Refresh your TimesTen 6.0.4 to 7.0.5 - error code: 2233

Hello

I upgraded 6.0.4 to 7.0.5 TimesTen and the SQL schema used to create the DSN generates the following warning:

2233 attention: The new X index key columns are a prefix of columns in the index existing Y. consider the deletion of index X

X is an index for a part of the primary key of the table Y. Or to be more precise, X is an index for the first column in the list of columns in the primary key of the table Y.

This index even used to work on TT 6.0.4 without warnings.

What is different on the index of manipulation in the new version of TT?

Is it safe to delete the index?

Thank you
Milena

The first thing to understand here is that this is just a warning, not an error. TimesTen simply alerts you that additional index is useless and does not provide any benefit for queries. However, it will of course slow down inserts and deletions and consume additional memory so TimesTen notifies you that it is useless. However, it will still create the index.

Note that in TimesTen 6.0, a primary key is always implemented as a hash index. The indices of the hash can be used only to satisfy the equality predicates key so if you had a composite PK and need to make queries using just a subset of the main columns in fact then you will need to create this additional index.

TimesTen 7.0, primary keys can be hash indices or indices of the tree. If you specify the UNIQUE HASH ON THE PAGES () = clause when createion of table n then the PK will be an index hash, otherwise it will be an index of tree (you can also switch between the types of indexes at any time using ALTER TABLE USING HASH INDEX / ALTER TABLE INDEX TREE USE). Is there an index of tree then this can already support partial key queries so that they specify certain subsets of contigupus of main columns and in this case create an additional index on the subset of columns is not necessary.

Of this, I gather your TT 6.0 schema had a primary key, but had not the hash index size by using the UNIQUE HASH ON THE PAGES (pkcols) = n clause (practcie inherently bad because if the hash index is not correctly size performance may be severely degraded). After that moved to 7,0 TT, TT has instead created a tree-T for the KP index, thus making your very unnecessary index and that's why the warning.

If you really want a hash as the KP index, you incldue the clause HASH UNIQUE to force the KP make a hash index, and you also need to properly size using the clause of PAGES. In this case, you must keep your additional index (and you will not get the warning or the other).

Alternatively, you can stick with an index of tree as the PK and waive the additional index.

Chris

Tags: Database

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