Oracle

--View disk statements that consume the most disk read and write ratesSELECT *From (select v.sql_id,V.child_number,V.sql_text,V.elapsed_time,V.cpu_time,V.disk_reads,Rank () Over (order by v.disk_reads Desc) Elapsed_rankFrom V$sql v) awhere

We need to delete the child nodes when we delete the parent node, and the child nodes are also deleted, so we need to loop the function until there are no child nodes.Print out all child nodes under a node as followsTable structure is a traditional

Row Share (RS)This lock, also called a subshare table lock (SS), indicates then the transaction holding the lock on the table have locked Rows in the table and intends to update them. A row share lock is the least restrictive mode of table lock,

The column command can be used to format the columns, including the column headings and column data, and the syntax for the command is as follows:Col[umn] [{column | expr} [option ...]]Column name specifiedOptions specifies one or more choices for

Records of deposits and generaI. Steps to install a databaseSecond, download the databaseAddress: http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.htmlThird, view system resources and environmentInstall the required

with the pagesize command, you can set the size of each page to control the amount of data displayed on each page. Syntax format of the pagesize commandAs follows:Set pagesize nWhere the parameter n represents a positive integer for each page size,

1.how to find invalid status stored procedure and recompile them?SELECT object_name, status from user_objects WHERE object_type = ' PROCEDURE ';Alter procedure Schme.procedurename Compile;Lack of practice is not a complete study of learning,

Table 5-4 Oracle Database Background Processes Process Name Description Database writer (DBWN) The database writer writes modified blocks from the Database buffer cache to the data files. Oracle

Triggers in OracleA trigger is a special amount stored procedure that is automatically triggered by an Oracle system when a certain database time occurs. Triggers are often used to enforce database integrity constraints and business rules, and for

SQL Indexing technology sharing - content Planning ORACLE Execution Technology 1) What is the implementation plan? 2) How does the execution plan analyze the best path? 3) use PL/SQL to demonstrate how to view the execution plan? 4)

Use the spool command to copy the results of the output from the Sql*plus to a specified file, or the results of the querySend to the printer and use the spool off command directly.The syntax of the spool command is as follows:Spool [file_name

1. Connect to the database# su-oracle$ conn/as SYSDBA2. CREATE TABLE Spacesql> Create tablespace doiido datafile '/main/oracle/oradata/doiido.dbf ' size 1024M autoextend on next 1024M maxsize 10 240M extent management Local;3. Create userSql> create

Oracle defines the package and the use of stored procedures, oraclepackage Use the dept table under the scott account; Select * from dept order by deptno; 10 ACCOUNTING NEW YORK 20 RESEARCH DALLAS 30 SALES CHICAGO 40 OPERATIONS BOSTON To facilitate

Oracle edit command Use the edit command to copy the content in the SQL * plus buffer to an afiedt. buf file, and then start the default editor in the operating system to open this file, and the file content can be edited. In Windows, the default

How to adjust the performance through the internal mechanism of the Oracle Buffer In this advanced Oracle tutorial, I will discuss the internal mechanism of Oracle Data Buffer-Oracle uses this memory to prevent unnecessary data blocks from being

Calling the Oracle stored procedure in javaCalling the Oracle stored procedure in java This article describes how to call the stored procedure of Oracle through java. 1. Write the Stored Procedure Create or replace procedure sp_pro3 (sp_name VARCHAR2

Oracle start commandThe start command can read the content in the file to the buffer, and then run the content in SQL * PLUS. the syntax of the start command is as follows:Start {url | file_name}The url is used to specify a url address, such as http:

Oracle get commandOracle can use the get command to read file content to the buffer zone,The get command syntax is as follows:Get [file] file_name {list | nolist]File_name indicates an external file, which is included in the SQL * plus buffer.List

Oracle user unlock Connect first SQL * Plus: Release 12.1.0.2.0 Production on Thursday February 12 15:40:422015 Copyright (c) 1982,201 4, Oracle. All rights reserved. Enter the User name: system Enter the password: Last Successful Logon Time:

Oraclesql tuning set **************************************** * ******************** 1. create an optimization set object ************************************ * ********************** --- authorize grant administer any SQL TUNING SET to scott; ---