connect things together, then let us look at the bottom of what even? How do you even? When do you even?Brief introduction:The concatenation operator is both a physical operator and a logical operator, called "concat

To obtain the execution plan in the cache library, you can directly query the dynamic performance view v $ SQL _plan and v $ SQL _plan_statistics_all, but the more convenient method is SQL _id and sub- To obtain the execution plan in the cache library, you can directly query the dynamic performance view v $ SQL _plan and v $ SQL _plan_statistics_all, but the more convenient method is SQL _id and sub- 1

Starting from Oracle11g, it provides a new method of fixed Execution Plan, namely SQLplanbaseline, the Chinese name SQL Execution Plan baseline (baseline for short), which can be considered as OUTL Starting from Oracle 11g, it provides a new method for fixed execution plans, namely, SQL plan baseline, a Chinese-name SQL Execution

This article originates from TTT BLOG, original address: http://blog.chinaunix.net/u3/107265/showart_2192657.html Brief Introduction: This article comprehensively introduces the related concepts of Oracle execution plan, accessing data access methods , the connection between tables, and so on. and a summary and overview, easy to understand and memory! +++ Directory---one. Related concept ROWID concepts recursive SQL concept predicate (predicate) driv