db2top工具详解

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DB2性能工具简介

DB2性能工具简介

在数据库数据页损坏无法进行正常的数据操作时,可以通过db2dart进行数据恢复。当行,则可以在已损坏的表中用 db2dart命令进行数据导出,前提是数据库能连接上。 Db2dart dbname /ddel 然后按提示输入表id,表空间id,起始页,导出页数 Filename used for output data file is TS2T10.DEL. If existing file, data will be appended to it. Formatted data being dumped ... Dumping Page 0 .... Dumping Page 1 .... Table object data formatting end. 导出的数据就在TS2T10.DEL中,以文本形式保存。 由于db2dart命令不需要通过db2数据库管理器进行对数据库的访问,而是直接从磁盘 中读取数据的数据,因此,就算是数据表无法访问,也能进行数据的导出。不过当数 据量大时速度会十分慢。
db2dart 当数据库出现问题的时候,可以用db2dart进行检查,验证数据库以及相关数据库对象是 否正确 db2dart dbname /db Table inspection start: UCAR.TABLE4 Data inspection phase start. Data obj: 7 In pool: 2 Data inspection phase end. Index inspection phase start. Index obj: 7 In pool: 2 Scanning pages for unique index itoken(0) root page:385p. Scanning pages for unique index itoken(1) root page:386p. Index inspection phase end. Table inspection end. ......... Database inspection phase end. ______________________________________ The requested DB2DART processing has completed successfully! All operation completed without error; no problems were detected in the database. ______________________________________ Complete DB2DART report found in: PRODDB.RPT

数据库中top的用法

数据库中top的用法

数据库中top的用法一、简介在数据库中,我们经常会遇到需要查询出排名靠前的数据的情况。

这时,就可以使用数据库中提供的TOP关键字来实现此目的。

TOP关键字用于限制查询结果集返回的记录数,只返回排名最靠前(或最靠后)的若干条数据。

在这篇文章中,我将详细介绍数据库中TOP关键字的用法。

二、基本语法在 SQL 中,不同数据库管理系统(DBMS)对于 TOP 关键字有不同的实现方式。

下面是几个常见 DBMS 中 TOP 的基本语法:1. MySQL: 使用 LIMIT 子句来实现 TOP 功能。

SELECT * FROM table_name LIMIT n;2. Oracle: 使用 ROWNUM 来筛选 TOP 记录。

SELECT * FROM (SELECT * FROM table_name ORDER BY column_name) WHERE ROWNUM <= n;3. Microsoft SQL Server: 使用 TOP 关键字来获取 TOP 记录。

SELECT TOP n * FROM table_name;三、示例应用下面将通过具体示例来展示如何使用 TOP 关键字来获取数据库中排名靠前的数据。

1. MySQL 示例:假设我们有一个学生成绩表格,表格结构如下:```sqlCREATE TABLE student_scores (id INT,name VARCHAR(50),score INT);```我们想要查询成绩排名前五名的学生记录,可以使用以下 SQL 语句:```sqlSELECT * FROM student_scores ORDER BY score DESC LIMIT 5;```这将返回成绩排名前五名的学生记录。

2. Oracle 示例:我们仍然使用上述的学生成绩表格,在 Oracle 中,可以使用 ROWNUM 关键字来获取 TOP 记录。

以下是实现查询成绩排名前五名的 SQL 语句:```sqlSELECT *FROM (SELECT * FROM student_scores ORDER BY score DESC)WHERE ROWNUM <= 5;```3. Microsoft SQL Server 示例:我们继续使用上述学生成绩表格,下面是在 Microsoft SQL Server 中查询成绩排名前五名的 SQL 语句:```sqlSELECT TOP 5 * FROM student_scores ORDER BY score DESC;```四、注意事项在使用 TOP 关键字时,需要注意以下几点:1. 排序方式:TOP 关键字结合 ORDER BY 子句使用时,可以根据指定的列进行排序。

db2look语法

db2look语法

db2look语法摘要:1.DB2look简介2.DB2look的基本语法3.DB2look命令的分类与使用4.DB2look实用案例分享5.小结与建议正文:DB2look是一款用于IBM DB2数据库管理和查询的实用工具,它可以帮助数据库管理员(DBA)和开发人员更加方便地操作和维护数据库。

本文将介绍DB2look的基本语法、命令分类与使用,并通过实用案例分享,帮助大家更好地掌握DB2look的使用技巧。

一、DB2look简介DB2look是一款免费、开源的DB2管理工具,支持Windows、Linux和Mac OS等操作系统。

它提供了丰富的功能,包括数据库对象浏览、查询、数据Export/Import、SQL脚本编辑与执行等。

DB2look以其简洁的界面、强大的功能和易用性,受到了广大数据库从业者的喜爱。

二、DB2look的基本语法DB2look的使用遵循SQL语法,同时它还支持一些特定的关键字和命令。

在使用DB2look时,需要熟悉以下基本语法:1.数据库连接:使用`CONNECT TO`命令连接到数据库,需要提供数据库服务器地址、端口、用户名和密码等信息。

2.数据库对象浏览:使用`SELECT`命令查看数据库中的表、视图、索引等对象。

3.查询与数据操作:使用SQL查询语句对数据库进行查询、插入、更新和删除等操作。

4.数据导出与导入:使用`EXPORT TO`和`IMPORT FROM`命令将数据导出到文件或从文件导入到数据库。

5.SQL脚本编辑与执行:使用`EDIT`和`RUN`命令编辑和执行SQL脚本。

三、DB2look命令的分类与使用1.连接与认证相关命令:包括`CONNECT TO`、`DISCONNECT FROM`、`SET PASSWORD`等命令。

2.数据库对象管理:包括`SELECT`、`USE`、`DROP`、`CREATE`等命令,用于管理表、视图、索引等数据库对象。

DB2 性能调优入门(1-Tools)

DB2 性能调优入门(1-Tools)

DB2 snapshot switches on
当前挂起的锁定 =0 锁定等待 =0 数据库等待锁定时间(毫秒) = 0 在使用的锁定列表内存(以字节计)= 3360 检测到死锁 =0 锁定升级 =0 互斥锁定升级 =0 当前正等待锁定的代理程序数 = 0 锁定超时 =0 不确定事务数 =0
已分配的专用排序堆总数 =0 已分配的共享排序堆总数 =4 共享排序堆高水位标记 =4 后阈值排序(共享内存) =0 总计排序 =0 总计排序时间(毫秒) =0 排序溢出 =0 活动排序数 =0
RESET MONITOR {ALL [DCS] | FOR [DCS] DATABASE databasealias} [AT DBPARTITIONNUM db-partition-number | GLOBAL]
© 2007 IBM Corporation
DB2 9.5 Administration for the Oracle DBA – Proof of Technology – Part 1
© 2007 IBM Corporation
DB2 9.5 Administration for the Oracle DBA – Proof of Technology – Part 1
DB2 Information Management
学习目标 了解DB2日常监控的过程 熟悉DB2常用的监控工具 能够熟练使用snapshot工具 能够熟练使用event monitor工具 能够熟练使用db2pd工具 能够使用SQL访问监控结果 能够熟练使用recovery expert工具
UPDATE MONITOR SWITCHES USING {switch-name {ON | OFF} ...} [AT DBPARTITIONNUM db-partition-number | GLOBAL]

db2top工具详解(翻译)

db2top工具详解(翻译)

Database (d)Figure 2. Database screen在数据库屏幕,db2top提供了一组对整个数据库的性能监控单元。

用户可以监视活动会话(MaxActSess),排序存(SortMemory)和日志空间(LogUsed)。

这些监测元素可以帮助用户确定这些元素的当前使用百分比。

如果这些因素中的一个开始达到很高甚至100%时,用户应该开始调查发生了什么事。

当前时间和数据库开始时间(Start Time)相比能让我们了解数据库运行了多久。

这个值结合其他检测元素去调查那些已存在一段时间的问题是非常有用的。

锁的使用(LockUsed)和升级(LockEscals)对缩小锁定问题非常有帮助。

如果LockEscals数量很大时,则增加LOCKLIST和MAXLOCKS数据库参数是一个好主意或者寻找那些引起这个问题的不良查询语句。

L_Reads,P_Reads和A_Reads代表逻辑读,物理读和异步读取。

结合的命中率(HitRatio)值,这些变量对于评估大多数的读取发生在存储器中还是磁盘I / O里是非常重要的。

因为磁盘的I / O比存储器存取慢得多,用户更喜欢访问在存中的数据。

当用户看到HitRatio下降低则可以查看缓冲池(bufferpools)是不是不够大了,或是不是有查询进行了太多的全白扫描而导致页面数据从存洗冲到磁盘。

和读类似,A_Writes代表异步写入,这表明数据页是由异步页清洁剂之前写的缓冲池空间是必需的。

通过db2top 刷新频率这段时间的写数量我们还能知道有多少写请求发生了。

还能计算每次写入的平均花费时间这对分析I/O瓶颈引起的一些性能问题有所帮助。

当A_Writes/Writes的比值越高则写I/O性能越高。

SortOvf代表排序溢出。

如果用户发现这个数字变为非常高,就需要寻找查询了。

排序溢出发生在SORTHEAP不足够大,导致排序(Sort)或HashJoin操作可能会溢出数据到临时空间。

db2top

db2top

DB2TOP(1) User Manuals DB2TOP(1)NAMEdb2top − DB2 performance monitorSYNOPSISdb2top [−d dbname] [−n nodename] [−u username] [−p passÂ-word] [−V schema] [−i interval] [−P<partition> ] [−boption] [−a] [−B] [−k] [−R] [−x] [−f file</HH:MM:SS><+offset> ] [−D delimiter] [−C<option>] [−m duration] [−ooutfile]db2top [−H host ] [−N port ] [−h]DESCRIPTIONdb2top is a monitor for DB2 UDB specifically designed for DPF environments. It provides a unified, ’single system view’ of a multi−partition DB2 database that can be used to quickly identify either partition−specific or global problems in the system.The user interface is character−based and built using the curses library and is similar in nature to many UNIX moniÂ- toring utilities.db2top uses the DB2 snapshot monitoring APIs to retrieve data. It uses both global as well as partition−specific monitoring information to provide aggregation as well as quick drill−down capabilities.It can be run interactively or in batch mode. Main feaÂ- tures can be selected by an interactive command or by specifying the option in the personal or system−wide conÂ- figuration file. See below .db2toprc for more information.COMMAND OPTIONS−n specifies the node to attach to.−d specifies the database to monitor.−u specifies the DB2 username used to access the database.−p specifies the DB2 password.−V specifies the default schema used in explains.−i specifies the delay between screen updates.−k specifies whether to display actual or delta values.−R Reset snapshot at startup.−P <number>. Snapshot issued on current or partition numÂ-ber.−x specifies whether to display additionnal counters on session snd appl creens (might run slower on session).−b tells db2top to run in background mode.−a specifies only active queries will be displayed.−B enable bold for active objects.−C Runs db2top in snapshot collector mode, raw snapshot data is saved in <db2snap−Machine>.bin> by default (unless −f is specified).−f <file> </HH:MM:SS> <+offset>. Run db2top in replay mode when snapshot data has been previously collected in <file>. offset will jump to a certain point in time in the file. It can be expressed in seconds (+10s), minutes (+10m) or hours (+10h). /HH:MM:SS will skip entries until the specified point in time.−m Will limit duration of db2top in minutes for −b and −C.−o <outfile>. Outfile for −b option.−D <delimiter>. Separator for −b option.−h short help. When using the −b option, db2top will display information in CSV format. db2top can be run in background mode in combination with reading snapshot data from collection file, in this case, use the −f <file> option. Valid sub− options for −b and −C are :d : databasel : sessionst : tablespacesb : bufferpoolsT : TablesD : Dynamic SQLs : StatementsU : Locksu : UtilitiesF : Federationm : Memory poolsWhen using the −X switch with the −b option, the output will be displayed in XML format. When using the −L switch with the −b option, in session mode (sub−option l), all queries will be written to ’ALL.sql’. When using the −A switch with the −b option, db2top will produce a top twenty performance report. When using the −s <sample> switch with the −b option, db2top will only display n samÂ-ples and exit.Interactive commandsd Goto database screen.l Goto sessions screen.a Goto application details for agent (or restrict on agent on statement screen). db2top will prompt for the agent−id.G Toggle between all partitions and current partitions.P Select db partition on which to issue snapshot.t Goto tablespaces screen.T Goto tables screen.b Goto bufferpools screen.D Goto the dynamic SQL screen.m Display memory pools.s Goto the statements screen.U Goto the locks screen.p Goto the partitions screen.u Goto the utilities screen.A Goto the HADR screen.F Goto the federation screen.B Goto the bottleneck analysis screen.H Goto the history screen (experimental).f Freeze screen.W Watch mode for agent_id, os_user, db_user, applicaÂ-^HÂ-tion or netname. Statements returned by the sessionsnapshot (option l) will be written to agent.sql, os_user−agent.sql, db_user−agent.sql, application−agent.sql or netname−agent.sql. The Dump DB Structfield will create scripts in the current directory torecreate the database. When issued from the dynamicSQL screen (option D), statements will be written to db2adv.sql in a format compatible with db2advis./ Enter expression to filter data. \Expression mustconform to regular expression. Each function (screen)can be filtered differently. regexp check is applyiedto the whole row.<|> Move to left or right of screen.z|Z Sort on ascending or descending order.c This option allows to change the order of the columnsdisplayed on the screen. The syntax is in the form:1,2,3,... where 1,2,3 correspond respectively to the1st, 2nd and 3rd columns displayed. These are thecolumn numbers to use when specifying a sort criteÂ-ria.S Run native DB2 snapshot.L Allows to display the complete query text from the SQL screen. Regular DB2 explain can then be run usinge or X.R Reset snapshot data.i Toggle idle sessions on/off.I Reset refresh interval.k Toggle actual vs delta values.g Toggle graph on/off.X Toggle extended mode on/off.C Toggle snapshot data collector on/off.V Set default explains schema.O Display session setup.w Write session settings to .db2toprc.q Quit db2top.Interactive commands(applications screen only)r Return to previous function.R Toggle automatic refresh.g Toggle graph on/off.X Toggle extended mode on/off.d Display agents.Snapshot data collectordb2top can be run in replay mode, which means it can be run against a saved copy of the raw binary snapshot data. In order to do so, db2top must be run first in data colÂ- lector mode, either in batch mode by running db2top from the command line with the [−C] switch, or by activatÂ- ing/deactivating data collection from an interactive sesÂ- sion by pressing C. This will create a file <db2snap−Machine> in the current directory. Afterwards, db2top can be ran against <db2snap−Machine> by using the [−f <db2snap−Machine> arguments. db2top does not need to attach to DB2 in replay mode, which makes convenient to do remote monitoring. It is possible to limit the content of the stream file (and it’s size) by specifying any of the suboptions dltbTDsUF.Network data collector(EXPERIMENTAL)db2top can be run in client/server mode. This means that one instance of db2top can issue DB2 snapshots in data collection mode and send the output stream via the network to other instances of db2top. To enable this, db2top needs to be started in collection mode with −C and −N (network). Eventually, the −D will set db2top to daemon mode; in this case, messages are sent to syslog(3). Then, other instances of db2top will connect to the server using the −H [host] and −N <port> switchs.Network commands−−stop, −−restart,−−ping.FILESdb2toprc.db2toprc is a configuration file used to setup parameters at initialization time. db2top will search for the location of .db2toprc using the environement variable $DB2TOPRC. If the variable is not set, db2top will then search for .db2toprc in the current directory and finally in the home directory.ENVIRONMENTDB2TOPRCsee above.DB2DBDFTIf non null and nothing has been specified on the command line or in .db2toprc, db2top will honor the DB2DBDFT registry variable content as the default database.EDITORif EDITOR is set, results of explain or native snapshots will be displayed using this command, otherwise, it will default to vi(1).db2toprc structureSectionsThe various sections of $DB2TOPRC are described here after.cpu=commandThis entry allows the user to specify a comÂ- mand which result will be displayed on the 2nd line at the right of the screen, for example:cpu=vmstat 2 2 | tail −1 | awk’{printf("%d(usr+sys)",$14+$15);}’will display ’Cpu=2(usr+sys)’ on the right ofthe screen.io=commandThis entry allows the user to specify a comÂ-mand which result will be displayed on the 2ndline at the left of the screen, for example:io=vmstat 2 2 | tail −1 | awk’{printf("%d(bi+bo)",$10+$11);}’will display ’Disk=76(bi+bo)’ on the right ofthe screen.Both commands are run in a background process andthe fields on the screen are updated asynÂ-chronously.shell alias=commandThe shell entry allows to specify a userdefined command, for example:shell M=topwill spawn top from a db2top session whenentering M. It will return to the currentscreen upon exit.function alias=commandThe function entry allows to specify a userdefined command, for example:function N=netstatwill create a new function called N that willdisplay repeteadly the output of netstat.Sample.db2toprc file## db2top configuration file# On unix, should be located in $HOME/.db2toprc# File generated by db2top−1.0h#node= # [−n] nodenamedatabase=sample # [−d] databasenameuser= # [−u] database userpassword= # [−p] user password (crypted )schema= # [−V] default schema for exp lainsinterval=2 # [−i] sampling intervalactive=OFF # [−a] display active session s only (on/off)reset=OFF # [−R] Reset snapshot at star tup (on/off)delta=ON # [−k] Toggle display of delt a/cumulative values (on/off)graphic=ON # True if terminal suppo rts semi graphical characterscolors=ON # True if terminal suppo rts colorsgraph=ON # display graph on sessi ons list (on/off)port= # Port for network colle ctionstreamsize=size # Max collection size pe r hour (eg. 1024 or 1K : K, M or G)# Command to get cpu usage information from OScpu=vmstat 2 2 | tail −1 | awk ’{printf("%d(usr+sys)0,$14+$15 );}’# Command to get IO usage information from OSio=vmstat 2 2 | tail −1 | awk ’{printf("%d(bi+bo)0,$10+$11);}’# Ordering of information in sessions screensessions=0,1,18,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,19,20 ,21,22,23tables=0,1,2,4,3,5,6,7tablespaces=0,1,18,2,3,4,5,6,7,8bufferpools=0,1,18,2,3,4,5,6,7,8,9,10dynsql=0,1,18,2,3,4,5,6,7,8,9statements=0,1locks=0,1utilities=0federation=0,2,4# User defined commandsshell P=topfunction N=date && netstat −t tcpThe columns order screenAfter pressing c, a screen will be shown specifying theorder of the columns displayed on screen. The left partof the sceen displays the default order and column numberswhereas the right part displays the current ordering. Tochange the order of the columns, enter in the text fieldat the bottom of the screen the new column order : enterthe relative column positions as displayed on the leftseperated by comma. Not all columns need to be specified.This column ordering can be saved in $DB2TOPRC for subseÂ-quent db2top sessions by pressing w. It is possibile todefine the default sort order for this function by usingthe sort=num<a|d> syntax, where num is the column numberand <a|d> means ascending or descending.Example : tablespaces=0,1,18,2,3,4,5,6,7,8,sort=22aValid keywords for column ordering in db2toprc.sessions=tablespaces=tables=bufferpools=dynsql=statements=locks=utilities=federation=BUGSOccasionally strange information may appear when the snapÂ-shot API returns unexpected very large values. db2top willtry to display * instead of these values.COPYRIGHT Licensed Materials − Property of IBM Copyright IBM Corp. 2005 All Rights Reserved. US Government Users Restricted Rights Use, duplication or disclosure restricted by GSA ADP Schedule Contract wi th IBM Corp.IBM/DB2 JANUARY 2005 DB2TOP(1)Nov 10, 06 22:48Page 7/7db2top Printed by db2inst2。

db2常用命令(详解)大全

db2常用命令(详解)大全

db2常⽤命令(详解)⼤全近⼀年来在项⽬开发中使⽤到了IBM的DB2 9.1的数据库产品,跟Oracle相⽐⼀些命令有很⼤的区别,⽽它最⼤的功能是⽀持xml存储、检索机制,通过XPath进⾏解析操作,使开发⼈员免于对xml⽂件在应⽤进⾏解析处理,先对其常⽤命令进⾏⼀下汇总,以免遗忘。

注意:在执⾏如下命令时,需要⾸先安装db2客户端并通过在运⾏中输⼊db2cmd进⾏初始化⼀、基础篇1、db2 connect to <数据库名> --连接到本地数据库名db2 connect to <数据库名> user <⽤户名> using <密码> --连接到远端数据库2、 db2 force application all --强迫所有应⽤断开数据库连接3、db2 backup db db2name<数据库名称> --备份整个数据库数据db2 restore db <db2name> --还原数据库4、db2 list application --查看所有连接(需要连接到具体数据库才能查看)5、db2start --启动数据库db2stop --停⽌数据库6、create database <数据库名> using codeset utf-8 territory CN--创建数据库使⽤utf-8编码7、db2 catalog 命令db2 catalog tcpip node <接点名称> remote <远程数据库地址> server <端⼝号>--把远程数据库映射到本地接点⼀般为50000db2 catalog db <远程数据库名称> as <接点名称> at node PUB11--远程数据库名称到本地接点db2 CONNECT TO <接点名称> user <⽤户名> using <密码>--连接本地接点访问远程数据库8、数据库导出db2look -d <数据库名> -u <⽤户> -e -o <脚本名称>.sql--导出数据库的表结构,其中⽤户空间⼀般为db2admin/db2inst1db2look -d <数据库名> -u <⽤户> -t <表1> <表2> -e -o <脚本名称>.sql--导出数据库中表1和表2的表结构db2move <数据库名> export --导出数据库数据db2move <数据库名> export -tn <表1>,<表2> --导出数据库中表和表数据 db2move dbname export;db2move dbname import db2move bipdbrun export -sn app -u app -p app9、数据库导⼊db2 -tvf <脚本名称>.sql --把上述导出的表结构导⼊到数据库表结构db2move <数据库名> load -lo replace --把上述“db2move <数据库名> export“导出的数据导⼊到数据库中并把相同的数据替换掉在实际使⽤过程中,如果⽤到db2⾃增主键,需要使⽤by default,⽽不是always,功能是⼀样的,但这样在数据移植时候会很⽅便!10、db2 connect reset 或 db2 terminate --断开与数据库的连接11、db2set db2codepage=1208 --修改页编码为120812、db2 describe table <表名> --查看表结构13、db2 list tables --查看数据库中所有表结构list tables for system --列出所有系统表14、db2 list tablespaces --列出表空间⼆、⾼级篇15、fetch first 10 rows only --列出表中前10条数据例如:select * from <表名> fetch first 10 rows only16、coalesce(字段名,转换后的值) --对是null的字段进⾏值转换例如:select coalesce(id,1) from <表名> --对表中id如果为null转换成117、dayofweek(⽇期) --计算出⽇期中是周⼏(1是周⽇,2是周⼀.......7是周六)dayofweek_iso --计算出⽇期中是周⼏(1是周⼀.......7是周⽇)例如:dayofweek(date(2008-01-16)) --它会返回是4,代表星期三dayofweek_iso(date(2008-01-16)) --它会返回是3,代表星期三18、dayofyear(⽇期) --⼀年中的第⼏天,范围在1-366范围之内注意:参数中⽇期的格式是YYYY-MM-DD的形式,如果不是需要进⾏转换,否则函数不能使⽤例如:⽇期是20080116必须要进⾏转换dayofweek(concat(concat(concat(substr(openDate,1,4),'-'),concat(substr(openDate,5,2),'-')),substr(openDate,7,2)))as week)这样格式正确的。

(转)Db2数据库性能优化中,十个共性问题及难点的处理经验

(转)Db2数据库性能优化中,十个共性问题及难点的处理经验

(转)Db2数据库性能优化中,⼗个共性问题及难点的处理经验为了帮助⼤家更好地进⾏DB2的性能优化,社区组织社区专家针对⼀些共性问题及难点分享经验。

以下内容来⾃活动“Db2数据库性能优化经验交流”,主要由以下社区专家及会员分享:leilin、topzgm、岳彩波、beyondmch、yellow-fin等提醒:⽂章末尾有彩蛋,如果你是Db2达⼈,可不要错过~01如何发现性能问题?通过什么定位?1、收集信息。

2、分析3、找到问题点解决第⼀步操作系统级别性能CPU监控:ps -elf | sort +5 -rn | more 第6列代表CPU使⽤的计数器I/O使⽤率:iostat -D 收集磁盘I/O信息内存占⽤率:讨论的内存指的是虚拟内存(virtual memory),包括物理内存(physical memory)与交换空间(swap space)vmstat -> avm 当前系统中已经激活的虚拟内存页的数量(该数值不包含⽂件系统缓存)vmstat -> fre 系统中平均空闲页的数量(不能完全代表系统中可⽤的空闲内存:⽂件系统缓存驻留内存,并不会返还给空闲列表,除⾮被虚拟内存管理器盗取)svmon -> clnt与in use交叉项代表有多少内存被⽂件系统使⽤(加上free项,可以初步认为是该系统中可以被应⽤程序所使⽤的内存)第⼆步数据库级别性能1. db2grep -dump | more 查看服务器安装了⼏个DB2版本2. ps -elf | grep db2inst1 查看数据库进程的CPU计数器3. db2 get dbm cfg | grep -i dft_mon 确认快照打开4. 实例级快照,了解当前实例有多少应⽤程序在执⾏db2 get snapshot for database manager -> Remote connections & Local connections5. 数据库级快照连接数信息:applications connected currently,appls executing in db manager currently锁信息:锁总数,锁等待数量,锁等待总时间,当前数据库锁列表占⽤内存,死锁次数,锁升级次数,锁超时次数排序信息:排序是CPU杀⼿,过多的排序会造成CPU的极⼤消耗;排序溢出是说,如果排序堆⽆法容纳排序数据,就会被溢出到临时空间;排序是⼀种状态,根源在SQL语句;数据索引I/O信息:逻辑读 DB2向缓冲池请求的次数逻辑读越多,需要的物理I/O就越少物理读如果请求的数据页不在缓冲池,需要从磁盘中读取数据页的次数吞吐量或事务信息:提交/回滚事务数,执⾏动态和静态语句次数,增删改查次数( rows read / rows selected ) 是⼀个⾮常重要的性能指标,它表⽰为了检索⼀⾏数据需要读取多少⾏,该值越⼤,表⽰代价越⾼,需要的I/O 越多,可调优的余地越⼤事务⽇志信息:⽇志I/O在很⼤程度上会影响数据库整体的性能6. 应⽤程序快照在数据库快照中发现存在⼤量的逻辑读,通过应⽤程序快照可以细化到某条特定的语句7. 表空间快照在数据库快照中发现存在⼤量的逻辑读,通过表空间快照可以轻松地定位哪个表空间被频繁使⽤8. 表快照如果发现⼀个表的页数很少,但是读的⾏数⾮常多,那么可以合理地猜测该表在某些查询语句中可能处于NLJOIN的内部⼦节点9. 动态SQL快照:SQL执⾏次数,总共读的⾏数,消耗的CPU,逻辑物理读数量,排序数量等第三步内存使⽤监控1. db2pd -osinfo系统内存使⽤情况2. db2pd -dbptnmem整个实例的内存使⽤情况3. db2pd -memsets内存段使⽤情况在实例中会有多个不同的内存段,每⼀个内存段中可能有⼀个或者多个内存池ipcs -a | grep 578814120 内存段映射到操作系统共享内存IPC段FMP与trace内存段很少造成性能问题4. db2pd -mempool深⼊内存池信息5. db2pd -db <dbname> -memsets / -mempool数据库级别内存段和内存池信息02优化过程中的优先级问题?在Db2优化过程中,我已知的有如下⼿段1.索引2.sql语句优化(分析执⾏语句后重写sql)3.runstats信息收集请问优化过程中,⼊⼿的优先级顺序是什么呢,还有其他⼿段吗?这“三板斧”已经可以解决很多问题了,DB2的优化⼿段很多,如果想深⼊了解,上传⼏个⽂件供参考。

DB2数据库的操作命令总结

DB2数据库的操作命令总结

DB2数据库的操作命令总结DB2是IBM公司开发的一种关系型数据库管理系统,它支持SQL标准,并且提供了扩展功能。

DB2数据库的操作命令主要包括数据库的创建、备份与恢复、数据的增删改查、用户管理等。

下面是对DB2数据库操作命令的总结:1.创建数据库:- CREATE DATABASE db_name:创建一个新的数据库。

- ATTACH TO DATABASE db_name USER user_name USING password:连接到数据库。

2.备份与恢复:- BACKUP DATABASE db_name TO backup_path:备份数据库。

- RESTORE DATABASE db_name FROM backup_path:恢复数据库。

3.数据的增删改查:- INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...):向表中插入新的数据。

- DELETE FROM table_name WHERE condition:从表中删除满足条件的数据。

- UPDATE table_name SET column1 = value1, column2 =value2, ... WHERE condition:更新表中满足条件的数据。

- SELECT column1, column2, ... FROM table_name WHERE condition:从表中查询满足条件的数据。

4.表的创建与删除:- CREATE TABLE table_name (column1 data_type, column2data_type, ...):创建一个新的表。

- DROP TABLE table_name:删除表。

5.索引的创建与删除:- CREATE INDEX index_name ON table_name (column1,column2, ...):创建索引。

DB2(常用工具)具体实用

DB2(常用工具)具体实用

题目:1、熟练使用db2look工具导出数据库结构2、使用db2pd监控表空间、锁的使用情况3、使用db2mtrk 检查数据库内存的分配情况4、练习使用db2top工具5、使用db2batch测试SQL语句的性能解答:1、熟练使用db2look工具导出数据库结构[myinst@ye ~]$ db2look -d mydb3 -l -e -o mydb3.dll-- No userid was specified, db2look tries to use Environment variable USER-- USER is: MYINST-- Creating DDL for table(s)-- Output is sent to file: mydb3.dll-- Binding package automatically ...-- Bind is successful-- Binding package automatically ...-- Bind is successful2、使用db2pd监控表空间、锁的使用情况#db2pd监控表空间[myinst@ye ~]$ db2pd -db mydb3 -tablespaceDatabase Member 0 -- Database MYDB3 -- Active -- Up 0 days 00:29:31 -- Date2015-08-24-11.36.10.344000Tablespace Configuration:Address Id Type Content PageSz ExtentSz Auto Prefetch BufID BufIDDisk FSC NumCntrs MaxStripe LastConsecPg RSE Name0x00007F9AC71E0080 0 DMS Regular 32768 4 Yes 4 1 1 Off 1 0 3 Yes SYSCATSPACE0x00007F9AC71ED220 1 SMS SysTmp 32768 32 Yes 32 1 1 On 1 0 31 No TEMPSPACE10x00007F9AC71FA3C0 2 DMS Large 32768 32 Yes 32 1 1 Off 1 0 31 Yes USERSPACE10x00007F9AC7207560 3 DMS Large 32768 4 Yes 4 1 1 Off 1 0 3 Yes SYSTOOLSPACE0x00007F9AC7214700 4 DMS Large 32768 32 Yes 32 2 2 Off 1 0 31 Yes MYSPACE3Tablespace Statistics:Address Id TotalPgs UsablePgs UsedPgs PndFreePgs FreePgs HWMMax HWM State MinRecTime NQuiescers PathsDropped TrackmodState0x00007F9AC71E0080 0 7168 7164 6880 0 284 68806880 0x00000000 0 0 No n/a0x00007F9AC71ED220 1 1 1 1 0 0 - - 0x00000000 0 0 No n/a0x00007F9AC71FA3C0 2 1024 992 96 0 896 9696 0x00000000 0 0 No n/a0x00007F9AC7207560 3 1024 1020 80 0 940 8080 0x00000000 0 0 No n/a0x00007F9AC7214700 4 1024 992 352 0 640 352352 0x00000000 1439886641 0 No n/aTablespace Autoresize Statistics:Address Id AS AR InitSize IncSize IIP MaxSize LastResize LRF0x00007F9AC71E0080 0 Yes Yes 33554432 -1 No None None No0x00007F9AC71ED220 1 Yes No 0 0 No 0 None No0x00007F9AC71FA3C0 2 Yes Yes 33554432 -1 No None None No0x00007F9AC7207560 3 Yes Yes 33554432 -1 No None None No0x00007F9AC7214700 4 Yes Yes 33554432 -1 No None None NoTablespace Storage Statistics:Address Id DataTag Rebalance SGID SourceSGID0x00007F9AC71E0080 0 0 No 0 -0x00007F9AC71ED220 1 0 No 0 -0x00007F9AC71FA3C0 2 -1 No 0 -0x00007F9AC7207560 3 -1 No 0 -0x00007F9AC7214700 4 -1 No 0 -Containers:Address TspId ContainNum Type TotalPgs UseablePgs PathID StripeSetContainer0x00007F9AC1270580 0 0 File 7168 7164 0 0/www/db2/db2test/myinst/NODE0000/MYDB3/T0000000/C0000000.CAT0x00007F9AC1270C60 1 0 Path 1 1 0 0/www/db2/db2test/myinst/NODE0000/MYDB3/T0000001/C0000000.TMP0x00007F9AC1268A20 2 0 File 1024 992 0 0/www/db2/db2test/myinst/NODE0000/MYDB3/T0000002/C0000000.LRG0x00007F9AC1269A00 3 0 File 1024 1020 0 0/www/db2/db2test/myinst/NODE0000/MYDB3/T0000003/C0000000.LRG0x00007F9AC126AA00 4 0 File 1024 992 0 0/www/db2/db2test/myinst/NODE0000/MYDB3/T0000004/C0000000.LRG#db2pd监控锁的使用情况[myinst@ye ~]$ db2pd -db mydb3 -lockDatabase Member 0 -- Database MYDB3 -- Active -- Up 0 days 00:23:26 -- Date2015-08-24-11.30.05.926325Locks:Address TranHdl Lockname Type Mode Sts Owner Dur HoldCount Att ReleaseFlg rrIID3、使用db2mtrk 检查数据库内存的分配情况#显示数据库的内存分配情况的详细信息[myinst@ye ~]$ db2mtrk -d -vTracking Memory on: 2015/08/24 at 12:12:36Memory for database: MYDB3Backup/Restore/Util Heap is of size 262144 bytesPackage Cache is of size 2293760 bytesOther Memory is of size 196608 bytesCatalog Cache Heap is of size 720896 bytesBuffer Pool Heap (2) is of size 34078720 bytesBuffer Pool Heap (1) is of size 75300864 bytesBuffer Pool Heap (System 32k buffer pool) is of size 1835008 bytesBuffer Pool Heap (System 16k buffer pool) is of size 1572864 bytesBuffer Pool Heap (System 8k buffer pool) is of size 1441792 bytesBuffer Pool Heap (System 4k buffer pool) is of size 1376256 bytesShared Sort Heap is of size 1310720 bytesLock Manager Heap is of size 53936128 bytesDatabase Heap is of size 107085824 bytesApplication Heap (15) is of size 65536 bytesApplication Heap (14) is of size 65536 bytesApplication Heap (13) is of size 65536 bytesApplication Heap (12) is of size 196608 bytesApplication Heap (11) is of size 65536 bytesApplication Heap (10) is of size 65536 bytesApplication Heap (9) is of size 131072 bytesApplication Heap (8) is of size 131072 bytesApplications Shared Heap is of size 917504 bytesTotal: 283115520 bytes#显示数据库的内存使用情况[myinst@ye ~]$ db2mtrk -dTracking Memory on: 2015/08/24 at 12:14:16Memory for database: MYDB3utilh pckcacheh other catcacheh bph (2) bph (1) 256.0K 2.2M 192.0K 704.0K 32.5M 71.8Mbph (S32K) bph (S16K) bph (S8K) bph (S4K) shsorth lockh 1.8M 1.5M 1.4M 1.3M 1.2M 51.4Mdbh apph (15) apph (14) apph (13) apph (12) apph (11) 102.1M 64.0K 64.0K 64.0K 192.0K 64.0Kapph (10) apph (9) apph (8) appshrh64.0K 128.0K 128.0K 896.0K#显示当前实例的内存使用情况[myinst@ye ~]$ db2mtrk -iTracking Memory on: 2015/08/24 at 12:15:10Memory for instanceother fcmbp monh51.2M 832.0K 512.0K#显示当前实例的内存使用的详细信息[myinst@ye ~]$ db2mtrk -i -vTracking Memory on: 2015/08/24 at 12:15:18Memory for instanceOther Memory is of size 53739520 bytesFCMBP Heap is of size 851968 bytesDatabase Monitor Heap is of size 524288 bytesTotal: 55115776 bytes4、练习使用db2top工具[myinst@ye ~]$ db2top -d mydb3按快捷键“d”,转至数据库屏幕按快捷键“D”,转至动态SQL 屏幕按快捷键“u”,显示活动的实用程序,并且跨数据库分区将它们聚集起来按快捷键“l”,转至会话屏幕按快捷键“t”,转至表空间屏幕5、使用db2batch测试SQL语句的性能[myinst@ye ~]$ cat sample.sqlselect * from mydb3.emp;[myinst@ye ~]$ db2batch -d mydb3 -f sample.sql* Timestamp: Mon Aug 24 2015 13:53:24 CST---------------------------------------------* SQL Statement Number 1:select * from mydb3.emp;** CLI error in preparing the SQL statement:(-204): [IBM][CLI Driver][DB2/LINUXX8664] SQL0204N "MYDB3.EMP" is an undefined name. SQLSTATE=42704* Elapsed Time is: 0.000000 seconds* Summary Table:Type Number Repetitions Total Time (s) Min Time (s) Max Time (s) Arithmetic Mean Geometric Mean Row(s) Fetched Row(s) Output--------- ----------- ----------- -------------- -------------- -------------- --------------- -------------- -------------- -------------Statement 1 1 0.000000 0.000000 0.000000 0.000000 0.000000 0 0* Total Entries: 1* Total Time: 0.000000 seconds* Minimum Time: 0.000000 seconds* Maximum Time: 0.000000 seconds* Arithmetic Mean Time: 0.000000 seconds* Geometric Mean Time: 0.000000 seconds---------------------------------------------* Timestamp: Mon Aug 24 2015 13:53:24 CST#获得更多信息[myinst@ye ~]$ db2batch -d mydb3 -f sample.sql -o r 0 p 2* Timestamp: Mon Aug 24 2015 13:54:30 CST---------------------------------------------* SQL Statement Number 1:select * from mydb3.emp;** CLI error in preparing the SQL statement:(-204): [IBM][CLI Driver][DB2/LINUXX8664] SQL0204N "MYDB3.EMP" is an undefined name. SQLSTATE=42704* Elapsed Time is: 0.000000 secondsMonitoring InformationInstance name = myinstNode name =Node type = Enterprise Server Edition with local and remote clientsSnapshot timestamp = 08/24/2015 13:54:30.306349Application SnapshotApplication handle = 229Application status = UOW WaitingStatus change time = 08/24/2015 13:54:30.301560Application code page = 1208Application country/region code = 1DUOW correlation token = *LOCAL.myinst.150824055430 Application name = db2batchApplication ID = *LOCAL.myinst.150824055430Sequence number = 00002TP Monitor client user ID =TP Monitor client workstation name = TP Monitor client application name = DB2BATCHTP Monitor client accounting string =CONNECT Authorization ID = MYINSTClient login ID = myinstConfiguration NNAME of client = Client database manager product ID = SQL10055Process ID of client application = 7007Platform of client application = LINUXAMD64Communication protocol of client = Local ClientDatabase name = MYDB3Database path = /www/db2/db2test/myinst/NODE0000/SQL00001/MEMBER0000/Client database alias = MYDB3Input database alias =The highest authority level granted =Direct DBADM authorityDirect SECADM authorityIndirect SYSADM authorityIndirect CREATETAB authorityIndirect BINDADD authorityIndirect CONNECT authorityIndirect IMPLICIT_SCHEMA authorityCoordinator member number = 0Coordinator agent process or thread ID = 56Agents associated with the application = 1Connection request start timestamp = 08/24/2015 13:54:30.292632Connect request completion timestamp = 08/24/2015 13:54:30.293070Application idle time = 0Inbound communication address = *LOCAL.myinstLast reset timestamp = 08/24/2015 13:54:30.300279Agents stolen = 0Agents waiting on locks = 0Maximum associated agents = 1Priority at which application agents work = 0Priority type = DynamicLocks held by application = 0Lock waits since connect = 0Time application waited on locks (ms) = 0 Deadlocks detected = 0 Lock escalations = 0 Exclusive lock escalations = 0 Number of Lock Timeouts since connected = 0 Total time UOW waited on locks (ms) = 0Total sorts = 0 Total sort time (ms) = 0 Total sort overflows = 0Buffer pool data logical reads = 0 Buffer pool data physical reads = 0 Buffer pool temporary data logical reads = 0 Buffer pool temporary data physical reads = 0 Buffer pool data writes = 0 Buffer pool index logical reads = 1 Buffer pool index physical reads = 0 Buffer pool temporary index logical reads = 0 Buffer pool temporary index physical reads = 0 Buffer pool index writes = 0 Buffer pool xda logical reads = 0 Buffer pool xda physical reads = 0 Buffer pool temporary xda logical reads = 0 Buffer pool temporary xda physical reads = 0 Buffer pool xda writes = 0 Total buffer pool read time (milliseconds) = 0Total buffer pool write time (milliseconds)= 0Time waited for prefetch (ms) = 0 Unread prefetch pages = 0 Direct reads = 0 Direct writes = 0 Direct read requests = 0 Direct write requests = 0 Direct reads elapsed time (ms) = 0 Direct write elapsed time (ms) = 0Number of SQL requests since last commit = 0 Commit statements = 1 Rollback statements = 0 Dynamic SQL statements attempted = 0 Static SQL statements attempted = 1 Failed statement operations = 0 Select SQL statements executed = 0Xquery statements executed = 0Update/Insert/Delete statements executed = 0DDL statements executed = 0Internal automatic rebinds = 0Internal rows deleted = 0Internal rows inserted = 0Internal rows updated = 0Internal commits = 0Internal rollbacks = 0Internal rollbacks due to deadlock = 0Binds/precompiles attempted = 0Rows deleted = 0Rows inserted = 0Rows updated = 0Rows selected = 0Rows read = 0Rows written = 0UOW log space used (Bytes) = 0Previous UOW completion timestamp = 08/24/2015 13:54:30.293070 Elapsed time of last completed uow (sec.ms)= 0.005268UOW start timestamp = 08/24/2015 13:54:30.296285 UOW stop timestamp = 08/24/2015 13:54:30.301553 UOW completion status = Committed - Commit StatementOpen remote cursors = 0Open remote cursors with blocking = 0Rejected Block Remote Cursor requests = 0Accepted Block Remote Cursor requests = 1Open local cursors = 0Open local cursors with blocking = 0Total User CPU Time used by agent (s) = 0.001037Total System CPU Time used by agent (s) = 0.000000Host execution elapsed time = 0.000845Package cache lookups = 1Package cache inserts = 0Application section lookups = 1Application section inserts = 0Catalog cache lookups = 1Catalog cache inserts = 0Catalog cache overflows = 0Catalog cache heap full = 0Catalog cache high water mark = 0Number of hash joins = 0Number of hash loops = 0Number of hash join overflows = 0Number of small hash join overflows = 0Statement type = Static SQL Statement Statement = Static CommitSection number = 0Application creator =Package name =Consistency Token =Cursor name =Statement member number = 0Statement start timestamp = 08/24/2015 13:54:30.301498 Statement stop timestamp = 08/24/2015 13:54:30.301553 Elapsed time of last completed stmt(sec.ms)= 0.000055Total Statement user CPU time = 0.000052Total Statement system CPU time = 0.000000SQL compiler cost estimate in timerons = 0SQL compiler cardinality estimate = 0Degree of parallelism requested = 1Number of agents working on statement = 1Number of subagents created for statement = 1Statement sorts = 0Total sort time = 0Sort overflows = 0Rows read = 0Rows written = 0Internal rows deleted = 0Internal rows updated = 0Internal rows inserted = 0Rows fetched = 0Buffer pool data logical reads = 0Buffer pool data physical reads = 0Buffer pool temporary data logical reads = 0Buffer pool temporary data physical reads = 0Buffer pool index logical reads = 0Buffer pool index physical reads = 0Buffer pool temporary index physical reads = 0Buffer pool xda logical reads = 0Buffer pool xda physical reads = 0Buffer pool temporary xda logical reads = 0Buffer pool temporary xda physical reads = 0Blocking cursor = NOAgent process/thread ID = 56Memory usage for application:Node number = 0Memory Pool Type = Other MemoryCurrent size (bytes) = 196608High water mark (bytes) = 327680Configured size (bytes) = 1868365824* Summary Table:Type Number Repetitions Total Time (s) Min Time (s) Max Time (s) Arithmetic Mean Geometric Mean Row(s) Fetched Row(s) Output--------- ----------- ----------- -------------- -------------- -------------- --------------- -------------- -------------- -------------Statement 1 1 0.000000 0.000000 0.000000 0.000000 0.000000 0 0* Total Entries: 1* Total Time: 0.000000 seconds* Minimum Time: 0.000000 seconds* Maximum Time: 0.000000 seconds* Arithmetic Mean Time: 0.000000 seconds* Geometric Mean Time: 0.000000 seconds---------------------------------------------* Timestamp: Mon Aug 24 2015 13:54:30 CST。

DB2基础教程文档

DB2基础教程文档

DB2基础教程文档DB2是一个关系型数据库管理系统(RDBMS),用于存储、管理和操作数据。

它是由IBM开发的,被广泛应用于企业级应用程序和数据仓库。

本教程将介绍DB2的基本概念、常用命令和操作,帮助初学者快速入门并使用DB2进行开发和管理。

1.DB2简介-DB2的历史和发展-DB2的特点和优势-DB2的应用场景2.安装和配置DB2-配置DB2实例-创建和配置数据库3.数据库对象的管理-创建表和定义列-管理数据类型和约束-创建索引和视图-管理存储过程和触发器4.数据的插入、查询和更新-插入数据到表中-使用SELECT语句查询数据-更新和删除数据-使用JOIN操作关联表5.数据库事务和并发控制-事务的概念和特性-事务的隔离级别-并发控制的方法和技术6.数据库备份和恢复-备份和还原数据库-日志和事务恢复-数据库迁移和升级7.性能优化和查询调优-查询执行计划的分析-索引的设计和优化-查询性能调优的常用技巧8.高级功能和扩展-分布式数据库和数据复制-数据库安全和权限管理-数据库监控和性能调优工具9.常用的DB2命令和工具-DB2的命令行工具- 使用DB2 Control Center管理数据库- 使用IBM Data Studio进行开发和调试10.实际案例和练习-设计和创建一个简单的数据库-实现一个实际应用的数据模型-进行数据库调优和性能提升的练习总结:DB2是一款功能强大的关系型数据库管理系统,本教程详细介绍了DB2的基本概念、常用命令和操作,帮助初学者快速入门并能够实践开发和管理数据库。

希望通过学习本教程,读者能够掌握DB2的基本知识和技能,并在实际应用中获得更好的数据库性能和效果。

DB2操作指南及命令大全

DB2操作指南及命令大全

DB2操作指南及命令大全1.启动实例(db2inst1):db2start2.停止实例(db2inst1):db2stop3.列出所有实例(db2inst1)db2ilist4.列出当前实例:db2 get instance5.设置当前实例set db2instance=db26.察看示例配置文件:db2 get dbm cfg|more7.更新数据库管理器参数信息:db2 update dbm cfg using para_name para_value 8.创建数据库:db2 create db test9.察看数据库配置参数信息db2 get db cfg for test|more10.更新数据库参数配置信息db2 update db cfg for test using para_name para_value 11.删除数据库:db2 drop db test12.连接数据库db2 connect to test13.列出所有表空间的详细信息。

db2 list tablespaces show detail14.列出容器的信息db2 list tablespace containers for tbs_id show detail15.创建表:db2 ceate table tb1(id integer not null,name char(10))16.列出所有表db2 list tables7.插入数据:db2 insert into tb1 values(1,’sam’);db2 insert into tb2 values(2,’smitty’);18.查询数据:db2 select * from tb19.数据:db2 delete from tb1 where id=10.创建索引:db2 create index idx1 on tb1(id);1.创建视图:db2 create view view1 as select id from tb12.查询视图:db2 select * from view13.节点编目db2 catalog tcp node node_name remote server_ip server server_port 4.察看端口号db2 get dbm cfg|grep SVCENAME5.测试节点的附接db2 attach to node_name6.察看本地节点db2 list node direcotry7.节点反编目db2 uncatalog node node_name8.数据库编目db2 catalog db db_name as db_alias at node node_name9.察看数据库的编目db2 list db directory0.连接数据库db2 connect to db_alias user user_name using user_password 1.数据库反编目db2 uncatalog db db_alias2.导出数据db2 export to myfile of ixf messages msg select * from tb1 3.导入数据db2 import from myfile of ixf messages msg replace into tb1 如有问题用:import from c:/backup/usercar of ixf create into usercar4.导出数据库的所有表数据db2move test export5.生成数据库的定义db2look -d db_alias -a -e -m -l -x -f -o db2look.sql6.创建数据库db2 create db test17.生成定义db2 -tvf db2look.sql8.导入数据库所有的数据db2move db_alias import9.重组检查db2 reorgchk0.重组表tb1db2 reorg table tb11.更新统计信息db2 runstats on table tb12.备份数据库testdb2 backup db test3.恢复数据库testdb2 restore db test44.命令处理器参数列举可用命令格式:db2 list command options更改命令格式:update command options using option value(on/off)实例:比如更改命令行自动提交的参数2=>update command options using C off--或on,只是临时改变命令行下db2set db2options=+c --或-c,永久改变45. 获取当前机器db2所有配置信息:db2support . -d dbname -c此时数据库管理程序将生成一个db2support 压缩文件包。

db2look 参数

db2look 参数

db2look 参数一、概述db2look 是一个用于导出DB2 数据库对象定义和数据的命令行工具。

通过使用不同的参数,可以实现对数据库中表、视图、索引等对象的定义以及数据的导出。

本文将详细介绍 db2look 命令的各个参数及其用途。

二、常用参数1. -d 或 --database用于指定要导出的数据库名称。

可以是本地数据库或远程数据库的别名。

2. -z 或 --schema用于指定要导出的模式(schema)名称。

可以指定多个模式,多个模式之间用逗号分隔。

3. -t 或 --table用于指定要导出的表名称。

可以指定多个表,多个表之间用逗号分隔。

4. -e 或 --exclude-table用于指定要排除导出的表名称。

可以指定多个表,多个表之间用逗号分隔。

5. -c 或 --create用于生成表的创建语句。

6. -x 或 --xml以 XML 格式导出数据库对象的定义。

7. -a 或 --author在生成的脚本中加入作者信息。

8. -l 或 --log指定日志文件的路径和文件名。

9. -o 或 --output指定输出文件的路径和文件名。

10. -m 或 --mode指定导出模式。

- mode=both:导出表的定义和数据。

- mode=create:只导出表的定义。

- mode=data:只导出表的数据。

11. -p 或 --primary导出表的主键定义。

12. -f 或 --foreign导出表的外键定义。

13. -i 或 --index导出表的索引定义。

14. -v 或 --view导出视图的定义。

15. -q 或 --sequence导出序列的定义。

16. -u 或 --trigger导出触发器的定义。

17. -r 或 --routine导出存储过程和函数的定义。

18. -g 或 --grant导出对象的授权信息。

19. -n 或 --no-headers不在导出文件中包含列标题。

DB2操作手册

DB2操作手册

DB2数据库系统文档中创软件工程股份有限公司金融事业部二○○二年一月目录§ 1 DB2数据库的安装 (3)§2 配置环境变量和修改相应文件 (7)§2.1设置环境变量 (7)§2.2配置HACMP (8)§3 设计物理数据库 (11)§3.1数据在磁盘阵列上的存放原则 (11)§3.2具体的分布情况如下表所示 (11)§4 建立数据库 (12)§4.1建立BANK2数据库 (12)§4.2创建BANK2数据库的表空间 (12)§4.3创建UDF (13)§4.4建立数据库表 (14)§4.5验证创建的正确性 (16)§5 数据库参数调整 (17)§5.1日志参数 (17)§5.2修改共享内存 (18)§6 常用文件说明 (20)§7 常用命令 (22)§7.1常用管理命令 (22)§7.2常用SQL语句 (25)§8 附录 (26)§8.1数据库配置文件 (26)§8.2实例配置文件 (28)§8.3备份方案 (30)§8.3.1 数据库的备份 (30)§8.3.2使用BACKUP命令注意事项 (32)§8.3.3 数据库的恢复 (32)§ 1 DB2数据库的安装1.注册为具有超级用户权限的用户(root)2.将标有“DB2 UDB V7.1 for AIX”的软件光盘插入驱动器3.输入如下命令,以创建一个目录来安装该 CD-ROM:# mkdir -p /cdrom 其中 cdrom 表示 CD-ROM 安装目录。

输入如下命令,来分配 CD-ROM 文件系统:# smitty fs4.选择文件系统5.选择添加/更改/显示/删除文件系统6.选择CDROM 文件系统7.选择添加 CDROM 文件系统8.在弹出窗口中,输入如下项作为安装点:/cdrom9.通过输入以下命令来安装 CD-ROM 文件系统: smit mountf10.在文件系统名称字段中输入值。

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