2 Troubleshooting Installation, Upgrades and Downgrades

This chapter includes the following topics:

Installing 32-bit TimesTen on 64-bit Windows
Downgrading a database with Oracle data types to TimesTen 6.0

Installing 32-bit TimesTen on 64-bit Windows

The default ODBC Data Source Administrator on 64-bit Windows does not show TimesTen 32-bit drivers and DSNs. If Windows is installed in the default location (C:\WINDOWS), use C:\WINDOWS\SysWOW64\odbcad32.exe for the ODBC Data Source Administrator when you are installing 32-bit TimesTen on a 64-bit Windows machine.

Downgrading a database with Oracle data types to TimesTen 6.0

In rare situations, after upgrading a database from TimesTen 6.0, you may find that you need to downgrade a TimesTen 7.0 or later database back to TimesTen 6.0 after the data types are already converted to Oracle types. However, the ttMigrate utility for TimesTen 6.0 does not understand Oracle data types, and this can lead to problems when downgrading databases from TimesTen 7.0 or later. To avoid any pitfalls in the downgrade process, you should convert the Oracle data types back to TimesTen types using TimesTen 7.0 or later first, and only then downgrade the database to TimesTen 6.0, using the following steps:

Create a migration file using TimesTen 7.0 or later ttMigrate.
```
ttMigrate -c datastore datastore.migrate
```
Destroy the database using TimesTen 7.0 or later ttDestroy.
```
ttDestroy datastore
```
Convert the data types to TimesTen types using TimesTen 7.0 or later ttMigrate.
```
ttMigrate -r -noRepUpgrade -convertTypesToTT datastore    datastore.migrate
```
Create a new migration file using TimesTen 7.0 or later ttMigrate.
```
ttMigrate -c datastore datastore.migrate
```
Destroy the database using TimesTen 7.0 or later ttDestroy.
```
ttDestroy datastore
```
In another terminal, with the environment set correctly for TimesTen 6.0, restore the database as a TimesTen 6.0 database using TimesTen 6.0 ttMigrate.
```
ttMigrate -r datastore datastore.migrate
```

Note:

Before restoring the database with TimesTen 6.0 ttMigrate, you must modify the DSN attributes appropriately for using with TimesTen 6.0.