Oracle

Http://qdlover.yeah.net An Oracle + PhP query example I didn't need PHP anymore, but a lot of friends asked me, so I made an example. For details about the function, please refer to the manual. In fact, Oracle functions are similar to others, but

The ORACLE tutorial is: Installing Oracle 8i on P4. Method 1:1. Copy the ORACLE software to the hard disk.2. copy the hard drive directory file stageComponentsoracle. swd. jre1.1.7.30/1The file DataFilesExpandedjrewin32binsymcjit. dll is

1. query table space usage:Sqlplus system/manager @ topprodCopy codeThe Code is as follows:SQL> @ q_tbsFREE 2. How to query temp:Sqlplus system/manager @ topprodCopy codeThe Code is as follows:SQL> SELECTD. tablespace_name, D. status

A cluster is actually a group of tables, which are composed of multiple tables that share the same data block. Combining tables that are frequently used together into clusters can improve processing efficiency; a table in a cluster is called a

1. Optimizing applications and business logic is the most important thing.2. flexible application of the database design phase paradigm and the anti-paradigm. Generally, the internal design should be physical and non-standard for frequently accessed

1. Start ---- program ----- oracle ------ configuration and porting tool ----- Net Manager ---- local ---- service name --- ora11 (this is my dedicated server) change the host name on the Right To 192.168.1.102 2. Start ---- program ----- oracle ---

To query the total number of fields in a table in Oracle, use an SQL statement orCopy codeThe Code is as follows:Select count (column_name) from user_tab_columns where table_name = 't_ B _AUDITOR'The number of fields in the specified table can be

DB2Copy codeThe Code is as follows:Create table T1(Id integer not null generated always as identity (start with 1 increment by 1 MINVALUE 1 no maxvalue no cycle no cache order ),...);Oracle (you need to create a SEQUENCE and a TRIGGER ):Copy codeThe

Using a cursor, I think this method is absolutely safe.-- First, set a cursor to store the required data in the cursor:Copy codeThe Code is as follows:DeclareCURSOR D_CURSOR_CUS_INFO ISSelect t3.id _ as id _,T3.owe _ money _ as owe_money _,A.

The following is an example of a trigger:Copy codeThe Code is as follows:Create or replace trigger logon_ip_controlAfter logon databaseDeclareIp STRING (30 );User STRING (30 );BeginSELECT SYS_CONTEXT ('userenv', 'session _ user') into USER from dual;

1. Estimate the execution Plan-Explain PlanThe Explain plan uses an SQL statement as the input to obtain the execution plan of the SQL statement and store the execution plan output to the schedule.First,Add the explain plan for statement before the

AWR data consists of two parts:1) system load and performance statistics stored in the memory are mainly queried through the v $ view;2) The mmon Process regularly saves AWR data in the memory to the SYSAUX tablespace using snapshots, which are

1. Create, configure, or delete a Database by running Oracle Database Configuration Assistant (you can also enter dbca in the command line );2. Create a database using command line3. Create, configure, or delete a database by running a custom batch

1. Use where to use having less; 2. When you query more than two tables, place less records on the right; 3. Reduce the number of table accesses; 4. When a where subquery exists, the subquery is placed at the beginning; 5. Avoid using * in the

Oracle Database Backup: -- Keep the backup record of the last week;==== Body:===== Start ======================Copy codeThe Code is as follows:Echo sets the backup file storage folder...Set "tbuf = E: \ Cway \ backup" Echo sets the backup file

1. create user username identified by password; // create a username and password for oracle and oracle2. grant connect, resource, dba to username; // authorize grant connect, resource, dba, sysdba to username;3. connect username/password.4. select

Oracle provides a variety of methods to reduce the time spent profiling Oracle SQL expressions. The profiling process will drag down the system performance when executing complex queries with a large number of execution plans. Now let's take a brief

1. If a query uses the grouping function, any column or expression that is not in the grouping function must be in group by; otherwise, an error occurs. In the first query, deptno does not appear in group by or in the grouping function. Therefore,

1. Create a test table: Copy codeThe Code is as follows:Drop sequence student_sequence;Create sequence student_sequence start with 10000 increment by 1; Drop table students;Create table students (Id NUMBER (5) primary key,First_name VARCHAR2 (20

1. query v $ database to obtain Because DBID has records in the control file and data file, you can query the v $ database view if you can mount the database. Copy codeThe Code is as follows:SQL> alter database mount;Database altered.SQL> select