创建一个Aging功能的cache group

创建一个Aging功能的cache group，常在READONLY cache group中使用。
LIFETIME为5分钟，探测周期为1分钟。

Oracle端上的该表也需要有一个AgeTimestamp字段，类型为TIMESTAMP。
SQL> alter table customer add (AgeTimestamp TIMESTAMP);
将所有记录都更新为当前时间。
SQL> update customer set agetimestamp=sysdate;

已更新10行。

CREATE READONLY CACHE GROUP AgingCacheGroup
AUTOREFRESH
MODE INCREMENTAL
INTERVAL 5 SECONDS
STATE PAUSED
FROM
CUSTOMER (CUSTID INT NOT NULL,
NAME CHAR(100) NOT NULL,
ADDR CHAR(100),
ZIP INT,
AgeTimestamp TIMESTAMP NOT NULL,
PRIMARY KEY (Custid))
AGING USE AgeTimestamp LIFETIME 5 MINUTES CYCLE 1 MINUTES;

Command> desc customer;

Table TT.CUSTOMER:
  Columns:
   *CUSTID                          NUMBER (38) NOT NULL
    NAME                            CHAR (100) NOT NULL
    ADDR                            CHAR (100)
    ZIP                             NUMBER (38)
    AGETIMESTAMP                    TIMESTAMP (6) NOT NULL
  Aging use AGETIMESTAMP lifetime 5 minute cycle 1 minute on

1 table found.
(primary key columns are indicated with *)

在Timesten端unload数据，可以确保Timesten里的数据总是最近5分钟的。
Command> unload cache group agingcachegroup;