Oracle

Use the Dept table under the Scott account;SELECT * FROM Dept order by Deptno;Ten ACCOUNTING NEW YORKDALLASSALES CHICAGOOPERATIONS BOSTONFor demonstration convenience, insert a piece of data:INSERT INTO Dept (Deptno, dname, loc) VALUES ("SYSTEM", '

--View disk statements that consume the most disk read and write ratesSELECT *From (select v.sql_id,V.child_number,V.sql_text,V.elapsed_time,V.cpu_time,V.disk_reads,Rank () Over (order by v.disk_reads Desc) Elapsed_rankFrom V$sql v) awhere

--View disk statements that consume the most disk read and write ratesSELECT *From (select v.sql_id,V.child_number,V.sql_text,V.elapsed_time,V.cpu_time,V.disk_reads,Rank () Over (order by v.disk_reads Desc) Elapsed_rankFrom V$sql v) awhere

1.how to find invalid status stored procedure and recompile them?SELECT object_name, status from user_objects WHERE object_type = ' PROCEDURE ';Alter procedure Schme.procedurename Compile;Lack of practice is not a complete study of learning,

Table 5-4 Oracle Database Background Processes Process Name Description Database writer (DBWN) The database writer writes modified blocks from the Database buffer cache to the data files. Oracle

Necessary component InstallationActivePython python Windows Support components Unix-like systems have their own Python components download "Baidu ActivePython"oracle_client Oracle Database Link Component "Cannot link to database if not

In Oracle, you can control which IPs can connect to the database and which IP cannot connect to the database. In 9i and later, simply set the allowed IP and banned IP, modify Sqlnet.ora is the best and fastest method1. Modify the Sqlnet.ora fileIn

 1. Using Oracle to compress BLOB objectsL_blob: = utl_compress.lz_compress (L_blob);2. Convert BLOBs to ClobFUNCTION Blob_to_clob (blob_in inch BLOB) RETURN CLOB 

1. User-Createdsql> CREATE USER rusking2 identified by rusking3 Default Tablespace users-specifies that the defaults table space is users. If you use the system default Tablespace, you can actually do so without specifying it.4 QUOTA 10M on the

Invoking an Oracle stored procedure in JavaThis article describes how to invoke Oracle's stored procedures through Java1. Writing Stored ProceduresCREATEORPROCEDURE sp_pro3(sp_name VARCHAR2,sp_sal NUMBER )ISBEGIN --根据用户名修改工资 UPDATE emp SET sal=sp_

In the case of like, there are two forms of writing that are based on a 5% assessment of the total data.sql> drop table test purge;sql> CREATE TABLE test as SELECT * from Dba_objects;sql> exec dbms_stats.gather_table_stats (user, ' test ');Sql>

Use the spool command to copy the results of the output from the Sql*plus to a specified file, or the results of the querySend to the printer and use the spool off command directly.The syntax of the spool command is as follows:Spool [file_name

--1. Create TABLE SpaceDROPTablespace flhis including CONTENTS anddatafiles;CREATEtablespace flhis datafile'F:\app\oracle\oradata\orcl\flhis.dbf'SIZE 200M Autoextend on NEXT2M MAXSIZE unlimitedloggingonlinePERMANENTEXTENT MANAGEMENT LOCAL

using the Sqlplus spool command  Operation Steps1. Create a new script file and store it, such as D:\spool.sql, with the following code Set echo off-when executing an SQL script with the start command, displays the SQL statement being executed in

1. Connect to the database# su-oracle$ conn/as SYSDBA2. CREATE TABLE Spacesql> Create tablespace doiido datafile '/main/oracle/oradata/doiido.dbf ' size 1024M autoextend on next 1024M maxsize 10 240M extent management Local;3. Create userSql> create

There was a script that ran for a long time without results, and the results were instantly optimized. The original statement is as follows:sql> explain plan for 2 select * 3 from Crm_dg.tb_ba_channelstaff A, 4 crm_dg.tb_ba_s Ubscription_hist B, 5

Oracle start commandThe start command can read the content in the file to the buffer, and then run the content in SQL * PLUS. the syntax of the start command is as follows:Start {url | file_name}The url is used to specify a url address, such as http:

ORACLE11GDataGuard role conversion1. ORACLE login uard Role SwitchingDataGuard已经是现今标准的主流容灾方案，由于日志传递对于网络适应程度强，且可以采用同步实时的传递方式和异步延迟的传递方式，甚至可以成为远程的异地容灾方案。不管用于何种用途，DG都免不了要进行角色转换，即将standby 数据库切换为primary数据库，角色转换分为：switchover和failover两种2. similarities and

Oracle restrict connected IP addressesIn oracle, you can control which IP addresses can connect to the database and which IP addresses cannot connect to the database. In 9i and later, setting the allowed IP address and the prohibited IP address is

Oracle10gLsnrctl does not reflect that the database cannot be connectedSymptom Description: The oracle version used is 10.2.0.1.0 in linux. If lsnrctl status is entered on the command line interface, no response is returned. If lsnrctl stop is