Create a group of cache problem

Hello

I have three tables T1, T2 and T3 in Oracle. The T3 table has two foreign keys F1 and F2 which refers to tables T1 and T2, respectively. When I try to create the cache group in TimesTen for table T3, I get the following error:

«8211: user table.» T1 is not a member of the Group of cache.

Here's the script for Oracle and TimesTen

Oracle
======


CREATE TABLE T1
(ID1 integer PRIMARY KEY,
A varchar (30));

CREATE TABLE T2
(ID2 integer PRIMARY KEY,
A varchar (30));

CREATE TABLE T3
(ID3 integer PRIMARY KEY,
OF THE varchar (30),
Whole F1 references T1 (ID1),
Entire F2 references T2 (ID2)
);


TimesTen
========


CREATE GROUP OF READONLY C_T1 CACHE
AUTOREFRESH INTERVAL 5 SECONDS
FROM T1
(ID1 NUMBER (38) NOT NULL PRIMARY KEY,)
THE VARCHAR2 (30));

CREATE GROUP OF READONLY C_T2 CACHE
AUTOREFRESH INTERVAL 5 SECONDS
THE T2
(ID2 NUMBER (38) NOT NULL PRIMARY KEY,)
THE VARCHAR2 (30));

CREATE GROUP OF READONLY C_T3 CACHE
AUTOREFRESH INTERVAL 5 SECONDS
T3)
ID3 NUMBER (38) NOT NULL PRIMARY KEY,
F1 NUMBER (38) NOT NULL,
F2 NUMBER NOT NULL, (38)
FOREIGN KEY (F1) REFERENCES (ID1) T1,
FOREIGN KEY (F2) REFERENCES T2 (ID2),
THE VARCHAR2 (30));


How can I create groups of cache of these paintings? Please notify
Thank you

Vishin Das

There are two problems here:

1. If you want to set a FK between tables cached in TimesTen then all tables must be part of the same group of cache.

2. part of a group of cache, that you must have a single table at a higher level and all the other tables should be child tables of this table or one of its children. Which tables should be linked hierarchically.

So at first glance you may not be cached in this series of paintings in TimesTen, but actually you can because...

1. you do not have to set all the present FKs in oracle in cache TT groups. for groups of READONLY cache isn't generally a problem because FK execution happens in Oracle. Sometimes, it is not a problem for WAT cache groups either, but you know how the application handles data to be sure about this.

2. all READONLY cache with the same AUTOREFRESH interval groups are updated in the same transaction; You can avoid transactional inconsistencies in the data in the cache.

So the best solution here is probably:

CREATE GROUP OF READONLY C_T1 CACHE
AUTOREFRESH INTERVAL 5 SECONDS
FROM T1
(ID1 NUMBER (38) NOT NULL PRIMARY KEY,)
THE VARCHAR2 (30));

CREATE GROUP OF READONLY C_T2 CACHE
AUTOREFRESH INTERVAL 5 SECONDS
THE T2
(ID2 NUMBER (38) NOT NULL PRIMARY KEY,)
THE VARCHAR2 (30));

CREATE GROUP OF READONLY C_T3 CACHE
AUTOREFRESH INTERVAL 5 SECONDS
T3)
ID3 NUMBER (38) NOT NULL PRIMARY KEY,
F1 NUMBER (38) NOT NULL,
F2 NUMBER NOT NULL, (38)
THE VARCHAR2 (30));

CREATE INDEX T3_IX1 ON T3 (F1);
CREATE INDEX T3_IX2 ON T3 (F2);

Indexes are created based on the assumption that, when the application queries these tables cached, it is likely to join based on the PK/FK relationship. The presence of the indices will speed up joins immensely.

Chris

Tags: Database

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