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主要内容: 1.MySQL压力测试基准值; 2.mysqlslap的介绍及使用; 3.sysbench的介绍及使用; 4.tpcc-mysql的介绍及使用; MySQL压力测试基准值 1.压力测试的目的: 1.确认新的MySQL版本性能相比之前差异多大;比如从5.6变成5.7,或者从官方版本改成Percona分支版本; 2.确认新的服务器性能是否更高,能高多少;比如CPU升级了,阵列卡cache加大了,从机械盘换成SSD盘了; 3.确认一些新的参数调整后,对性能影响多少;比如innodb_flush_log_at_trx_commit,sync_binlog等参数; 4.确认即将上线的新业务对MySQL负载影响多少,是否能承载得住,是否需要对服务器进行扩容或升级配置; 2.针对不同的压测目的,相应的测试方法也有所不同: 1.先说第四种,需要和线上业务结合起来,这时候就需要自行开发测试工具,或者利用tcpcopy(https://github.com/session-replay-tools/tcpcopy)将线上实际用户请求导向测试环境,进行仿真模拟测试; 2.对于前三种,我们通常采用基准测试就可以;比较常用的MySQL基准压力测试工具有tpcc-mysql,sysbench,mysqlslap等几个; 3.如何避免压测时受到缓存的 ...继续阅读 (48)

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问题描述: 1.Oracle11.2.0.3 DataGuard环境,主库在做表空间扩容时添加了很多数据文件,但是备机空间不足,导致文件创建失败,进而无法正常同步; 2.在备库的alert文件中报ORA-01274的错误,提示创建失败的文件在控制文件中被重命名为$ORACLE_HOME/dbs/UNNAMED0048,而且MRP进程中止;处理步骤: 1.修改备机管理模式为手动:ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT = MANUAL; 2.创建丢失文件:ALTER DATABASE CREATE DATAFILE '/oracle/product/11.2.0/db_1/dbs/UNNAMED00048' AS '/oradata/htcwdb/NNC_DATA0306.dbf'; 3.修改备机管理模式为自动:ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT = AUTO; 4.恢复日志[并从主机接收日志]:RECOVER STANDBY DATABASE [DISCONNECT FROM SESSION];或者 5.接受日志并实时应用:ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM S ...继续阅读 (110)

Table of Contents 1.MySQL Full-Text Search Introduction 2.Three Types of Full-Text Searches 3.MySQL Full-Text Stopwords 4.Fine-Tuning MySQL Full-Text Search 5.MySQL Full-Text RestrictionsMySQL Full-Text Search Tutorial ...继续阅读 (43)

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Table of Contents 1.Various files that are created by InnoDB 2.Logical data organization like tablespaces, pages, segments and extents 3.Explore each of them in some detail and discuss about their relationship with each other 4.Data layout within the InnoDB storage engineData Organization in InnoDB ...继续阅读 (24)

主要内容: 1.简单介绍; 2.安装的必要条件; 3.下载并部署插件; 4.配置一个MySQL目标端; 5.删除一个目标端; 6.相关日志;Oracle Enterprise Manager for MySQL Database Installation ...继续阅读 (30)

主要内容: 1.12c Cloud Control Agent介绍; 2.添加主机资源; 3.添加数据库等其它资源;Oracle Enterprise Manager Cloud Control 12cR5 Agent Installation ...继续阅读 (45)

主要内容: 1.准备环境; 2.安装数据库软件; 3.创建资源库; 4.安装12c Cloud Control; 5.启动和关闭;Oracle Enterprise Manager Cloud Control 12c Release 5 Installation on Oracle Linux 6.6 ...继续阅读 (39)

explain显示了mysql如何使用索引来处理select语句以及连接表。可以帮助选择更好的索引和写出更优化的查询语句。 使用方法，在select语句前加上explain就可以了： 如：explainselectsurname,first_name form a,bwherea.id=b.idEXPLAIN列的解释：table：显示这一行的数据是关于哪张表的 type：这是重要的列，显示连接使用了何种类型。从最好到最差的连接类型为const、eq_reg、ref、range、indexhe和ALL possible_keys：显示可能应用在这张表中的索引。如果为空，没有可能的索引。可以为相关的域从WHERE语句中选择一个合适的语句 key： 实际使用的索引。如果为NULL，则没有使用索引。很少的情况下，MYSQL会选择优化不足的索引。这种情况下，可以在SELECT语句中使用USE INDEX（indexname）来强制使用一个索引或者用IGNORE INDEX（indexname）来强制MYSQL忽略索引 key_len：使用的索引的长度。在不损失精确性的情况下，长度越短越好 ref：显示索引的哪一列被使用了，如果可能的话，是一个常数 rows：MYSQL认为必须检查的用来返回请求数据的行数 Extra：关于MYSQL如何解析查询的额外信息。将在表4.3中讨论， ...继续阅读 (34)

processlist命令的输出结果显示了有哪些线程在运行，可以帮助识别出有问题的查询语句，两种方式使用这个命令。 1.      进入mysql/bin目录下输入mysqladmin processlist; 2.      启动mysql，输入show processlist; 如果有SUPER权限，则可以看到全部的线程，否则，只能看到自己发起的线程（这是指，当前对应的MySQL帐户运行的线程）。 mysql> show processlist -> ; +----+-------+----------------------+------+---------+------+-------+------------------+ | Id | User  | Host                 | db   | Command | Time | State | Info             | +----+-------+----------------------+------+---------+------+-------+------------------+ | 34 | ucjmh | 192.168.56.1 ...继续阅读 (59)

mysql> create table users(num int not null, id varchar(30) not null, password varchar(30) not null, primary key(num)); Query OK, 0 rows affected (0.00 sec) mysql> insert into users values(1, 'admin', 'ad1234'); Query OK, 1 row affected (0.00 sec) mysql> insert into users values(2, 'wh1ant', 'wh1234'); Query OK, 1 row affected (0.00 sec) mysql> insert into users values(3, 'secuholic', 'se1234'); Query OK, 1 row affected (0.00 sec) mysql> select * from users where id=0; +-----+-----------+----------+ | num | id        | password | +-----+------- ...继续阅读 (47)

Which two are true regarding MySQL binary and text backups? A. Binary backups are usually faster than text backups. B. Binary backups are usually slower than text backups. C. Text backups are human-readable while binary backups are not. D. Binary backups are not portable across different operating systems.easy2hide start{reply_to_this=true}答案:ACeasy2hide end ...继续阅读 (90)

While reviewing the MySQL error log, you see occasions where MySQL has exceeded the number of file handles allowed to it by the operating system. Which method will reduce the number of file handles in use? A. Disconnecting idle localhost client sessions B. Implementing storage engine data compression options C. Relocating your data and log files to separate storage devices D. Activating the MySQL Enterprise thread pool plugineasy2hide start{reply_to_this=true}答案:Aeasy2hide end ...继续阅读 (74)

Which three data components are needed for point-in-time recovery? A. The error log B. The backup log C. The general query log D. Binary logs E. The data backup F. Configuration fileseasy2hide start{reply_to_this=true}答案:DEFeasy2hide end ...继续阅读 (37)

You need to dump the data from the master server and import it into a new slave server. Which mysqldump option can be used when dumping data from the master server in order to include the master server’s binary log information? A. Include-master-info B. Master-binlog C. Include-log-file D. Master-dataeasy2hide start{reply_to_this=true}答案:Deasy2hide end ...继续阅读 (47)

You have a server that has very limited memory but has a very large table. You will use mysqldump to back up this table. Which option will ensure mysqldump will process a row at a time instead of buffering a set of rows? A. — quick B. — skip-buffer C. — single-transaction D. — tabeasy2hide start{reply_to_this=true}答案:Aeasy2hide end ...继续阅读 (54)

Which three tasks can be performed by using the performance Schema? A. Finding queries that are not using indexes B. Finding rows that are locked by InnoDB C. Finding client connection attributes D. Finding the part of a code in which a single query is spending time E. Finding the size of each tableeasy2hide start{reply_to_this=true}答案:ABCeasy2hide end ...继续阅读 (57)

Which three statements are true about memory buffer allocation by a MySQL Server? A. Global buffers such as the InnoDB buffer pool are allocated after the server starts, and are never freed. B. Thread buffers are allocated when a client connects, and are freed when the client disconnects. C. Buffers that are needed for certain operation are allocated when the operation starts, and freed when it ends. D. User buffers are allocated at server startup and freed when the user is dropped. E. All dynamic buffers that are set with a SET GLOBAL statement immediately get allocated globally, and are ...继续阅读 (56)

Consider the following: Mysql> EXPLAIN SELECT * FROM City WHERE Name = ‘Jacksonville’ AND CountryCode = ‘USA’ \G ******************************** 1. row ******************************** Id: 1 Select_type: SIMPLE Table: City Type: ref Possible_keys: name_country_index Key: name_country_index Ref: const, const Rows: 1 Extra: Using where Which statement best describes the meaning of the value for the key_len column? A. It shows the total size of the index row. B. It shows how many columns in the index are examined. C. It shows the number of characters indexed in the key. D. It shows how many ...继续阅读 (53)

An employee cannot access the company database. You check the connection variables: Mysql> SHOW GLOBAL VARIABLES LIKE ‘%connect%’;8 rows in set (0.00 sec) A look at the user privileges shows: GRANT… TO ‘bob’@’%, example.com’ WITH MAX_USER_CONNECTIONS 0; GRANT… TO ‘key’@’%, example.com’ WITH MAX_USER_CONNECTIONS 1; GRANT… TO ‘joe’@’%, example.com’ WITH MAX_USER_CONNECTIONS 50; What is a valid explanation for why one of the users is unable to connect to the database? A. Bob has max_user_connections set to zero, which blocks all his connections B. Joe has exceeded the max_user_connections glo ...继续阅读 (69)

Your developers have created table to store some of their program’s data. After examining the slow Query Log, you see that they are using the LIKE operator and SUBSTER () functions against a VARCHAR (10000) column quite often. An example of the start of one row of data: ‘GREEN01020495888331993-12-10/2…’ What should you do to improve the overall performance? A. Convert the column to TEXT and add a fulltext index to the table. B. Create multiple prefix indexes of differing lengths. C. Convert their column to BINARY. D. Redesign the table so that the most commonly searched for string pattern ...继续阅读 (57)

Which statement is true about the log-output variable? —A. It is a static variable and can be set only at MySQL server startup. B. It enables and starts the General Query Log. C. It sets the target location for the binary logs generated by the MySQL sever. D. It specifies output destinations for the slow and General Query logs.easy2hide start{reply_to_this=true}答案:Deasy2hide end ...继续阅读 (51)

Which statement is true about the log-output variable? —A. It is a static variable and can be set only at MySQL server startup. B. It enables and starts the General Query Log. C. It sets the target location for the binary logs generated by the MySQL sever. D. It specifies output destinations for the slow and General Query logs.easy2hide start{reply_to_this=true}答案:Deasy2hide end ...继续阅读 (46)