db2 sequence

some SQL differences between db2 and oracle. This is inevitable, but most simple SQL statements are the same. Here are some examples: Query sequence oracle: select T18_ONLINE_TASKFACT_TASKKEY.currval from dual (current value) select T18_ONLINE_TASKFACT_TASKKEY.nextval from dual (next value) db2 select prevval for T18_ONLINE_TASKFACT_TASKKEY from sysibm. sysdummy

Understanding how DB2 uses memory can prevent over-allocating memory and help tune memory usage for better performance.This article will teach you the basics of DB2 memory usage, as well as the concept of shared memory and private memory. These contents apply to both 32-bit and 64-bit systems. Although there are some limitations on 64-bit systems, they are unlikely to reach these limits for some time to com

The following articles mainly describe the correct steps for DB2 backup and cross-platform migration. If you are curious about the correct steps for DB2 backup and cross-platform migration, the following articles will unveil its secrets. The following is a detailed description of the article. I hope you can learn from it. Database, backup, DB2, cross-platform mig

Sort common DB2 scripts -- Tablespace resizing Alter tablespace BAS_DW_ENT ADD (Device '/dev/vx/rdsk/n01datadg3/dwentlv_100g_01_01' 3276800) on dbpartitionnum (1) ADD (Device '/dev/vx/rdsk/n02datadg3/dwentlv_100g_02_02' 3276800) on dbpartitionnum (2) ADD (Device '/dev/vx/rdsk/n03datadg3/dwentlv_100g_03_03' 3276800) on dbpartitionnum (3) ADD (Device '/dev/vx/rdsk/n04datadg3/dwentlv_100g_04_04 '3276800) on dbpartitionnum (4) ADD (Device '/dev/vx/rdsk/n0

Db2 command list has been working for more than a month. Because the company wants to use DB2 databases, it always tries its best to read this book. For a while, I have some experiences and summarized some commonly used DB2 commands, share it with you! I hope you will be helpful .. Start the DB2 service: db2start disab

Strategizing DB2-transforming from Oracle O M (the first choice for database O M workers)Basic InformationAuthor: Wang feipeng Wang fuguo Liu xusun Yue [Translator's introduction]Series name: dancing DB2 SeriesPress: Electronic Industry PressISBN: 9787121177439Mounting time:Published on: February 1, August 2012Start: 16Page number: 480Version: 1-1Category: ComputerMore about "" and "strategizing

Tags: ref stat cache used and LAN Currval ext ACLIf I were Cristiano Ronaldo . Brief introduction of the simple use method of ORACLE PL/SQL sequence (sequence) Sequence is widely used in Oracle, meaning the serial number, which automatically increases the specified variable, such as 1 or 2 successive increments or more. 1. Creating a

Tags: LAN use Rights Management program for PAD details ORM RepositoryReproduced in the following content: http://blog.csdn.net/xiyuan1999/article/details/8135263 Permissions in the DB2 There are three main security mechanisms in DB2 that can help DBAs implement database security plans: Authentication (aut

In the database, the importance of logs is very large, so logs must be understood first. Log Type:Primary log (Primary logs)Pre-allocated. The available quantity is specified by the LOGPRIMARY parameter of db cfg.Secondary log (Secondary logs)Dynamically allocate as needed. The maximum number is determined by the LOGSECOND parameter of db cfg.All connections are closed and deleted.If LOGSECOND is-1, the log size is not limited.Log Record type:There are two types of cyclic logs and archive logs.

Sort out the online backup recovery steps 1. Find the database db2 list history backup all for xcldb 2. before the database is damaged, run the db2ckrst command to obtain the recovery sequence. skip this step if the database to be recovered is damaged. db2ckrst-d xcldb-t 20131018111438-r database is useful in Incremental Backup recovery. 3. Check and obtain the information of the backup file db2ckbkp-h C: \

partitions with the same names as when we created the table. The IDS are 0, 1, 2, and 3 in sequence, and the data in the tablespace DMS_D1ID is 8) DMS_D2ID is 9), DMS_D2ID is 10), and DMS_D3ID is 11. In this example, the tablespace information is as follows: Listing 3. tablespace Information db2"selectsubstr(TBSPACE,1,18)tablespace_name,TBSPACEID,TBSPACETYPE fromsyscat.tablespaces" TABLESPACE

. Selectivity refers to the percentage of the result set obtained by an SQL operation to the original result set, while cardinality refers to the number of rows of the result set obtained by an SQL operation. To correctly determine the cost of each access plan, the DB2 optimizer estimates the number of returned rows in the result set generated by each step, which is the basis estimation of the optimizer. The DB2