Oracle

As shown in Figure 6.2. 6.3.1 the parameters of the General Information tab The General Information tab for the Edit database configuration appears as shown in Figure 6.3. 6.3.2 The parameters of the "Memory" tab Figure 6.4 Shows the Memory tab of

Starting with Oracle 12C allows different types of index to be created on the same column for performance tuning, with different types of index mainly including (B*tree vs bitmap,local vs Global)ORACLE 11G The code is as follows Copy

Using the callback interface in the Ibatis framework can also achieve bulk operation of the data, reduce the number of accesses to the database and improve performance. Here is an example of using the Ibatis framework to bulk INSERT data into an

Introduction to Usage REPLACE (char, search_string [, replacement_string]) Char: String to wait for replacement Search_string: Search for strings to replace Replacement_string: Replacement string If replacement_string is either default or null,

The code is as follows Copy Code Set Linesize 3000;Set heading off;Set feedback off;Set term off;Set pagesize 0;Set Trimspool on;Spool a.csv;Select C1_name| | ', ' | | C2_name from dual;Select C1| | ', ' | | C2 from TbtestSpool off;

Sometimes using Oracle's database, you need to judge when inserting data. For example, each person can only write one article per day.In the insertion of the time to make a judgment, check whether there is a person on the day of the operation of the

After executing the following SQL statement, we can get the SQL statements that we really want to execute, and then copy the SQL statements that the programs print out to execute. --delete Tables Delete data table The code is as

ALTER table: Add, modify, delete table columns, constraints, and other table definitions. View column: Desc table name; Modify table name: ALTER TABLE T_book Rename to BBB; Add column: ALTER TABLE name add column name varchar (30); Delete column:

A cold backup is a physical backup of a database file, usually after the database is shut down normally through a shutdown normal or shutdown immediate command. When the database is closed, the individual files it uses can be backed up. These files

paging test How do you split the result into pages and like ' limits ' in MySQL? // =========================================================== Tutorial by Neil Craig (neilc@netactive.co.za) date:2001-06-05 With this example, I'll explain

1. How to start Oracle Listening and instance automatically when Linux starts Modify the/etc/oratab file with the following command: [oracle@oracle11g ~]$ Vi/etc/oratab Found: Accp:/u01/oracle:n modified to: accp:/u01/oracle:y Step Two: add

     1. When creating a database, catproc must be run; otherwise, the following character set errors may occur when using rman:RMAN-00554: initialization of internal recovery manager package failedRMAN-04005: error from target database: ORA-06553:

Database engines with excellent design and performance can easily serve thousands of users at the same time. However, a database system with insufficient foundation will greatly reduce its performance as more users access the system at the same time.

Example: delete user abc,First, log on to the database as a sysdba user.$ Sqlplus/as sysdbaDelete User abcSQL> drop user abc cascadeNote: If the user abc is deleted, the schema objects under the user is deleted, and the corresponding tablespace is

At the end of June, we received an emergency support request from a customer. The customer's database was not long ago unable to start after the database was restarted due to a power outage in the data center.We remotely analyzed alert log and kfed

An oracle database in the company at the startup of the error ORA-27102: out of memory, specific as follows:Symptom: alter system set sga_max_size = 12884901888 scope = spfile --- (12G)Appears:SQL> startup forceORA-27102: out of memoryLinux-x86_64

How to open the standby database after Flashback:SQL> flashback database to restore point myrs1; Flashback complete. SQL> shutdown immediateORA-01109: database not open  Database dismounted.ORACLE instance shut down.SQL> startup mountORACLE instance

Rman uses the show command to display the current configuration parameters. For example, use show all to display ALL current configurations.RMAN> show all;RMAN configuration parameters:Configure retention policy to recovery window of 3

For Oracle DBAs, network configuration may be short. If Oracle databases are deployed in the public cloud, a DBA is almost required to become a full-stack engineer, because you do not need to install the network infrastructure, simple network

1. Stored Procedure1. Basic structureCREATE OR REPLACE PROCEDURE(Parameter 1 in number,Parameter 2 IN NUMBER) ISVariable 1 INTEGER: = 0;Variable 2 DATE;BEGINEND stored procedure name2. SELECT INTO STATEMENTSave the result of the select query to a