Oracle

Oracle optimization is a double-edged sword, paying special attention to the occasion of this sword: system planning OLTP or OLAPOptimization 1: IndexIn DML operations, the index must be maintained, and if a large number of DML operations, think

1: Installation: 11g version R2CD $ORACLE _home/Find. -name ins_rdbms.mkCD Rdbms/libMake-f ins_rdbms.mk $ORACLE _home/rdbms/lib/bbedThe error will be in 11g. Three files need to be downloaded online. Or you have a 10g library to directly copy the

First, downloadcan go to Oracle official website download: http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html (note, select the above accept LicenseAgreement option, and then select the version you want in the list

CREATE table space before importing dataImport command Imp file= full=y Enter user name password possible table space does not exist to create/* divided into four steps *//* 1th step: Create temporary tablespace   */ Create temporary tablespace user_

The writing of this article has been greatly helped by the withered flourish elders, and I would like to express my thanks.The Oracle DB version that this article applies to is Oracle 10g or later.This view is important because there is a column in

1. start the Oracle database Listener execution su–oraclelsnrctl Start after the execution lsnrctl Status View current listener status, found: 650) this.width=650; "Src=" http://s3.51cto.com/wyfs02/M01/3E/3C/ Wkiom1pgkpuy8sftaaql0vuzjm8062.jpg

When diagnosing a performance problem with SQL, we sometimes need to get the actual value of its bound variable, and then bring the actual value into the SQL statement, make a SELECT statement with the original SQL (with the Where condition),

Whether the Oracle database object is locked query SQL and the unlock process SQL are described below:--Query the object being locked under the current userSELECT B.object_name, B.owner, C.sid,c.serial#,c.osuser, C.machine, c.terminalFrom

SELECT * from Dba_users; View all users in the database, provided that you are an account with DBA authority, such as Sys,systemSELECT * from All_users; See all the users you can manageSELECT * from User_users; View Current User InformationTo query

Name and comments of Oracle query tableSelect a.table_name,b.comments from user_tables a,all_tab_comments b where a.table_name=b.table_nameName and comments of the query fieldSelect distinct a.column_name,b.comments from user_tab_columns

From Tan Huaiyuan--Database NavigatorBackground processFirst, System Monitor (Smon)Instance recovery (after an abnormal shutdown)Second, Process Monitor (Pmon)Rolling back a transactionRelease locks and other resourcesRestart the dead scheduler. (in

------MySQLStrconnect.format ("provider=msdasql.1;driver={%s}; server=%s;database=%s; uid=%s; pwd=%s; ","MySQL ODBC 5.2 Unicode Driver"//strdriver/*mysql driver, such as: "MySQL ODBC 3.51 Driver" */;, "localhost"//strserverpath/* database path,

I. Table-ParagraphTable partitioning: Easy to delete operations, etc.You can delete the partition table directly (quickly).High efficiency when using conditions such as while.Second, the indexImprove query speedaffect DML (update, INSERT, delete)

We need to set the time interval when we use the Dbms_job package for timed job, so we need to know the basic method of adding and reducing time.Sql> AlterSessionSetNls_date_format='YYYY-MM-DD Hh24:mi:ss'; The session has changed. SQL> SelectSysdate,

----Create an Oracle snapshot manuallyBEGINDbms_workload_repository. Create_snapshot ();END;/---delete a snapshotSpecific snapshot information can be viewed in view Dba_hist_snapshotBEGINDbms_workload_repository. Drop_snapshot_range (low_snap_id =

In the development of the report, it is unavoidable to encounter the problem of row to column.For example, in the case of Scott's EMP in Oracle, you can use "Row to column" to count the number of people in each position in each department:The

Recently, I have made further analysis and research on rownum when I use Oracle's rownum to realize pagination display. Now summarized as follows, hope to bring you a harvest.For rownum It is the number of the Oracle system order assigned to the

Oracle Database Backup skills Use the techniques listed below to ensure that you do not forget the key steps during the weekly database backup process. Back up the primary database once a week. If you create, modify, or stop a database, add a new

. NET connection to Oracle,. net connection to oracle How to connect. NET to Oracle Method 1: connect directly using the. NET oracle driver Reference System. data. oracleclient; Using System. data. oracleclient; String oradb = "Data Source =

Summary of ORACLE optimizer RBO and CBO, and oracle rbocbo Optimization RBOAnd basic CBO concepts The Optimizer in the Oracle database is also called the Query Optimizer ). It is an optimization tool for SQL analysis and execution. It is