data dictionary tables in oracle

CREATE TABLE Space/* divided into four steps *//* Step 1th: Create a temporary tablespace */Create temporary tablespace user_tempTempfile ' D:\oracle\oradata\Oracle9i\user_temp.dbf 'Size 50mAutoextend onNext 50m maxsize 20480m//Assuming maximum value is not capped, use unlimitedExtent management Local; The extent indicates that interval settings are managed in a local way and the second way is dictionary

CREATE TABLE Space/* divided into four steps *//* Step 1th: Create a temporary tablespace */Create temporary tablespace user_tempTempfile ' D:\oracle\oradata\Oracle9i\user_temp.dbf 'Size 50mAutoextend onNext 50m maxsize 20480m//If the maximum value is not capped, use unlimitedExtent management Local; Extent indicates that interval setting interval management mode is local mode another way is dictionary

The main function of library cache is to store user-submitted SQL statements, SQL statement-related parse tree (parse tree is the representation of all objects involved in SQL statements), execution plan, user-submitted PL/SQL program block (including anonymous blocks, stored procedures, packages, Functions, and so on, and the code they convert to be executed by Oracle. To manage these memory structures, the library cache contains a number of control

Dictionary Management table Space-DMT Local management table space-LMT The Dictionary Management table space (dictionary-managed tablespace, DMT), 8i previously includes a table space management model that can be used in the future, managing the space use of tablespaces through a data

When you connect to a 10 Gb database using the oracle 9I em console client and use the normal connection identity, a message indicating a lack of select any dictionary permissions is displayed. However, you can connect to the cluster by using the sysdba identity or the normal identity of PL/SQL ~ This is a bug in oracle9I, and oracle is not going to solve this pr

create SQL _text for some dictionary tables. This is because Bootstrap $ is a natural egg, when c_obj #, Tab $, and so on are incubated, the chickens continue to generate eggs, and the database dictionary table structure is established. Therefore, bootstrap $ is the first table in Oracle! Each time the database is sta

, the data for the temporary table is automatically emptied,However, the structure of the temporary table and the metadata are also stored in the user's data dictionary. Temporary tables are only supported in oracle8i and above products. 2 Detailed Introduction Oracle tem

Some people on the Internet have provided the best optimization ideas for the application of temporary tables in Oracle temporary tables: 1. first, extract the records that meet the conditions in the large table to generate a temporary table. 2. then, associate the small temporary table with another small table. regardless of whether the thinking is debatable or

Tags: des cWeb style blog http color os io use2014-08-25 BaoxinjianI. Summary Oracle external tables are used to access text files other than databases (text file) or Oracle proprietary format files.Therefore, creating an external table does not result in a storage structure such as segments, extents, and data bl

Anyone familiar with Oracle knows that when the Oracle database cannot be started normally, you can use dul or other third-party tools to directly read data in the data file to save data and reduce losses, if the innodb engine is used in mysql, related records can be extract

Temporary tablesIn Oracle, a temporary table is "static," which, like a regular datasheet, needs to be created only once, and its structure is valid for the entire period from creation to deletion. In contrast to other types of tables, a temporary table allocates space for the user when the data is actually added to the table, and the allocated space is from the