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Home -> Community -> Usenet -> c.d.o.server -> Re: sort-of-simple Oracle questions
A copy of this was sent to Steve Parker <steve_at_naweb.com>
(if that email address didn't require changing)
On Wed, 10 Nov 1999 18:37:01 GMT, you wrote:
>hello all,
>
>I running Oracle 8.0.5 on Linux...
>
>I have a few questions i hope somebody could help me with:
>
>1. Can a field in a table be a list of items (i.e., field EMAIL of
>table CUSTOMER contains a list of all email addresses the customer
>has)? Or, must you use a different table to encompas this info in the
>design?
>
In Oracle8.0 and up, yes -- you can use varray's or nested tables to do this. for example:
tkyte_at_8i> create type email_addresses as varray(25) of varchar2(30) 2 /
Type created.
tkyte_at_8i>
tkyte_at_8i> create table t
2 ( cust_id int primary key, 3 emails email_addresses4 )
Table created.
tkyte_at_8i>
tkyte_at_8i> insert into t values ( 1, email_addresses( 'addr1', 'addr2', 'addr3' )
);
1 row created.
tkyte_at_8i>
tkyte_at_8i> select * from t;
CUST_ID EMAILS
---------- --------------------------------------------------
1 EMAIL_ADDRESSES('addr1', 'addr2', 'addr3')
>
>
>2. Is there a SQL command to simply view the current tables that exist
>in a tablespace - just thier names... or a tool that can do it
>(sqlplus, svrmgrl, ect)
>
select segment_name
from dba_segments
where segment_type = 'TABLE'
and tablespace_name = 'YOUR_TABLESPACE'
/
>
>
>3. What useful log files are there? I know about listener.log which
>logs connection attemts to the Oracle listener, but what about logs for
>interaction with the database itself (i.e., record failed SQL attempts,
>ect...)
>
there would be audit tables in the database (for failed sql attempts). you have to enable and configure these (see the admin guide).
there is the alert_$ORACLE_SID.log -- very important. lots of stuff in there.
there are trace files in the user_dump_destination (which defaults to $ORACLE_HOME/admin/$ORACLE_SID/udump typically but can be set in the init$ORACLE_SID.ora file)...
>
>
>Any help with these oddly dispersed questions would be greatly
>appreciated.
>
>thanks,
>steve
--
See http://osi.oracle.com/~tkyte/ for my columns 'Digging-in to Oracle8i'...
Current article is "Part I of V, Autonomous Transactions" updated June 21'st
Thomas Kyte tkyte_at_us.oracle.com Oracle Service Industries Reston, VA USA
Opinions are mine and do not necessarily reflect those of Oracle Corporation Received on Wed Nov 10 1999 - 14:40:59 CST
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