jde data dictionary table

1. Introduction 在InnoDB启动时，如果是新建数据库则需初始化库，需要创建字典管理的相关信息。函数innobase_start_or_create_for_mysql调用dict_create完成此功能。即创建数据字典，因为InnoDB系统表的个数结构固定，所以初始化库的时候只需要创建这几个表的B+树即可并将B+树的根页号存放到固定位置。对于B+树，只要找到根页面，就可以从根页面开始检索数据。相关系统表（即上一节讲到的4个系统表）在InnoDB内部，不会暴露给用户。 4个系统表通过固定的硬编码进行构建。具体原理流程如下。2. Data dictionary creation and loading principle flow3. Description1) The Innobase_start_or_create_for_mysql function calls the Dic

Data dictionary table for Oracle users, roles, and permissions (System and object permissions), and oracle dictionary 1. Three dictionary tables 1.1 users Select * from dba_users; Select * from all_users; Select * from user_users; 1.2 roles Select * from dba_roles; 1.3 Permi

Importance of oracle data dictionary and dynamic performance table: because the data dictionary contains user information, we need to query the data dictionary when logging on and have

This article turns from http://www.oicto.com/category/php/PHP generates MySQL data dictionary data table structure

[Data structure] Chapter 1 search! (Binary Search Tree bst avl Tree B-(+) tree dictionary tree HASH table ), Difficult to take notes... I was planning to use the result of one day before and after the result was dragged for five days. § 9. 1 static search table9.1.1 search for a sequence table Complexity O (n)9.1.2 qu

In the actual working environment, if you Truncate several data dictionary tables in the database during the operation, the database will no longer be available. In the actual working environment, if you Truncate several data dictionary tables in the database during the operation, the database will no longer be availab

, Sys_fieldsStores the defined index columns, one index column for each record:INDEX_ID：该列所在的索引IDPOS：该列在索引中第几列COL_NAME：列名The table primary key is (Index_id,pos)6, the Data Dictionary table root page location, in the InnoDB using the system tablespace No. 0 File number 7th page storage. This page stores the 5 root page

In the actual working environment, if you Truncate several data dictionary tables in the database during operation, the database will no longer be available, this article will give a detailed explanation of a related case. The example is as follows: Database environment: Oracle Database 9.2.0.7 RAC. (Note: the database is not backed up because the transaction volume of the database is large ). Truncated tab

CREATE TABLE' sys_dict ' (' ID ')INT(Ten) not NULLAuto_increment COMMENT'primary Key ID', ' Dict_type 'VARCHAR( -) not NULL DEFAULT "'COMMENT'Dictionary type', ' Dict_key 'INT(Ten) not NULL DEFAULT '0'COMMENT'Dictionary key', ' Dict_value 'VARCHAR( -) not NULL DEFAULT "'COMMENT'Dictionary value', ' sort 'INT(Ten) not NULL DEFAULT '0'COMMENT'Dictionary sort Values', ' Add_uid 'INT(Ten) not NULL DEFAULT '0'COMMENT'Add People', ' Update_uid 'INT(Ten) not

Locally vs. Dictionary Managed tablespacesorganized from :HTTP://WWW.ORAFAQ.COM/NODE/3.When Oracleallocates space to a segment (as a table or index), a group of contiguousfree blocks, called an extent, is ad Ded to the segment. Metadata regardingextent allocation and unallocated extents is either stored in the datadictionary, or in the tablespace itself. Tablespaces that record extentallocation in the

lengthDBMS_METADATA.GET_DDL: Generating DDL information for database objectsDbms_random: Fast generation of random numbersInitialize: Initialize Dbms_random package, must provide random number seedSeed: Reset random number SeedRandom: Production of stochasticDbms_flashback: Activates or disables the flashback feature of the session, which is required for ordinary users to use authorizationEnable_at_time: Activating session Flashback in a time-based mannerEnable_at_system_change_number: Flashbac

One of the problems encountered at work is converting an Excel data dictionary to PDM. But the conversion is completed in English, the original table name, the field name of the Chinese description is not.And for this problem can be done directly after the powerdesigner15.2, but their own 15.2 is not particularly familiar with, now the following is the use of VBS

Using System;Using Unityengine;Using System.Collections;Using System.Collections.Generic;public class MessageText{private static MessageText instance;Simple Interest Modepublic static MessageText Instance (){if (instance! = NULL) return instance;Instance=new MessageText ();return instance;} Dictionary////Initialize method, read data from table // Public MessageTe

Toad Export Data dictionary, export all table structure of database into HTMThe first step:Step two: Select the databaseStep three: Select paths and set other configurationsFourth step: After the successful build, the system will pop up a prompt to ask whether to open.The resulting table frame effect is as follows:A

[Oracle]-[ORA-01031]-create a view based on the data dictionary table without permission issue execution SQL> create or replace view redo_size as 2 select name, value from v$statname n, v$sesstat t, v$session s 3 where s.audsid = sys_context('USERENV','SESSIONID') 4 and t.sid = s.sid 5 and n.statistic#=t.statistic# 6 and n.name = 'redo size';sel

table Sql>set Linesize 132 Sql>set Pagezie 0 Sql>set Timing Off Sql>spool Drop_test_tables.sql Sql>select ' Drop table ' | | table_name| | '; ' From Dba_tables WHERE tablespace_name= ' tbs_test '; Sql>spool off C, Delete table sql> @drop_test_tables. sql This step takes about 20 seconds. D, delete this space. Sql>set Timing on Sql> drop tablespace tbs_test

Often check the data table do not know the meaning of the field, and then to look at the design table to see the meaning of the field, the database has been modified by many people, database design documents can not support the current table structure. Just want to make a data