Oracle

When you update the same row of records concurrently, the post-update connection needs to wait for the first update to commit or roll back. 3 Graphs to help understand: 1 , New command window, update id=1 line, there is echo can continue to execute

First, set feedback onBy default, Oracle gives a feedback when a SQL is issued.For example, execute the following CREATE TABLE statement:CREATE TABLE t_test_lll (ID varchar2 (10));The Command Guild returns: Table created.For example, when performing

If only some of the data is deleted by mistake or a piece of data can be1. Select * from the error deletion indicates that as of timestamp to_date (' Recovery date seconds ', ' Recovery time format ') where query condition ;Example: SELECT * from

Environment Win7 (+) + Python 2.7.5 +cx_oracle-5.1.3-11g.win-amd64-py2.71. dll is not a valid Win32 applicationImport cx_oracle after running an error "DLL is not a valid Win32 application"After finding out that Oracle's client is using a 32-bit, 64-

----Create a new service, Pmon will automatically (dynamically) register to Tnslsnr after creation, the service created is not permanent and will be lost after the database restarts.To persist requires the use of ALTER system set service_names= ' xx

First, create a table:CREATE TABLE test ( ID number (+) NOT null primary key, name VARCHAR2 (32));Then, customize a sequence (sequence)CREATE SEQUENCE test_sequenceincrement by 1--each time you add a few start with 1--counting from 1 nomaxvalue--

Alter ANY cluster permission to modify any clusterAlter any index to modify permissions on arbitrary indexesAlter any role to modify permissions for arbitrary rolesAlter ANY SEQUENCE permission to modify any sequenceAlter any snapshot permissions to

Oracle data import Specifies table space1. Open the tool Oracle SQL Plus log in to the SYS user as DBASqlplus/nologconn [email protected] as SYSDBA2. Create a user and specify a tablespaceUse the Client tool or the Web Management console to create

CREATE OR REPLACE TRIGGER Xtgl_logon_triggerAfter logon on DATABASEBEGIN INSERT into Xtgl_logon (Sessionid,ipaddress,machinename,programname,logondate,logonid) VALUES (Sys_context (' Userenv ', ' SESSIONID '), Ora_client_ip_address,sys_context

1. Describe the difference between a procedure, function and anonymous PL/SQL block. Candidate should mention use of DECLARE statement, a function must return a value while a procedure doesn ' t has To.2. What's a mutating table error and how can I

1. How would determine the time zone under which a database is operating? SELECT Dbtimezone from DUAL; 2. Explain the use of setting global_names equal to TRUE. It ensure the use of consistent naming conventions

1. How can variables is passed to a SQL routineBy use of the & symbol. For passing in variables the numbers 1-8 can is used (&1, &2,..., &8) to pass the values after the command into The SQLPLUS session. To being prompted for a specific variable,

View Oracle several ways to execute a planFirst, through the PL/SQL Dev tool1. Directly file->new->explain plan window, execute SQL in the window to view the planned results. Where the cost represents the CPU consumption, the unit is n%,cardinality

The first thing to look at is whether your Oracle optimizer is using RBO or CBO,(1) If Rbo is used, it will be carried out in the order of the rules.(2) If you are using a CBO, you can modify it using the Hint method.Syntax:SELECT/*+ Index (table

CLOB type, but for this type of processing is still more troublesome, varchar2 length of 4000bytes, if VARCHAR2 can meet the needs of the landlord, we recommend the use of VARCHAR2, the following provides the way to read the CLOB type in Java, I am

Backup Requirements and Rman backupOracle database Backup related questions and answers:1) What is the state of the database at the time of backup?The database is in the open state when you back up so that the database works correctly.2) where is

SQL sorts strings and SQL strings Assume that the string is composed of 'A', 'B', 'C', and 'D' and the length is 7. Set the REPLICATE function (, ) to create a string of n replicas of , REPLACE (, , ), implemented as follows: 1 BEGIN 2 DECLARE

Brief Introduction to the environment variable ORACLE_SID[Oracle10g @ lixora ~] $ Export ORACLE_SID = 12323[Oracle10g @ lixora ~] $! SQLSqlplus/as sysdbaSQL * Plus: Release 10.2.0.1.0-Production on Thu Nov 6 02:24:04 2014Copyright (c) 1982,200 5,

Oracle Character Set modification (ORA-29275) Today, a friend of the database ORA-29275 part of the multi-byte characters, the corresponding field can only use to_char to query the normal, it is a character set problem. You have modified the

Several items before deleting oracle archive logs To delete archived logs, you must confirm the following in advance:1. Whether it is a dg Environment: if it is a dg Environment, check whether the archived logs have been applied to the slave