Oracle

The multi-Table tree query area of Oracle is a tree structure, and there is a structure below the region, that is, there is a region ID field in the organization table. These two things should be put together and put on a tree. At first, I thought

Oracle export data summary about Database Export make a summary to facilitate later search and export your own table exp userid = username/password @ database instance name tables = (table 1, Table 2 ...) file = backup path, for example, export

I attended an ORACLE interview some time before the ORACLE cursor FOR loop. When I asked what is the difference between opening the cursor in a common way and opening the cursor in a FOR loop way, my mind was blank, because the FOR loop has never

To solve a PL/SQL logon problem, install Oracle11gR2 of win64 and PL/SQL. An initialization error occurs during logon. The following message is displayed: make sure you have the 32 bits oracle client installed. Solution: Download instantclient-basic-

INDEX FAST FULL SCAN AND SKIP SCANWhen quickly scanning an index, oracle reads all leaf node blocks of the B-tree index in sequence and can read db_file_multiblock_read_count at the same time,In addition, quick indexing is much smaller than full

The method of locating library cache lock often shows that some of the brothers on PUB say that library cache lock and PIN errors do not know how to handle them, and the problem cannot be located. Let me say a few words, based on my work experience,

Query the nth information in the Oracle databaseI want a piece of data from the Oracle database in the development program. As the question. Obtain the second data. It indicates: t_ltr_kjmxAnswer: select * from (select * from t_ltr_kjmx order by

Oracle scheduled task failure solution found that the system data was not updated. Check that the oracle scheduled task was not executed. The next_date is changed to 4000/1/1, and the broken is selected. Select * from user_jobs: the number of failed

Sqlplus configuration and session SQL tracking [plain] When sqlplus is started, the two files login. SQL and glogin. SQL will be searched and loaded. The glogin. SQL file is stored in the $ ORACLE_HOME/sqlplus/admin directory by default, and login.

[Oracle] the quick way to DELETE duplicate data is that you have never seen this method on the Internet: delete from prod_grid_incWHERE rowid in (SELECT B. row_id2 FROM (select rowid row_id2,. *, row_number () over (partition by. prod_id order by.

Oracle performs an update error. How to restore the data before the first step: In the v $ sqlarea view, find the time when you operate the SQL statement; select r. FIRST_LOAD_TIME, r. * from v $ sqlarea r order by r. FIRST_LOAD_TIME desc; Step 2:

Oracle database 11g new feature settings result cache oracle database 11g new feature settings result cacheIf the system has not used result cache before, use alter system set result_cache_max_size = scope. Although the result_cache_max_size value

Introduction to the features of Oracle data files we all know that each Oracle database has one or more physical Oracle data files and database information (structure and data) the main function of Oracle is to store these data files, and only these

Oracle dg introduction (physical no-instance) DG is a disaster tolerance solution provided by oracle, which is available only for the Enterprise Edition and unavailable for the Standard Edition, DG can have a maximum of nine slave nodes. It can be

Modify oracle primary key auto-increment settings 1. create a primary key constraint when creating a table (1) no name for create table student (studentid int primary key not null, studentname varchar (8), age int); (2) create table students

Connect... start... syntax: Java code select * from some_table [where condition 1] connect by [condition 2] start with [Condition 3]; the order of the connect by and start with statements does not affect the query results. [where condition 1] is not

Oracle obtains the DDL statement SQL code SET LONG 2000000 SET PAGESIZE 0 EXECUTE DBMS_METADATA.SET_TRANSFORM_PARAM (DBMS_METADATA.SESSION_TRANSFORM, 'store', false); select dbms_metadata.GET_DDL (u. object_type, u. object_name, 'Scott ') from

Manage undo tablespace 0. CREATE undo tablespace: create undo tablespace undotbs_02 DATAFILE '/u01/oracle/rbdb1/undo0201.dbf' SIZE 2 m reuse autoextend on; 1. ADD a data file: alter tablespace undotbs_01 add datafile '/u01/oracle/rbdb1/undo0102.dbf'

Restrictions: constraints are used to ensure that database data meets specific business logic or enterprise rules. If constraints are defined and the data does not comply with the constraints, therefore, DML operations (INSERT, UPDATE, and DELETE)

Oracle10g use pipelines to quickly import and export data 1. Create a DIRECTORY and create a storage DIRECTORY: mkdir-p/home/oracle/dir_dp. log on to the oracle command line and execute the following command: sqlplus/as sysdba; create directory