Database Administrator

Share the Android sqlite export and data operation experience. Sqliteadmin.zip is a sqlite visual management software. I uploaded a download channel in csdn. 1. Set the environment variable: Add X: \ android-sdk-windows \ platform-tools (based on

Q: Does Oracle differentiate ROWID from ROWNUM? If they have differences, what are their differences? A: Just as your address uniquely identifies your location, an oracle rowid uniquely identifies the physical address of a piece of data.Rowid

In Oracle, sequence is the so-called serial number, which is automatically increased every time it is obtained. It is generally used in places where the sequence numbers need to be sorted.1. Create SequenceFirst, you must have the create sequence or

L relationship between extent and segment The number of Oracle blocks for each extent is determined by the extent size/DB_BLOCK_SIZE. The extent size is determined by the initial, next, determine parameters such as pctincrease. The number of extents

After logging on to https: // localhost: 1158/em, you can see that the database instances are all closed and cannot be started. Find a solution on the Internet and write it down. Enter dos (1) view the dbconsole status: emctl status

1. Unable to initialize the database file After we installed Oracle, we couldn't wait to start it. come on Use an oracle user to log on to the system $ Dbstart $ ORACLE_HOME The following error is returned: Cannot read $

In linux, the upgrade from 10.2.0.1 to 10.2.0.4 is performed. The main process is recorded below: 1. Download patches Patch: p6810189_10204_Linux-x86.zip can go to Oracle official website download 2. Preparations before Upgrade and Installation 1.

Lecture 01st: Chapter 01 -- Oracle ‑tural Components.swf-----------------Instance and database Oracle Server: Includes instance + database An instance corresponds to a database Multiple instances can correspond to one database: Multiple-to-one

We gradually have a better understanding and knowledge of Oracle. Over time, we will explain the knowledge of SQL subqueries in this course, I hope the content in the course will help you! Subquery: When a query result is a condition of another

Question: Why is transaction introduced? 1>. Data Integrity 2>. Data Security 3>. Make full use of system resources to improve the system's concurrent processing capability 1. Transaction Features Transactions have four features: Atomiocity,

Use the following code in java to query the clob column of db2 (Conn. createStatement (ResultSet. TYPE_SCROLL_INSENSITIVE, resultset.concur_read_only1_cmd.exe cuteQuery (SQL)The following error is reported: DB2 SQL error: SQLCODE:-270, SQLSTATE: 42

1. Stored Procedure for inserting a large amount of test dataCREATE OR REPLACE PROCEDURE INSERTAMOUNTTEST(ST_NUM in number,ED_NUM IN NUMBER)ISBEGINDeclareI number;BeginFOR I IN ST_NUM..ED_NUM LOOPInsert into tb values (I, I, '3', '3', '3', 100, '0 ')

In general, MySQL does not use the Chinese character set by default during installation. If you want to use Chinese character data, there are two ways. One is to specify the use of the Chinese character set during installation, if MySQL has been

An Oracle database is composed of only some files. An Oracle instance is an Oracle Server process set with its own system global zone and related database files. The newly installed Oracle database management system has a pre-installed database

From the first commercial version of Oracle to the present, oracle's default database has all the users whose names are scott and whose passwords are tiger. What exactly does scott come from? How can we keep it rare in our oracle version. This is

Create table t (pk number primary key, name varchar2 (20 )); Create sequence t_seq;Create trigger t_trigger before insert on t for each rowBeginSelect seq. nextval into: new. pk from dual;End;/ Test: select * from t;Unselected row SQL> insert

The business problem can be roughly described as follows: A parent table and a sub-table, the query result is to find the records in the sub-table that do not use the parent table id. In this case, it is estimated that many systems will be involved.

I. Features of SQL Loader Oracle has many tools for data migration, backup, and recovery. However, each tool has its own characteristics.For example, exp and imp can be used to export and export data in the database, which is a good tool for

(1) copy the table structure and copy the data in the table at the same time. Create table 1 as select * from table 2; (2) copy the table structure. Create table 1 as select * from table 2 where 1 <> 1; Of course, the where clause can also be: 1

1. Check the current data file. Seven data files are displayed on drive F.SQL> select name, file # from v $ datafile; NAME---------------------------FILE #----F: OraclePRODUCT10.2.0ORADATASGECSYSTEM01. DBF1 F: ORACLEPRODUCT10.2.0ORADATASGECUNDOTBS01.