Oracle

--increase the primary key IDAlter TableClerk_compareAddId Number( -);--set sequence to make the ID self-incrementCreatesequence seq_id MinValue1MaxValue999999999Start with 1;--set the value of the ID to

6 ways to get the execution plan (detailed steps have been explained in the comments section at the beginning of each example):1. Explain plan for acquisition;2. Set autotrace on;3. Statistics_level=all;4. Direct access via Dbms_xplan.display_cursor

There are several ways that Oracle queries can be used, and the following is how Oracle queries the locked tables and the processes that Oracle queries connect to, and hopefully it will help you.First, view the locked tableSelect p.spid,a.serial#, c.

In Oracle, the primary function of the Sys_connect_by_path function is to differentiate all child nodes under a parent node by a character, and then connect to display in a single column. Sys_connect_by_path (field name, connection between 2 fields),

Create a test tableCREATE TABLE Base_users(UserID VARCHAR2 (16),Username VARCHAR2 (32),passwd VARCHAR2 (16)) Tablespace Cat_data;In an insert-by-line wayCreate or replace procedure Insert_data_one_by_one (n in number)AsCurrentID Number (16): =

SELECT * FROM V$sqlarea t ORDER by t.last_active_time DESCNote: Some related statements, such as executing this statement, must have DBA authority although this statement is common but useful when needed to detect a person executing a SQL statement

In Oracle, the control file is the file used when the database is mounted, the control file is lost or corrupted, and the instance crashes, where the parameter file records the location of the control file;After the instance starts to Nomount, if

I. Related content1. Master the use of OEM tools to create, modify, and delete tables.2. Master the use of SQL statements to create, modify, and delete tables.3. Master the use of SQL statements to insert, modify, and delete data.4. Understand the

1. First install the local Oracle, here I use is xe10g, the specific installation will not demonstrate, all the way fool no brains, user name password custom set to Root/root;2. Install Plsql, not accustomed to English can be installed immediately

Oracle Multi-table connection query data is divided into 3 main categories:One: Cross ConnectTable A has 3 data, table B has 4 data, after cross-linking there are 12 dataSelect Empno,ename,sal,emp.deptno,dname from EMP Cross JOIN dept;Select

Create a temporary table spaceCREATE temporary tablespace test_temptempfile ' C:\oracle\product\10.1.0\oradata\orcl\test_temp01.dbf ' SIZE 32MAUTOEXTEND ONNEXT 32M MAXSIZE 2048MEXTENT MANAGEMENT LOCAL;Create a user table spaceCREATE tablespace

Constraint is a kind of mandatory rule which is added on the table, and it is an important means to guarantee the integrality of data.When you insert data into a table, or modify data in a table, you must meet the conditions specified by the

DeclareJobno number;BeginDbms_job.submit (Jobno,' P_dosomething; ',--whatTo_date (' 20090101020000 ', ' yyyy-mm-dd hh24:mi:ss '),--next_date, can not be filledInterval = ' TRUNC (sysdate) + 1 +2/(+) '--' Interval time string '--interval, key

1. Create a table space first Create tablespace tablespace name datafile data file path (data file with DBF suffix) size data file, default storage (initial 128K next 128K maxextents Unlimi Ted Pctincrease 0) minimum extent 128K; The red part

To the company on the first day, there is nothing to do, the manager said today need to make the report, need to write a few Oracle statements, used to query all types of people under themember number and proportion of the total population.

and ((#{protocolstarttime} >= t.protocol_start_time and #{protocolstarttime} (#{protocolstarttime} = t.protocol_end_time) OR(#{protocolendtime} >= t.protocol_start_time and #{protocolendtime} )]]>This will determine your incoming start time and end

Configuration of swap on Oracle serverOn Oracle servers, setting the appropriate swap size can improve Oracle's performance, and for Oracle 11g, the physical memory on the Oracle server and the swap size to be set are as follows:If the physical

InStr (String1,string2,start_position,nth_apperance)String1: The source string to look up in this string;String2: The string to find in the String1;Start_position: The starting position of the search in String1;Nth_apperance: To find the first

Index typeBinary tree index, B-tree index (B-tree Indexes)The B-Tree index is one of the most used indexes. By default, the index created is a B-tree index. Use the B-tree structure to store the index. B-Tree bottom is leaf node, leaf node holds

One, Oracle idle time automatic release connection settings1. Locate the profile file name for the login user, for example, "DEFAULT"2.ALTER profile "DEFAULT" LIMIT Idle_time 240 (min)3, alter system set RESOURCE_LIMIT=TRUE Scope=both;Ii.