查看oracle实例有哪些用户? 涉及的表为dba_users [oracle@rtest ~]$ sqlplus /nologSQL*Plus: Release 11.2.0.3.0 Production on Mon Sep 2 11:05:49 2013Copyright (c) 1982, 2011, Oracle. All rights reserved.idle conn /as sysdbaConnected.sys@TESTDB
查看oracle实例有哪些用户?
涉及的表为dba_users
[oracle@rtest ~]$ sqlplus /nolog SQL*Plus: Release 11.2.0.3.0 Production on Mon Sep 2 11:05:49 2013 Copyright (c) 1982, 2011, Oracle. All rights reserved. idle> conn /as sysdba Connected. sys@TESTDB> desc dba_users Name Null? Type ----------------------------------------------------- -------- ------------------------------------ USERNAME NOT NULL VARCHAR2(30) USER_ID NOT NULL NUMBER PASSWORD VARCHAR2(30) ACCOUNT_STATUS NOT NULL VARCHAR2(32) LOCK_DATE DATE EXPIRY_DATE DATE DEFAULT_TABLESPACE NOT NULL VARCHAR2(30) TEMPORARY_TABLESPACE NOT NULL VARCHAR2(30) CREATED NOT NULL DATE PROFILE NOT NULL VARCHAR2(30) INITIAL_RSRC_CONSUMER_GROUP VARCHAR2(30) EXTERNAL_NAME VARCHAR2(4000) PASSWORD_VERSIONS VARCHAR2(8) EDITIONS_ENABLED VARCHAR2(1) AUTHENTICATION_TYPE VARCHAR2(8)
查看用户状态:
sys@TESTDB> select username,account_status from dba_users; USERNAME ACCOUNT_STATUS ------------------------------ -------------------------------- SYS OPEN SYSTEM OPEN OUTLN EXPIRED & LOCKED MGMT_VIEW EXPIRED & LOCKED FLOWS_FILES EXPIRED & LOCKED MDSYS EXPIRED & LOCKED ORDSYS EXPIRED & LOCKED EXFSYS EXPIRED & LOCKED DBSNMP EXPIRED & LOCKED WMSYS EXPIRED & LOCKED APPQOSSYS EXPIRED & LOCKED APEX_030200 EXPIRED & LOCKED OWBSYS_AUDIT EXPIRED & LOCKED ORDDATA EXPIRED & LOCKED CTXSYS EXPIRED & LOCKED ANONYMOUS EXPIRED & LOCKED SYSMAN EXPIRED & LOCKED XDB EXPIRED & LOCKED ORDPLUGINS EXPIRED & LOCKED OWBSYS EXPIRED & LOCKED SI_INFORMTN_SCHEMA EXPIRED & LOCKED OLAPSYS EXPIRED & LOCKED SCOTT EXPIRED & LOCKED ORACLE_OCM EXPIRED & LOCKED XS$NULL EXPIRED & LOCKED BI EXPIRED & LOCKED PM EXPIRED & LOCKED MDDATA EXPIRED & LOCKED IX EXPIRED & LOCKED SH EXPIRED & LOCKED DIP EXPIRED & LOCKED OE EXPIRED & LOCKED APEX_PUBLIC_USER EXPIRED & LOCKED HR EXPIRED & LOCKED SPATIAL_CSW_ADMIN_USR EXPIRED & LOCKED SPATIAL_WFS_ADMIN_USR EXPIRED & LOCKED 36 rows selected.
比如解锁sh账户,sh账户为OCP考试需要用到的用户,SH账户里涉及的多张表在OCP有涉及考试。
目前SH的账户的状态为:EXPIRED & LOCKED
用以下命令给SH账户解锁:
sys@TESTDB> alter user sh account unlock; --解开LOCKED
sys@TESTDB> alter user sh identified by sh;--解开EXPIRED
sys@TESTDB> alter user sh account unlock; User altered. sys@TESTDB> select username,account_status from dba_users; USERNAME ACCOUNT_STATUS ------------------------------ -------------------------------- SYS OPEN SYSTEM OPEN SH EXPIRED OUTLN EXPIRED & LOCKED MGMT_VIEW EXPIRED & LOCKED FLOWS_FILES EXPIRED & LOCKED MDSYS EXPIRED & LOCKED ORDSYS EXPIRED & LOCKED EXFSYS EXPIRED & LOCKED DBSNMP EXPIRED & LOCKED WMSYS EXPIRED & LOCKED APPQOSSYS EXPIRED & LOCKED APEX_030200 EXPIRED & LOCKED OWBSYS_AUDIT EXPIRED & LOCKED ORDDATA EXPIRED & LOCKED CTXSYS EXPIRED & LOCKED ANONYMOUS EXPIRED & LOCKED SYSMAN EXPIRED & LOCKED XDB EXPIRED & LOCKED ORDPLUGINS EXPIRED & LOCKED OWBSYS EXPIRED & LOCKED SI_INFORMTN_SCHEMA EXPIRED & LOCKED OLAPSYS EXPIRED & LOCKED SCOTT EXPIRED & LOCKED ORACLE_OCM EXPIRED & LOCKED XS$NULL EXPIRED & LOCKED BI EXPIRED & LOCKED PM EXPIRED & LOCKED MDDATA EXPIRED & LOCKED IX EXPIRED & LOCKED DIP EXPIRED & LOCKED OE EXPIRED & LOCKED APEX_PUBLIC_USER EXPIRED & LOCKED HR EXPIRED & LOCKED SPATIAL_CSW_ADMIN_USR EXPIRED & LOCKED SPATIAL_WFS_ADMIN_USR EXPIRED & LOCKED 36 rows selected. sys@TESTDB> alter user sh identified by sh; User altered. sys@TESTDB> select username,account_status from dba_users; USERNAME ACCOUNT_STATUS ------------------------------ -------------------------------- SYS OPEN SYSTEM OPEN SH OPEN OUTLN EXPIRED & LOCKED MGMT_VIEW EXPIRED & LOCKED FLOWS_FILES EXPIRED & LOCKED MDSYS EXPIRED & LOCKED ORDSYS EXPIRED & LOCKED EXFSYS EXPIRED & LOCKED DBSNMP EXPIRED & LOCKED WMSYS EXPIRED & LOCKED APPQOSSYS EXPIRED & LOCKED APEX_030200 EXPIRED & LOCKED OWBSYS_AUDIT EXPIRED & LOCKED ORDDATA EXPIRED & LOCKED CTXSYS EXPIRED & LOCKED ANONYMOUS EXPIRED & LOCKED SYSMAN EXPIRED & LOCKED XDB EXPIRED & LOCKED ORDPLUGINS EXPIRED & LOCKED OWBSYS EXPIRED & LOCKED SI_INFORMTN_SCHEMA EXPIRED & LOCKED OLAPSYS EXPIRED & LOCKED SCOTT EXPIRED & LOCKED ORACLE_OCM EXPIRED & LOCKED XS$NULL EXPIRED & LOCKED BI EXPIRED & LOCKED PM EXPIRED & LOCKED MDDATA EXPIRED & LOCKED IX EXPIRED & LOCKED DIP EXPIRED & LOCKED OE EXPIRED & LOCKED APEX_PUBLIC_USER EXPIRED & LOCKED HR EXPIRED & LOCKED SPATIAL_CSW_ADMIN_USR EXPIRED & LOCKED SPATIAL_WFS_ADMIN_USR EXPIRED & LOCKED 36 rows selected.
查看SH用户有哪些表?
sh@TEST0924> select * from tab; TNAME TABTYPE CLUSTERID ------------------------------ ------- ---------- 1_EMP TABLE BIN$51XUts/lTCDgQwEAAH/BlA==$0 TABLE CAL_MONTH_SALES_MV TABLE CHANNELS TABLE COSTS TABLE COUNTRIES TABLE CUSTOMERS TABLE DIMENSION_EXCEPTIONS TABLE DR$SUP_TEXT_IDX$I TABLE DR$SUP_TEXT_IDX$K TABLE DR$SUP_TEXT_IDX$N TABLE DR$SUP_TEXT_IDX$R TABLE EMP_1 TABLE EMP_2 TABLE EMP_3 TABLE FWEEK_PSCAT_SALES_MV TABLE INVOICE TABLE NEW_SALES TABLE PRICE_LIST TABLE PRODUCTS TABLE PROFITS VIEW PROMOTIONS TABLE SALES TABLE SALES_TRANSACTIONS_EXT TABLE SUPPLEMENTARY_DEMOGRAPHICS TABLE TIMES TABLE TRANSACTIONS TABLE TRANSACTIONS1 TABLE 28 rows selected.

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Dreamweaver Mac version
Visual web development tools

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 Chinese version
Chinese version, very easy to use

WebStorm Mac version
Useful JavaScript development tools

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.