Unable to create cache with several tables group

Hello

I need to create a group of cache with several tables, which are referential to the other.

There are 2 related tables and table 1 child...
While trying this thing, it gives me an error:

8222: multiple parent tables found

It is not possible to use several tables of root in a single cache group? Is there another way to use it?

Script, I used is:

create a cache group asynchronous writethrough TEST. CG1
of the TEST. ROOT1)
KEY PRIMARY ID VARCHAR2 (8 BYTES),
NAME VARCHAR2 (50 BYTE),
DESCRIPTION VARCHAR2 (255 BYTE),
POLICYTYPEID VARCHAR2 (7-BYTE)),

TEST. ROOT2)
PARAMTYPEID VARCHAR2 (5 BYTES) PRIMARY KEY,
PARAMETERUSAGE VARCHAR2 (1 BYTE),
NAME VARCHAR2 (25 BYTE),
DESCRIPTION VARCHAR2 (255 BYTE)),

TEST. CHILD1)
PARAMDETAILID NUMBER (20) PRIMARY KEY,.
ID VARCHAR2 (8 BYTE),
PARAMETERUSAGE VARCHAR2 (1 BYTE),
DISPLAYVALUE VARCHAR2 (255 BYTE),
OPERATORID VARCHAR2 (5 BYTE),
VENDORID NUMBER (20).
FOREIGN KEY REFERENCES TEST. ROOT1 (ID),
TEST KEY (PARAMETERUSAGE) REFERENCES STRANGERS. ROOT2 (PARAMETERUSAGE));

You can't have multiple root within a group of cache tables. The requirements for tables in the group a cache are very strict; There must be only one top-level (root table) table and there may possibly be several children tables. Tables of the child should be linked through foreign keys to the root table or a child table above in the hierarchy.

The solution for your case is among the tables of root and the other root table in a separate cache group and the child table in a cache group. If you do this, you must take care of a few things:

1. you cannot define foreign keys between the tables of groups of different cache in TimesTen (keys may exist in Oracle) so the application must enforce referential integrity itself for these cases.

2. If you load data in a cache group (using LOAD the GROUP CACHE or "load we demand") and Timesten will not automatically load the corresponding data in the other group of cache (since he doesn't know the relationship). The application must load the data into the other group of cache explicitly.

There is no problem with transactional consistency when changes are pushed to Oracle. TimesTen maintains and reinforces the coherence transactional regardless of how the tables are arranged in groups cache correctly.

Chris

Tags: Database

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