Database Administrator

In Oracle databases, tables, indexes, stored procedures, and functions are all objects.The schema name is the same as the user name, but not the same as the user. If the user does not have any objects, the schema does not exist.I. TableORACLE tables

The execution speed of SQL statements may vary depending on many factors. However, the main influencing factors are: driving the table, executing the operation sequence, and applying the index. These factors can be indirectly changed by many

1. Download the 11g Release 1 (11.1.06) Linux installation package, 11.1.07patch Ii. Install Oracle Database 11.1.06 The installation must be performed on a non-root user; otherwise, an error occurs. Decompress the installation

Adump is generally audit dumpBdump is a background dump.Udump is user dump.Cdump is core dump. Recovery steps1. Restore data files2. Apply redo3. The database contains committed and uncommitted transactions.4. Application UNDO5. Recovered

ORA-26663 for removing process Errors When configuring Streams:SQL> exec dbms_apply_adm.drop_apply ('target _ APPLY_STREAM ');BEGIN dbms_apply_adm.drop_apply ('target _ APPLY_STREAM '); END; *ERROR at line 1:ORA-26663: error queue for apply process

During the past two days, Oracle triggers are learned. When you create a trigger, you may encounter an error message "you cannot create a trigger for objects owned by sys. User logon is a self-created new user XXX login, and then XXX user creates a

For more information about how to modify the database name in Oracle, see step by step. My friend asked me how to change the database name over the past two days, so I made a test and recorded it to illustrate the problem.How to modify the Database

1. latch free wait event SQL: Select *From v $ session_wait tWhere t. EVENT not in('SQL * Net message from client', 'rdbms ipc message ','SQL * Net more data from client',' SQL * Net more data to client ','SQL * Net message to client', 'jobq slave

Upgrade a single Oracle 11.2.0.1 instance to 11.2.0.3. Oracle upgrades are similar. Upgrade Oracle software and then Oracle instance. The patchset No of Oracle 11.2.0.2 is 10098816. For details about this Patchset, refer to the following

1. Download The mongodb-linux-i686-1.8.2.tgz in the directory/home/nh/Downloads/and unzip it to get the mongodb-linux-i686-1.8.2 2. Create the directory data1 under/home/nh/Downloads/mongodb-linux-i686-1.8.2 and create the file log1.log under

Guidance: Part 1: The following steps fully demonstrate the job creation process: Part 2: job-related knowledge: Part 3: Practical Application We found that the job owner must be used to delete jobs, and sys cannot delete other jobs! (First

MySQL partition Overview: Allows you to allocate multiple parts of a single table across file systems based on rules that can be set to any size. In fact, different parts of a table are stored as separate tables in different locations. The

Dynamic SQL loop traversal using Oracle dynamic cursors Create Or Replace ProcedureP_TEST_ SQLIs TYPE ref_cursor_typeISREFCURSOR;-- Define a Dynamic Cursor Tablename varchar2 (200)Default 'Ess _ client'; V_ SQL varchar2 (1000 ); Mobile varchar2

Create a tablespace in Oracle and grant permissions SQL>Create tablespace stu_dataDatafile 'e: \ G3T05 \ oracle \ t1 \ stu_data.dbf'Size 50 mAutoextend onNext 50 m maxsize 20480 mExtent management local; Tablespace created SQL>SQL>Create temporary

1: Generally, most of the codes used to access the database using the Hibernate Session are the same, as shown in the following two methods,  // Query the Teacher operation Ublic Teacher getTeacher (Long id) throws DataAccessException {

1. commands for starting Mysql in Linux:/Etc/init. d/mysql start2. Close the Mysql command:/Etc/init. d/mysql shutdown3. Restart the Mysql command:/Etc/init. d/mysql restart4. Create a user:Grant permissions (all indicates all permissions) on

When checking a set of DG databases a few days ago, when read only opens the stanby database, the following error log is found in alert. log: ........Wed Dec 14 15:45:19 2011Completed: alter database recover managed standby database cancelWed Dec 14

In Oracle, the management of scheduler is mainly implemented through dbms_scheduler. Previous work: Create a user: create user sched identified by oracle; Grant create session to sched; Grant scheduler_admin to sched; Log on to the database using

In Oracle, a keyword is NULL, indicating that a value is unknown and uncertain. Since it is unknown, there are several possibilities. Therefore, NULL is not a definite value. Let's take a look at two examples:Example 1: Declare V_b1 boolean: = null;

The first three paradigm of database design is that the independent table structure must have a unique primary key to identify the table data.SQL Server (duoOn the platform. Manually encode the primary key in the table and set it as an