波形产生函数 db2pow函数/db2mag函数/pow2db函数/mag2db函数 axis tight 位操作函数 typecast函数 gtext函数 fft函数(可以操作矩阵) filter函数(可以操作矩阵) mode求取众数 exist检查变量、脚本、函数、文件夹或类的存在情况 find查找特定元素的索引和值(能够指定所查找的符合条件的元素个数、查找方向) shiftdim(移...
运行命令db2 connect to db来建立数据库连接; 由于我们已经设置了DB2_OVERRIDE_BPF环境变量, 此连接应该可以成功; 4. 连接建立后, 不要做其他操作, 立刻修改bufferpool; db2 alter bufferpool bufferpool-name size number-of-pages 5. 为了使得我们修改的新buffer pool的大小可以生效, 需要先运行命令 db2 connect...
Transfer Rate: Specifies the time required to read one page into memory, in milliseconds. Dropped Table Recovery: Specifies whether tables in the table space that have been dropped can be recovered using the RECOVER TABLE ON option of the ROLLFORWARD command. This option can be specified only f...
In a Db2 pureScale environment, the cluster caching facility provides a common group buffer pool (GBP) that is shared by all members. Each member also manages its own set of local buffer pools (LBPs). The GBP is a single buffer pool that supports all Db2 page sizes and that all ...
You must analyze the server performance for varying size of DB2 buffer pool to determine the optimum DB2 buffer pool size for your server.
The Buffer Pool Using Nullsin DB2 By Craig S. Mullins A null represents missing or unknown information at the column level. If a column “value” can be null, it can mean one of two things: the attribute is not applicable for certain occurrences of the entity, or the attribute applies ...
4.Operations like join, sort that needs large temporary tables in temp spaces. (tablespace可以使用指定的bufferpool) 4.Bufferpools带来的开销 DB2需要为bufferpool中的每一个page分配100 byte的描述符,占用的dbheap上的空间。也就是说,对于一个1GB的bufferpool,需要消耗dbheap上25MB的空间。因此,在扩展bufferpo...
Recursive SQL can be very elegant and efficient. However, because of the difficulty developers can have understanding recursion, it is sometimes thought of as “too inefficient to use frequently.” But, if you have a business need to walk or explode hierarchies in DB2, recursive SQL will likely...
DB2 environment Configuring client and server connectivity: walkthroughs of four typical scenarios Managing DB2 storage: partitions, tablespaces, buffer pools, ... RF Chong,C Liu,SF Qi,... 被引量: 3发表: 0年 DB2 UDB V8.2 on the Windows Environment In this chapter we introduce the DB2 tech...
BUFFERPOOL command is documented here in the DB2 Information Center at: http://publib.boulder.ibm.com/infocenter/dzichelp/v2r2/topic/com.ibm.db29.doc.c omref/db2z_cmd_alterbufferpool.htm There are a number of decisions that a DB2 system administrator must make, such as choosing many ...