How often do i need to Rebuild Mail to get search to work

Question

i seem to be not getting correct results on some searches and when i click on an email from someone i /don't/ see the other emails highlighted from this person listed but if i click on /another/ email with this person's same address i /do/ see a /third/ email highlighted in green.
is this simply a case of needing to run a REBUILD or are there other factors at work here?
also, does the search dialog in the top right hand corner work the way you would imagine it should? i sometimes don't see results that i think i should.
i have multiple email boxes (about 13) all listed under "Inbox".
TIA

Answer 1

> In "connect by level <= 3000000", this is where I specify the number of records to be
inserted into the database, right?
Yes. Caveat - I have not looked at the execution plan of this SQL to see what (if any) the performance and overheads are. I usually only use it for generating 1000's of rows for testing purposes. Not millions. But it seems to work fine with the 3 million limit I used. It should work with 37 million.. touch wood.
> Another question, if I want to insert random string but with specify constraint, is that possible in SQL?
Yes - you can use the CASE statement in SQL. The CASE statement is described in the Oracle® Database SQL Reference guide.
Obviously using a CASE statement will have a performance impact of sorts - but it will still be faster than using a PL/SQL function to do it.
> how about BLOBs?
That depends on what are you planning to put into the LOB. If each row has to contain a random BLOB, then you may need to resort to a PL/SQL function that can return a randomly generated BLOB of a random length.
If the BLOB can be fixed, you can do it with a bind variable - as a CLOB. Define a PL/SQL procedure (or function) that returns a CLOB of the size that you need. Let's call this procedure CreateClob.
In SQL*Plus you define a CLOB bind variable:
SQL> var b CLOB
Then you call this proc and assign the resulting CLOB that it creates to the bind variable:
SQL> exec CreateClob( :b )
Now you can use the CLOB bind variable in the SQL statement. E.g.
SQL> insert into foo( clob_col ) values( :b );
Consult the Oracle® Database PL/SQL Packages and Types Reference guide for details on the DBMS_LOB package.
Both documents contains all the details and includes examples - and are references that I still use almost daily when dealing with Oracle. Copies of Oracle docs are available at http://tahiti.oracle.com