Load Cache and UnLoad Cache Problem

Question

Hi,
I have inserted 150k Rows from TimesTen and it is been replicated successfully from TimesTen to my Oracle DB.I checked no of rows in TimesTen and Oracle ,showing same rows as 150K rows.
AT Oracle End
Count starts for me is from 2 so 153599 rows i will be getting 2 to 153600 rows
SQL> Select Count(*) from oratt.test_rep;
COUNT(*)
153599
SQL> Select Col108 from oratt.test_rep where Col108=153600;
COL108
153600
SQL> Update oratt.test_rep set Col108=Col108+1 where Col108=153600;
1 row updated.
SQL> Select Col108 from oratt.test_rep where Col108=153600;
no rows selected
SQL> Select Col108 from oratt.test_rep where Col108=153601;
COL108
153601
AT TimesTen End
Command> UNLOAD CACHE GROUP CACHEADMIN.TESTCACHE;
Command> LOAD CACHE GROUP CACHEADMIN.TESTCACHE COMMIT every 1000 Rows;
153599 cache instances affected.
Command> Select Col108 from oratt.test_rep where Col108=153600;
< 153600 >
1 row found.
Command> Select Col108 from oratt.test_rep where Col108=153601;
5213: Bad Oracle login error in OCISessionBegin(): ORA-01017: invalid username/password; logon denied rc = -1
5131: Cannot connect to backend database: OracleNetServiceName = "MYDB", uid = "Userid", pwd is hidden, TNS_ADMIN = "", ORACLE_HOME= ""
5109: Cache Connect general error: BDB connection not open.
0 rows found.
The command failed.
Command> cachegroups;
Cache Group CACHEADMIN.TESTCACHE:
Cache Group Type: Asynchronous Writethrough (Dynamic)
Autorefresh: No
Aging: LRU on
Root Table: ORATT.TEST_REP
Table Type: Propagate
Why i am getting this error i have update my row in Oracle but it is not LOADED in TimesTen, the old value is there in TimesTen .
Thanks!

Answer 1

This is a dynamic cache group so when you run a dynamic load capable statement such as this Select Col108 from oratt.test_rep where Col108=*153600;* (presumably Col108 is a key? column) then if there are no matching rows in TiemsTen, TimesTen will attempt to go to oracle to fetch the row(s). These rows will then be inserted into the Tt cache (for future access) as well as being returned to the application. The error occurs because your ttIsql session does not have correct credentials for Orcle (maybe you omitted the OraclePWD= attribute when you connected to ttIsql?).
If you do not want/need this dynamic load behaviour then you should create the cache group as a non-dynamic cache group.
With regard to your question about bi-directional cache groups, no we do not support those. If you do change data in the Oracle table which is cached by executing DML against it directly in Oracle then those changes may get overwritten by later changes propagated from TimesTen. If your workload is partitioned so that different sets of rows are updated in Oracle versus TimesTen then that is okay of course. Any updates made in Oracle will not automatically be propagated to TimesTen. You can manually refresh the cache group to pick up any new data if you want to.
Chris