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TNS:could not resolve the connect identifier specified
Backtrace message unwound by exceptions
invalid identifier
PL/SQL compilation error
internal error
missing expression
table or view does not exist
end-of-file on communication channel
TNS:listener unknown in connect descriptor
insufficient privileges
PL/SQL: numeric or value error string
TNS:protocol adapter error
ORACLE not available
target host or object does not exist
invalid number
unable to allocate string bytes of shared memory
resource busy and acquire with NOWAIT specified
error occurred at recursive SQL level string
ORACLE initialization or shutdown in progress
archiver error. Connect internal only, until freed
snapshot too old
unable to extend temp segment by string in tablespace
Credential retrieval failed
missing or invalid option
invalid username/password; logon denied
unable to create INITIAL extent for segment
out of process memory when trying to allocate string bytes
shared memory realm does not exist
cannot insert NULL
TNS:unable to connect to destination
remote database not found ora-02019
exception encountered: core dump
inconsistent datatypes
no data found
TNS:operation timed out
PL/SQL: could not find program
existing state of packages has been discarded
maximum number of processes exceeded
error signaled in parallel query server
ORACLE instance terminated. Disconnection forced
TNS:packet writer failure
see ORA-12699
missing right parenthesis
name is already used by an existing object
cannot identify/lock data file
invalid file operation
quoted string not properly terminated

Fwd: about "Oracle recommends that unique indexes be created explicitly"

Niall Litchfield


Intended to cc the list

---------- Forwarded message ----------
From: Niall Litchfield <niall.litchfield@(protected)>
Date: Jun 30, 2006 1:00 PM
Subject: Re: about "Oracle recommends that unique indexes be created explicitly"
To: wqhhp@(protected)

There are , at least, two situations to which the guide is referring
demonstrated below. The first is the case where a suitable index
already exists and the second is the case when the constraint is
created as initially deferred.

Connected to:
Oracle Database 10g Enterprise Edition Release - Production
With the Partitioning, OLAP and Data Mining options

NIALL @ nl102 >create table tab1(id number, description varchar2(10));

Table created.

NIALL @ nl102 >create table tab2(id number , description varchar2(10));

Table created.

NIALL @ nl102 >create index i1 on tab1(id);

Index created.

NIALL @ nl102 >alter table tab1 add constraint pk_tab1(id);
alter table tab1 add constraint pk_tab1(id)
ERROR at line 1:
ORA-00904: : invalid identifier

NIALL @ nl102 >alter table tab1 add constraint pk_tab1 primary key(id);

Table altered.

NIALL @ nl102 >alter table tab2 add constraint pk_tab2 primary key(id)
initially deferred;

Table altered.

NIALL @ nl102 >select index_name,uniqueness from user_indexes
2 where table_name in ('TAB1','TAB2');

------------------------------ ---------
PK_TAB2                NONUNIQUE
I1                   NONUNIQUE

2 rows selected.

NIALL @ nl102 >


Niall Litchfield
Oracle DBA

Niall Litchfield
Oracle DBA