Oracle

1) hit rate of the Library cacheFormula: Library Cache hit Ratio=sum (pinhits)/sum (PINS)SELECT SUM (pinhits)/sum (PINS) from V$librarycache;The hit rate cannot be less than 99%, otherwise you need to consider whether it is affected by the shared

In Oracle, you can create composite indexes, which are indexes that contain two or more columns at one time. In terms of the use of composite indexes, Oracle has the following features:1. When a rule-based optimizer (RBO) is used, the index is used

For a detailed analysis of this case, please refer to the article "Oracle database cursor case explanation and source code"http://blog.csdn.net/sinat_26342009/article/details/45199827Case Requirements:Use cursors to transform data from two

Table structure Stored Procedures CREATE OR REPLACE PROCEDURE TEST3 (TID in Integer,o out sys_refcursor) as BEGIN IF (tid>0) then OPEN O for SELECT * FROM Xhsck. T_administrative_level T WHERE t.administrative_level_id =

Read Oracle data in ScalaAfter adding the Oralce jar packagePackage Cn.bigdata.scala.oracleimport java.sql. {DriverManager, Connection, Resultset}object connectoracle { val user= "Youname" val password = "Youpwd" Val conn_str = "Jdbc:oracle:

---Check execution Plan----[Email protected]Select Plan_table_output from table (Dbms_xplan.display_awr (' &sql_id ', Null,null, ' Advanced +peeked_binds '));---all [email protected]SELECT

Insert First/all makes it possible for INSERT statements to insert multiple tables at the same time, and to determine which table or tables each record is inserted into according to the criteria.Insert First : for each row of data, insert only the

In project development, there is a need to extract the date of birth from the identity card information:1. For 18-bit IDs, because there are multiple tables, use their associations, as shown in the following example:Update pfapperosoninformation  p

Sdoug IntroductionSdoug member programs (SDOUG membership program), also known as the Oracle Shandong User group, referred to as Sdoug, are co-sponsored by Geu Yunjie, Yang Yunlong, and Nobuyoshi, and are designed to recognize and recognize those

How Oracle can update newly inserted data with trigger implementationCreate or Replace Trigger Tr_nameBefore insertOn tableFor each rowBegin: New. A field = ' newly value ';EndModify a field of a table of data AA (this field is specified), after

--Create a remote data connectionCreate DATABASE link DB_MZDB11 connect to ytmztwo identified by YTMZTWO909 using ' MZDB11 ';--Create a local directoryCreate directory Db_mz as ' C: ';--authorized users to read and writeGrant Read,write on directory

Win7 Installing the Oracle 10g (Vista) methodFirst download, 10203_vista_w2k8_x86_production_db (note to the next, otherwise there is no Refhost.xml

DB version: Oracle database 11g Enterprise Edition release 11.2.0.2.0- 64bitORACLE11G adds new features for virtual columns, as described below:1> can only create virtual columns on the heap organization table (normal table), cannot create virtual

One, the Oracle installation process is slightlyII. SYS user and system user(1) SYS user is superuser, has the highest privilege, has SYSDBA role, has CREATE DATABASE permissionThe default password is Change_oninstall(2) The system user is the

1.GOTO, mainly used for jumping, but will disrupt our program logic, generally do not use, it can realize the function of Return,exit2.RETURN, return to program end, end program3.EXIT, mainly used to exit the current loop, equivalent to break in

--Create a result temp table at the transaction levelCreateGlobalTemporary TableTmp_yshy (C1varchar2( -), C2varchar2( -)) on Commit Deleterows;--Create a temporary table that stores SQL statements at the transaction levelCreateGlobalTemporary

The difference between an Oracle constraint implicitly creating an index and a post-index constraintTwo cases:1. For an index created implicitly when creating a constraint, when doing a delete operation: 9i~11g will delete the index2. For creating

Http: // localhost: 8080/displays the description of Oracle, localhostoracle Enter http: // localhost: 8080 to display the tomcat homepage. After checking, environment variables in jdk, tomcat, and oracle are set correctly. However, after

12CORA-27106 error handling process Two days ago, the customer Exadata 12c Environment reported an error due to memory allocation. The following is the processing process. An error is reported when the node is restarted, but other nodes are started

Dumpleafblock of Oracle Index Dump the Oracle index leaf block F: \ oracle \ product \ 10.2.0 \ db_1 \ BIN> sqlplus/as sysdbaSQL * Plus: Release 10.2.0.4.0-Production on Thu Apr 9 06:28:17 2015 Copyright (c) 1982,200 7, Oracle. all Rights Reserved.