pooled table/table pools

就个人理解，池表和簇表是表的类型，是一种逻辑存在，SAP中可对其象表一样的访问；表池和表簇是用来存放池表和簇表的，是一种物理存在，数据库中可以直接看到它们的结构
SAP这样的抽象是为了应用的需要，它们应用于不同的场合，以提高性能或降底复杂度

Table pools (pools) and table clusters (clusters) are special table types in the ABAP Dictionary. The data from several different tables can be stored together in a table pool or table cluster. Tables assigned to a table pool or table cluster are referred to as pooled tables or cluster tables.

A table pool or table cluster should be used exclusively for storing internal control information (screen sequences, program parameters, temporary data, continuous texts such as documentation). Data of commercial relevance is usually stored in transparent tables.

creating table pool/table cluster
1.create table pool
tcode:se11

2.menu:utilitis-->other dictionary objects
table pool/cluster:zpools
--->create

3.tab.pool/cluster assign
pool/cluster name:zpools
table pool
--->OK

4.input short text

5.menu:goto-->technical settings
size category:4
--->save

6.check syntax
--->check
--->active


create pooled table/cluster table
1.tcode:se11
database table:ZPOOL_TAB
--->create

2.delivery and maintaince
delivery class:A
data browers/table view mant.:N

3.menu:extras-->change table category
table type:pooled table
--->copy

4.delivery and maintaince
Pool/cluster:zpools

5.input fields and technical settings

6.active


the cluster table implement is same