Reposted from: longtang Bay
1.1.1 obtain the first N records
SQL Server: Select Top N * From xtable
ORACLE: Select * From xtable where rownum
DB2: Select * From xtable fetch first n rows only
1.1.2 obtain the current date
SQL Server: Select getdate ()
ORACLE: Select sysdate from dual
DB2: Select current timestamp from sysibm. sysdummy1
1.1.3 connection string
SQL Server: Select Hello + toone
ORACLE: Select
Hchao, a moderator of the IBMDB2 database Professional Forum, once published a blog post to help DB2DBA avoid performance disasters and achieve high performance. I have summarized a fault diagnosis process for our customers, users, and DB2 experts. The following is a detailed description of the 10 most popular e-commerce OLTP applications that use DB2 UDB in Unix, Windows, and OS2 environments.
Hchao, a mod
When applying DB2, you may encounter some seemingly simple problems, especially for beginners.To sum up, I will release it to you. I hope it will be helpful to you. At the same time, you are welcome to discuss, develop, and make progress together!
The characters below are mainly in lower case based on DB27.X.This article does not need to be viewed by DB2 experts.1. What are the levels o
This article mainly tells you about the actual operating scheme of the DB2 V8 database system transfer, and installs DB2 v9 on the system with the old version of the DB2 database installed, migrate all related instances and database systems of the old version to DB2 V9 and port the
When you apply DB2, you may encounter some seemingly simple problems, especially for beginners, I have a simpleSummed up, released to everyone, I hope that we can help, but also welcome everyone to discuss together, common development and common progress!
The following are mainly based on db27.x. The following characters are lowercase. This article for DB2 Master is not to see. What
Brief introduction
To understand the new multithreaded functionality in DB2 9.5, this article first discusses the DB2 process model. The entire DB2 process model is controlled by the Base System Utilities (bsus). BSU allocates memory for instance and database, intercepts and processes signals, and handles exceptions s
PS: Need to enter DB2 's account before executing the command: Su db2inst1Modify Password: Change the corresponding operating system password, Windows can change db2admin password, linux change db2inst1 password can be, DB2 's database password is tied to the operating system, as you can say, only need to modify the user's password on the operating system. You want to change that user's password, you change
DB2 supports Incremental Backup (Incremental Backup) and Delta Backup (Delta Backup. incremental backup is equivalent to a differential backup in Oracle, that is, after a full backup, all the changes since the full backup are backed up for each other Incremental backup. delta backup is equivalent to Incremental Backup in Oracle. Each Incremental Backup only backs up the incremental parts since the previous backup. A detailed Incremental Backup example
1. Disable DB2Db2stop or db2stop force.In the script, write both of them to avoid using the db2stop force command, for example:Db2stopDb2stop force2. Start DB2Db2start3. view the local node directoryDB2 list node directory4. cataloguing a TCP/IP NodeDB2 catalog TCPIP node 5. node CataloguingDB2 catalog TCP node node_name remote server_ip server server_port6. node deserializationDB2 uncatalog node node_name7. Cancel node CataloguingDB2 uncatalog node 8. Test node attachmentDB2 attach to node_name
Today, the customer visited (Japanese) and asked me the difference between DB2 and Oracle. Because it's not a DBA, I haven't really summed it up. But my first feeling: One is instance, one is database. Building Ora libraries and DB2 libraries is not the same. It's really はずかしい.
System Architecture Overview
First, we need to understand the architecture used by Oracle and understand how it differs from
Operation commands in the db2 database
Common DB2 commands. For more information about using db2, see. The management Client no longer has a control center after v9.7, but uses the Data Studio Client. The license key is not applied during the installation of the DB2 database product. However, the following products do
window, resulting in an accident.
So in order to let the vast number of Bo friends no longer make similar to me a low-level error so that this blog, but also exposed the author's empirical thinking seriously, not fine. So let's take a thorough look at what DB2 do when doing reorg operations!
According to the IBM official website, we are issuing reorg command DB2 will experience a sort, build, Replace idx
1 Introduction
The minimal recovery and transaction units in relational databases (DB2, Oracle, Sybase, Informix, and SQL Server) are a transaction (Transactions). Transactions are ACID (atomicity, consistency, isolation, and durability) feature. In order to ensure the correctness of concurrent users when accessing the same database object (that is, no loss updates, repeatable reads, no dirty data reads, no Phantom reads ), the database introduces the
Tags: default change plain out set GES and not definedDB2 is a series of relational database management systems exported by IBM, which serve on different operating system platforms. We will explain the DB2 ten optimization techniques. To help DB2 DBAs avoid performance disasters and get high performance, I've summarized a troubleshooting process for our customers, users, and
On a Linux or UNIX machine, set up multiple DB2 systems before DB2forLinux, UNIX, and andWindowsVersion8, SAP customers can only install on one physical machine
On a Linux or UNIX machine, set up multiple DB2 systems before DB2 for Linux, UNIX, and Windows Version 8, SAP customers can only install on one physical machine
One Linux or UNIX Machine Sets multip
DB2 database commands
1. Start the database
Db2start
2. Stop the database
Db2stop
3. Connect to the database
Db2 connect to o_yd user db2 using pwd
4. Read Database Management Program Configuration
Db2 get dbm cfg
5. Write Database Management Program Configuration
Db2 update
Common DB2 commands
Common DB2 commandsI. Basics1. db2 connect to Db2 connect to 2. db2 force application all -- force all applications to disconnect the database3. db2 backup db db2name 4. db
On any workstation platform that supports DB2 UDB, MTK supports database conversion from Sybase 11.9.2 and Microsoft SQL Server 6.5 and 7.0 to DB2 UDB version 7.2 and higher. For versions earlier than Sybase V11.x and earlier than ms SQL Server V7.0, MTK can also be used to convert scripts imported from these databases. MTK does not support sending data to DB2 UD
BKJIA Summary: in the previous article, we read the classification and analysis of DB2 performance problems. This time, we will focus on the Performance Optimization of DB2 utilities.
Let's take a look at how to improve the performance of backup operations:
Increase the size of the Database Configuration Parameter UTIL_HEAP_SZ, which is used to buffer backup and
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