今天在新数据库上面创建一个USER时，要求配置资源限制，很久没有玩ORACLE了，这个东西还玩得差不多了。userprofile包括了两部分内容，1.是资源的限制，但是这个
今天在新数据库上面创建一个USER时，要求配置资源限制，很久没有玩ORACLE了，这个东西还玩得差不多了。
user profile包括了两部分内容，1.是资源的限制，但是这个默认是不生效的，香港服务器，要启动(resource_limit为true)才生效。2.用户密码限制，这个配置后，再用户下次登陆就生效。通过user profile配置的限制都是在用户下次登陆时生效，对当前的session不生效。数据库中有一个默认的profile,名字是DEFAULT，在11G前这个DEFAULT没有任何的限制，但是从11G开始，对PASSWORD_LIFE_TIME 为180，FAILED_LOGIN_ATTEMPTS为10次。
资源的限制包括下面几个部分
密码限制由下面几个部分组成
下面是详细的说明
SESSIONS_PER_USER：指定每一个用户最大可以并发sessions，如果达到了最大session后会报ORA-02391: exceeded simultaneous SESSIONS_PER_USER limit错误
CPU_PER_SESSION：指定每一个SESSION总共使用CPU时间，单位是1/100秒，如果超过后会报下面的错误ORA-02392: exceeded session limit on CPU usage, you are being logged off
CPU_PER_CALL：每一次CALL使用的CPU时间，也就是一条SQL调用（a parse, execute, or fetch），单位是1/100秒，如果超过后会报ORA-02393: exceeded call limit on CPU usage。
CONNECT_TIME：限制一个session总的连接时间，单位为分钟。如果超过最大值会报ORA-02399: exceeded maximum connect time, you are being logged off
IDLE_TIME：指定一个session空闲的时间，单位为分钟。如果超过最大值会报ORA-02396: exceeded maximum idle time, please connect again
LOGICAL_READS_PER_SESSION：限制每一个session读取logical块的个数。
LOGICAL_READS_PER_CALL：限制一条SQL读取logical块的个数。如果超过最大值会报ORA-02395: exceeded call limit on IO usage
PRIVATE_SGA：限制一个session在sga中私有空间的分配。
COMPOSITE_LIMIT:指定一个session总的资源代价。
FAILED_LOGIN_ATTEMPTS：指定帐户在被锁之前可以使用错误密码尝试登陆的次数，默认是10次
PASSWORD_LIFE_TIME：指定密码存活的天数，默认是180天。
PASSWORD_LOCK_TIME：登陆失败过，帐户被锁定的天数。默认值是1天。
PASSWORD_GRACE_TIME：指密码到期后，还可以使用多少天来登陆数据库，默认是7天。
PASSWORD_VERIFY_FUNCTION：指定密码验证函数。如果为null就表示没有。
PASSWORD_REUSE_TIME and PASSWORD_REUSE_MAX ：这个两个参数要一起配置才会生效，PASSWORD_REUSE_TIME指相同密码被重用的间隔天数，PASSWORD_REUSE_MAX相同密码再次被重用要求最低的密码修改次数（不包括本次修改成重用密码）
下面是开始测试：
测试环境：OS RHEL 5.6 X86_64 DB:11.2.0.2
1，香港服务器，创建profile
2.查看profile的内容
3 修改/查看某个用户的profile
4 修改profile中的资源的值。
这里包括两部分的内容，1.修改成用户指定的值，2.是修改成系统默认的值
5 删除profile
当某个profile被删除时，如果这个profile已经被分配给某个用户，那么我们在删除的时候要加上cascade，并且已经被分配的用户的profile会被自己修改成default profile。
6。修改参数，使资源限制生效
这个参数默认值是false,是一个动态参数
user profile这个比较操作比较简单，香港服务器租用，重要的是要理解里面参数的含意。
下面是资源限制达到最大值后的报错提示。
本文出自 “认真就输” 博客，请务必保留此出处
What are the differences in syntax between MySQL and other SQL dialects?Apr 27, 2025 am 12:26 AMMySQLdiffersfromotherSQLdialectsinsyntaxforLIMIT,auto-increment,stringcomparison,subqueries,andperformanceanalysis.1)MySQLusesLIMIT,whileSQLServerusesTOPandOracleusesROWNUM.2)MySQL'sAUTO_INCREMENTcontrastswithPostgreSQL'sSERIALandOracle'ssequenceandt
What is MySQL partitioning?Apr 27, 2025 am 12:23 AMMySQL partitioning improves performance and simplifies maintenance. 1) Divide large tables into small pieces by specific criteria (such as date ranges), 2) physically divide data into independent files, 3) MySQL can focus on related partitions when querying, 4) Query optimizer can skip unrelated partitions, 5) Choosing the right partition strategy and maintaining it regularly is key.
How do you grant and revoke privileges in MySQL?Apr 27, 2025 am 12:21 AMHow to grant and revoke permissions in MySQL? 1. Use the GRANT statement to grant permissions, such as GRANTALLPRIVILEGESONdatabase_name.TO'username'@'host'; 2. Use the REVOKE statement to revoke permissions, such as REVOKEALLPRIVILEGESONdatabase_name.FROM'username'@'host' to ensure timely communication of permission changes.
Explain the differences between InnoDB and MyISAM storage engines.Apr 27, 2025 am 12:20 AMInnoDB is suitable for applications that require transaction support and high concurrency, while MyISAM is suitable for applications that require more reads and less writes. 1.InnoDB supports transaction and bank-level locks, suitable for e-commerce and banking systems. 2.MyISAM provides fast read and indexing, suitable for blogging and content management systems.
What are the different types of JOINs in MySQL?Apr 27, 2025 am 12:13 AMThere are four main JOIN types in MySQL: INNERJOIN, LEFTJOIN, RIGHTJOIN and FULLOUTERJOIN. 1.INNERJOIN returns all rows in the two tables that meet the JOIN conditions. 2.LEFTJOIN returns all rows in the left table, even if there are no matching rows in the right table. 3. RIGHTJOIN is contrary to LEFTJOIN and returns all rows in the right table. 4.FULLOUTERJOIN returns all rows in the two tables that meet or do not meet JOIN conditions.
What are the different storage engines available in MySQL?Apr 26, 2025 am 12:27 AMMySQLoffersvariousstorageengines,eachsuitedfordifferentusecases:1)InnoDBisidealforapplicationsneedingACIDcomplianceandhighconcurrency,supportingtransactionsandforeignkeys.2)MyISAMisbestforread-heavyworkloads,lackingtransactionsupport.3)Memoryengineis
What are some common security vulnerabilities in MySQL?Apr 26, 2025 am 12:27 AMCommon security vulnerabilities in MySQL include SQL injection, weak passwords, improper permission configuration, and unupdated software. 1. SQL injection can be prevented by using preprocessing statements. 2. Weak passwords can be avoided by forcibly using strong password strategies. 3. Improper permission configuration can be resolved through regular review and adjustment of user permissions. 4. Unupdated software can be patched by regularly checking and updating the MySQL version.
How can you identify slow queries in MySQL?Apr 26, 2025 am 12:15 AMIdentifying slow queries in MySQL can be achieved by enabling slow query logs and setting thresholds. 1. Enable slow query logs and set thresholds. 2. View and analyze slow query log files, and use tools such as mysqldumpslow or pt-query-digest for in-depth analysis. 3. Optimizing slow queries can be achieved through index optimization, query rewriting and avoiding the use of SELECT*.
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Atom editor mac version download
The most popular open source editor
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
Dreamweaver CS6
Visual web development tools
SublimeText3 Chinese version
Chinese version, very easy to use
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
