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DBAs maintain Oracle and common undo scripts. Some of the previous articles also involve a lot of things. Here is a simple summary. 1) How to query the size of rollback segments used by a transaction in a database session? sys@ORCL> select b.sid,b.username,a.xidusn,a.used_ublk 2 from v$transaction a,v$session b 3 where a.addr=b.taddr; SID USERNAME XIDUSN USED_UBLK---------- ----------------------------

Tips for DBAs: 10 suggestions for making the database faster bitsCN.com The content of most websites is stored in databases and accessed by users through requests. The database is very fast. There are a lot of skills that allow you to optimize the database speed, so that you do not waste server resources. This article contains ten tips for optimizing the database speed. 0. carefully design the database The first trick may seem to be taken for granted,

: \ Users \ ZML> ------ scott user import ----------------- C: \ Users \ ZML> imp scott/zml file = 'd: \ zml. dmp 'Log = 'd: \ zml1.log' full = yImport: Release 11.2.0.1.0-Production on Monday April 21 21:57:40 2014 Copyright (c) 1982,200 9, Oracle and/or its affiliates. all rights reserved. connect to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-ProductionWith the Partitioning, OLAP, Data Mining and Real Application Te Sting options: the EXPORT file IMP-00013 created by using the

Performance problems may be difficult to diagnose and fix. Problems often occur in the most unexpected situations. In general, problems may evolve and sometimes lead to database application interruptions. From the DBA's perspective, it is important to be aware of taking proactive measures to solve the problem before the performance begins to cause damage to the business. Performance problems may be difficult to diagnose and fix. Problems often occur in the most unexpected situations. In general,

it easier to hit index overlays in complex SQL.such as the following:1 SET STATISTICSIo on 2 SELECTorderstatus, Processstatus, sendticketcity, Flightagency, Eticket, OrderID3 fromDbo. OrdersWHEREOrderstatus='P' andProcessstatus='1' andSendticketcity=1Then continue to select a few indexes to aim at ... In general, indexes that cover between 1 and 2 columns are called small indexes.1 DBCC show_statistics (o_orders,idx_eid_orderdate) 2 DBCC Show_statistics (O_orders,ix_o_order_finishdate)Throug

Tags: work content system Recovery patch Installation Patch issues nbsp Change database managementKnowledge Framework1. How the database works and the architecture2. Database management (Managing databases and database objects)3. Database Backup and Recovery4. Database Failure handling5. Database patch installation and upgrade6. Database performanceJob descriptionThe type of work is divided into:TicketChangeJob description includesApply ChangesDatabase installation patches and upgradesGeneral pr

Tags: suitable for cloud storage aggregation significance AWS Global social OOP globalizationI have been a professional traditional DBA, and the relational database has basically touched. The last two years of part-time management database, now the Internet company infrastructure are on the cloud, there is no traditional sense of DBA.Compared to the past RDBMS eminence, today's "database" concept has been more extensive, including relational, NoSQL, cache, big data and so on. Therefore, the abil

themselves, do not let the timid vision of chaos, do the perseverance of practitioners, for the project into cavity blood.--Dark blue ********************************* Blue's growth kee series _20150820************************************* Original works, from the "Blue Blog" blog, Welcome to reprint, please be sure to indicate the source (Http://blog.csdn.net/huangyanlong). Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced. The growth of

Will DBAs still exist in the NoSQL world? Author: chszs, reprinted with note. Blog homepage: http://blog.csdn.net/chszs Gartner, a consulting firm, published a survey earlier this month targeting adoption of NoSQL in various positions. The results are surprising. : Only 5.5% of DBAs use NoSQL. The reason is not clear yet, and the investigation itself may be somewhat biased. Gartner gave some speculati

[ArticleAuthor: Sun Li link: http://www.cnblogs.com/sunli/ updated by: 2010-09-19] This is a MySQL speech that I will give at the beginning of OTN glad tour in Lima, South Africa, MySQL best practices suitable for DBAs and developers Learn the best MySQL practices suitable for DBAs and developers and learn the correct skills to maximize your MySQL investment benefits. You must understand the differenc

What is a trace tag? For DBAs, mastering Trace Flag is one of the necessary conditions for them to become masters of SQL Server. In most cases, Trace Flag is just a rare trick, but in many cases, these tags allow you to better control SQL Server behaviors. Below are official Trace flags: A trace tag is a tag used to enable or disable certain behaviors of SQL Server. From the above definition, it is not difficult to see that Trace Flag is a way to con

What is a trace tag? For DBAs, mastering Trace Flag is one of the necessary conditions for them to become masters of SQL Server. In most cases, Trace Flag is just a rare trick, but in many cases, these tags allow you to better control SQL Server behaviors. Below are official Trace flags: A trace tag is a tag used to enable or disable certain behaviors of SQL Server. From the above definition, it is not difficult to see that Trace Flag is a way to con

The author is Nivas, the original address is mysqldump–25 tips for DBAs Mysqldump is a text backup or a binary backupinsert 语句来使用数据构成表。 What is the grammar of mysqldump? mysqldump -u [uname] -p[pass] –databases [dbname][dbname2] > [backupfile.sql] How do I back up all the databases using mysqldump?mysqldump -u root -p –all-databases > backupfile.sql How do I back up the specified database using mysqldump?mysqldump -u root -p –databases

performance of the system and various database management operations, including the followingComputing performance of--oracle database--Performance of database access operations--performance of backup and operation4. Create and open a databaseUsing DBCA5. Backing Up the databaseManufacturers have integrated, but need seamless backup recovery must be optimized for processing6. Registering Database UsersCreate users, assign permissions and roles7. Implementing Database DesignCreate table spaces t

Undo series learning-common scripts for oracle DBAs in the process of maintaining oracle and commonly used scripts related to undo. Some of the previous articles also involve a lot of things. Here is a simple summary. 1) How to query the size of rollback segments used by a transaction in a database session? [SQL] sys @ ORCL> select B. sid, B. username,. xidusn,. used_ublk 2 from v $ transaction a, v $ session B 3 where. addr = B. taddr; www.2cto.com s

15 required MySQL management tools for DBAs Today, the response speed of Web applications is one of the keys to success. It is closely related to user interaction, users' views on websites, and even Google website rankings. Database performance is one of the most important factors in response speed. Once an error occurs, all programs will go down. To do well, you must first sharpen your tools. Almost every Web developer has a favorite MySQL management

For new SQL Server database DBAs, pay attention to some small details. Any optimization or modification is based on the business situation. You are welcome to make a picture of what may be wrong or inaccurate. 1.We recommend that you set auto-growth when creating a database to increase by MB (M), and set the step size based on the business volume. Generally, we recommend that you set it to 100-200 MB (see the image ), also, try not to change the initi

Oracle DBAs for IT ninja turtles are commonly used to query enumeration of vomiting blood, oracledba -1. query all objects in the systemSelect owner, object_name, object_type, created, last_ddl_time, timestamp, statusFrom dba_objectsWhere owner = upper ('Scott ') -2. view all tables in the systemSelect owner, table_name, tablespace_name from dba_tables -3. View tables of all usersSelect owner, table_name, tablespace_name from all_tables -4. view the c

Notes for new SQL Server database DBAs Any optimization or modification is based on the business situation. You are welcome to make a picture of what may be wrong or inaccurate. 1. we recommend that you set auto-growth when creating a database to increase by MB (M), and set the step size based on the business volume. Generally, we recommend that you set it to 100-200 MB (see the image ), also, try not to change the initial size. This is the default va

SELECTorderstatus, Processstatus, sendticketcity, Flightagency, Eticket, OrderID3 fromDbo. OrdersWHEREOrderstatus='P' andProcessstatus='1' andSendticketcity=1Then continue to select a few indexes to aim at ... In general, indexes that cover between 1 and 2 columns are called small indexes.1 DBCC show_statistics (o_orders,idx_eid_orderdate) 2 DBCC Show_statistics (O_orders,ix_o_order_finishdate)Through the above index can be seen, Eid and finishdate these two columns, a glance to know should