mysql data dictionary

#!/usr/bin/python#coding=utf-8__author__= ' Moxiaokai ' #通过参数传递 to determine if a data type such as a number, string, list, tuple, or dictionary is a variable data object a =2b= ' aha ' c=[1,2,3]d= (1,2,3) e= {' Tom ':11, ' Sam ':57, ' Lily ': 100}defnum (x): #数字 x=100printxnum (a) print NBSP;ADEFNBSP;STR (x): #字符串 x= ' Ade ' printxstr (b) printbdeflist (x): #

table, add this conditionORDER BY A.id,a.colorder The second company uses MySQL5.6, which is simple to generate a data dictionary: USE information_schema; select t . Table_schema as , t . table_name as , t . Table_type as , t . engine as , c . Ordinal_position as , c . column_name as , c . Column_type as , c . is_nullable as , c . Column_key as , c . EXTRA as , c . Character_s

Data Dictionary and dynamic performance View Introduction: What is a data dictionary? Data dictionary is the most important component of Oracle databases. It provides some system information about the database. The dynamic perform

apply to all States of an instance or database. For example, if an instance has just started,but no database is mounted, you can view the columns of a running background process by querying v$bgprocesstable. However, you cannot view the status of a database data file by querying V$datafile because you want to load the databaseto read the control file before it can find the data file associated with the dat

Data dictionary and Data dictionary viewA data dictionary is a set of system tables created and maintained by an Oracle server. Sys user owns all the data

Oracle manages and presents database information through a data dictionary, which typically stores the metadata of the database and is the database's database. The commonly mentioned data dictionary consists of 4 parts:Internal RDBMS (x$) tables, data

[Oracle11g, 8] data dictionary and Character Set, oracle11g Character SetI. Data Dictionary: oracle's data dictionary records the metadata of database management. It is a core file of life and death for databases. 1. Place the

A. Data dictionary:Oracle's data dictionary records the metadata of database management, which is the core file of life and death for a database. 1. The data dictionary is placed in the system table space, and the user is sys. 2. Describe the definition of databases and obje

I. Oracle DATA dictionaryA data dictionary is where Oracle stores information about a database and uses it to describe the data. For example, the creator information of a table, create time information, the table space information, user access rights information, and so on. 　　When users encounter difficulties in manipu

Label:First, the conceptThe data dictionary is the most important part of the Oracle database, and it provides some system information about the database.The dynamic performance View records information about the startup of the routine. Second, the data dictionary1), the data dict