Oracle

Solution after the Oracle listener is suspended by the optimization master: An error occurred while starting the oracleorahome90tnslistener service. Information: The oracleorahome90tnslistener service cannot be started on the local computer,

DBAs often encounter such a headache: they do not know who created a user in Oracle and did not specify the default tablespace for this user, therefore, this user will use the default tablespace-system tablespace. As a result, the system tablespace

1. Test Environment SQL> select * from v $ version; BANNER ---------------------------------------------------------------- Oracle Database 10g Enterprise Edition Release 10.2.0.1.0-Prod PL/SQL Release 10.2.0.1.0-Production CORE 10.2.0.1.0

  The Blob field in Oracle is special. It has much better performance than the long field and can be used to save binary data such as sample slices.   Writing Blob fields is very different from writing other types of fields. Because Blob itself has

In the past few years, we have made data recovery orders and often encountered Oracle cases. When we recover data, how can we let users see what is in the oracle database, instead of one oracle data file, the following is my summary, which is useful

Sometimes, DBLink is one of the most convenient and convenient ways to manually synchronize data between two Oracle databases. The DBLink creation method is generally as follows: SQL codeCreate public database link connect to identified by using '

When a Java program connects to the oracle database, the oci driver has better performance than the thin driver. The main difference is that the oracle client does not need to be installed when the thin driver is used, but the oracle client must be

Manual configuration of Oracle 10G Enterprise ManagerThe following error is reported when oracle is installed several times;Enterprise Manager Configuration failed due to the following errorAn error occurred while starting Database Control.For more

You need to create these Delete statements, use the oracle Data dictionary to find all tables, views, and other objects under the user, and splice idioms. As follows: Select 'drop table' | table_name | ';' | chr (13) | chr (10) from user_tables; --

Oracle modifies dbid and dbname. Generally, This is not modified unless in special cases, such as database cloning. Step 1. back up the database 2. start data to mount status 3. nid command modification (if you only modify the dbid, you do not need

All about Data Guard 1. Data Guard Configurations (Data Guard Configurations) Data Guard is a collection composed of one primary database (production database) and one or more standby databases (up to nine). Databases that make up Data Guard are

Automatic Memory Management and statistics_level Automatic Shared Memory Management simplifies the configuration of the SGA. to use Automatic Shared Memory Management, set the SGA_TARGET initialization parameter to a nonzero value and set the

Oracle view, sequence and synonym, set operation 1. View (important) function: A View encapsulates a complex query statement. 1. syntax for creating a view: Create view name AS subquery example: create view empv20 as select * FROM emp WHERE deptno =

What do you mean by Cost Mr. the Lewis code is as follows, and the comments are slightly modified: [SQL]/* Script: first_rows. SQL Author: Jonathan Lewis Dated: June 2002 Purpose: problems with specified optimisation Last tested 10.1.0.4 9.2.0.6 8.1.

Step 1. step 1. shut down the database normally. 2. place the database in the mount status. 3. change the database to archivelog mode. 4. open the database 5. close the database normally and make a full backup sQL> conn / as sysdbaConnected to an

Oracle and DB2 basic operation commands 1. ORACLE1. basic commands 1. lsnrctl status-view the listener status-2. tnping orcl to view the connection status (orcl indicates the name of the listener) 2. restart the oracle database and listener in linux:

[Oracle]-[AWR/Stackpack]-AWR (Stackpack) Execution permission: Oracle 9i executes Stackpack (10 Gb is AWR). It is a common account and has no DBA permission. SQL> @awrrpt.sqlCurrent Instance~~~~~~~~~~~~~~~~ v$instance i *ERROR at line

Oracle partition, index, test (1) ----- insert only this time. See how to insert Fast Preparation SQL code -- data file alter system set db_create_file_dest = 'd: \ toby \ oracle \ data; -- tablespace create tablespace ts_sales_200901 datafile size 5

Oracle intersection, union, difference set [SQL] create table test1 (name varchar (10), NN varchar (10); insert into test1 values ('test', 'A '); insert into test1 values ('test1', 'B'); insert into test1 values ('test1', 'C'); insert into test1

ORACLE downgrade Import and Export we often need to import and export in different versions of the database, if you import from a lower version to a higher version, generally the problem is not big. however, importing a version from a higher version