data dictionary tables in oracle

Label: --table backups in the Oracle database: --BACKUP statement: After the backup, you can delete all the data sources for this table, but then someone will manipulate the table's data, but remember to restore the data table after the operation is complete. CREATE TABLEDzhyukkt_backup as SELECT * fromDzhyukkt;--quer

First, Oracle's dictionary and Dynamic Data dictionary views can basically be divided into three levels. 1.x$ table This section of the table is the basis for the operation of the Oracle database, which is dynamically created by the Oracle application when the database is

1.Query all tables under a user Select table_name from all_tables where owner = 'Scott '; query all tables belonging to the Scott user 2.QueryEMPAll fields (columns) in the table) Select * From all_tab_columns where table_name = 'emp '; 3.List the index columns of a table Select * From SYS. all_ind_columns where table_name = 'emp '; 4.List table Constraints Select * From all_constraints where t

Oracle uses a cursor to delete all record scripts in all user data tables. oracle cursor Application Scenario: because the data in the database involves confidential information, we hope to delete all the data at a time and only k

Tables store information about associated databases. Only Oracle databases can read and write these tables. Most users cannot access these tables because most of the data is stored in encrypted format. The following query returns all objects in USER mode: [SQL] SQL> SELECT o

Label:Extract the contents of the tables and LOB fields in the database files in the damaged disk by using the Oracle Dul tool In a 8i library recovery, as hard disk damage caused a number of tables to have a lot of paradoxical bad blocks, trying to use Dul to mine data, when using Dul 9 encountered a problem: when a t

usersDba_sources stored procedure information for all usersDba_segments use space information for all users ' segmentsDba_extents extended information for all segments of a userDba_objects basic information for all user objectsAll base tables that the cat current user can accesstab but all base tables, views, synonyms, etc. created by the previous userDict information for all

Large data tables in the Oracle database are partitioned to improve data reading efficiency: In PLSQL, directly add the Code: -- Purpose: to partition and convert large table data. In this example, only 5000 pieces of data are use

// In Oracle, we can view the object definition code from the data dictionary user_source (View;// Let's first look at the structure of the user_source View:Desc user_source;Name Type Nullable Default Comments-----------------------------------------------------------------------------------------------------NAME VARCHAR2 (30) Y Name of the objectTYPE VARCHAR2 (1

The following describes how to use common data dictionaries for Oracle users by category. I. Users View the current user's default tablespace SQL> SELECT username, default_tablespace FROM user_users; View the role SQL of the current user> SELECT * FROM user_role_privs; View the system and table-level permissions of the current user. SQL> SELECT * FROM user_sys_privs; SQL> SELECT * FROM user_tab_privs; Ii. T

Component Data Dictionary tables and viewsDatabaseV$database, V$version, v$instanceShared ServerV$queue, V$dispatcher, V$shared_serverConnection PoolingDba_cpool_info, V$cpool_stat, V$cpool_cc_statstablespacesUser_free_space, Dba_free_space, V$tempfile, Dba_users, Dba_ts_quotasControl FilesV$controlfile, V$parameter, v$controlfile_record_sectiondatafilesV$datafil

Oracle Creates table partitions based on existing tables and data and imports data. Assume that the existing System. Test Table has over 10 million data records and is in the ts_Test tablespace. The table contains column A, which partitions

SQL code used to query the names and data of tables with IDs greater than 10000 in Oracle -- query the data with IDs greater than 10000 in all tables and the corresponding table name select 'select id, ''' | table_name | ''' as tablename from '| table_name | 'where id> = 100

1. Two Ways to delete table data A. Delete * From my_table; B. truncate table my_table; 2. Delete the entire tableDrop table my_table; How can we recover tables accidentally dropped? In fact, Oracle also has a similar "recycle bin" For example, you accidentally deleted the my_table table.Drop table my_table;When you use the SELECT statement to query this