Num of records in v$instance

[prakashs43]

Hi ,

Could u anybody please confirm if , there will ever be more than 1 record in v$instance table . i have seen different scripts for date , time of last instance startup in the following path : http://www.dbasupport.com/oracle/scr...tration/Audit/ why do we need a where clause here .

Thanks .

[stecal]

Just one record.

Column Datatype Description
INSTANCE_NUMBER
NUMBER
Instance number used for instance registration. Corresponds to INSTANCE_NUMBER initialization parameter.


INSTANCE_NAME
VARCHAR2(16)
Instance name

HOST_NAME
VARCHAR2(64)
Name of the host machine

VERSION
VARCHAR2(17)
RDBMS version

STARTUP_TIME
DATE
Time when instance was started up

STATUS
VARCHAR2(7)
STARTED/MOUNTED/OPEN

STARTED after startup nomount

MOUNTED after startup mount or alter database close

OPEN after startup or after database open

PARALLEL
VARCHAR2(3)
(YES | NO) in Oracle Application Cluster mode

THREAD#
NUMBER
Redo thread opened by the instance

ARCHIVER
VARCHAR2(7)
(STOPPED | STARTED | FAILED) FAILED means that the archiver failed to archive a log last time, but will try again within 5 minutes

LOG_SWITCH_WAIT
VARCHAR2(11)
The ARCHIVE LOG/CLEAR LOG/CHECKPOINT event log switching is waiting for. Note that if ALTER SYSTEM SWITCH LOGFILE is hung, but there is room in the current online redo log, then value is NULL

LOGINS
VARCHAR2(10)
ALLOWED | RESTRICTED

SHUTDOWN_PENDING
VARCHAR2(3)
YES | NO

DATABASE_STATUS
VARCHAR2(17)
The status of the database

INSTANCE_ROLE
VARCHAR2(16)
Describes whether the instance is an active instance (PRIMARY_INSTANCE) or a inactive secondary instance (SECONDARY_INSTANCE), or UNKNOWN if the instance has been started but not mounted

ACTIVE_STATE
VARCHAR2(9)
(NORMAL|QUIESCING|QUIESCED).

NORMAL indicates the database is in a normal state.

QUIESCING indicates that the ALTER SYSTEM QUIESCE RESTRICTED statement has been issued: no new user transactions, queries, or PL/SQL statements are processed in this instance. User transactions, queries, or PL/SQL statements issued before the ALTER SYSTEM QUIESCE RESTRICTED statement are unaffected. DBA transactions, queries, or PL/SQL statements are also unaffected.

QUIESCED indicates that the ALTER SYSTEM QUIESCE RESTRICTED statement has been issued: no user transactions, queries, or PL/SQL statements are processed. DBA transactions, queries, or PL/SQL statements are unaffected. User transactions, queries, or PL/SQL statements issued after the ALTER SYSTEM QUIESCE RESTRICTED statement are not processed.

Note that a single ALTER SYSTEM QUIESCE RESTRICTED statement quiesces all instances in an Oracle9i Real Application Clusters environment. After this statement has been issued, some instances may enter into a quiesced state before other instances; the system is quiesced when all instances enter the quiesced state.

[jmodic]

You can definitely have more than one record returned from V$INSTANCE, but only if you are having paralel server (OPS/RAC) configuration on that database. One record per instance that has database mounted.

The script you are refering to (http://www.dbasupport.com/oracle/scripts/Administration/Audit/ ) has a totaly different isue, though! That script was obviously written for Oracle7 or earlier and will not work in Oracle 8.0 or any later release, since starting with Oracle8 the view V$INSTANCE has totaly different structure. With Oracle7 you allways got more than one row from it and hence the WHERE clause in that script.

[prakashs43]

Thanks a lot .

[julian]

Originally posted by jmodic
You can definitely have more than one record returned from V$INSTANCE, but only if you are having paralel server (OPS/RAC) configuration on that database.

Jurij, are you telling him that in OPS/RAC, after you issue

select * from v$instance;

then you will have more than 1 record returned? If so, then this is not true.

[soniaarora]

I am working on OPS -database having 2 instances.
v$instance shows only one record -the details of the current instance in which u r in.

[jmodic]

Yes, my bad.

V$INSTANCE returns only one row even with OPS/RAC (in 8.0 and above). That's normal since it has "... where inst_id = USERENV('Instance')" condition built in. What I was reealy talking about was view GV$INSTANCE - this lists all the instances that have database mounted.

Sorry for the confusion.

[julian]

Originally posted by jmodic
Yes, my bad.

V$INSTANCE returns only one row even with OPS/RAC (in 8.0 and above). That's normal since it has "... where inst_id = USERENV('Instance')" condition built in. What I was reealy talking about was view GV$INSTANCE - this lists all the instances that have database mounted.

Sorry for the confusion.

I suspected you meant GV$INSTANCE:

SQL>  select * from gv$instance;

   INST_ID INSTANCE_NUMBER INSTANCE_NAME    HOST_NAME           
---------- --------------- ---------------- -------------------
         1               1 ADS01            fim420-01           
         2               2 ADS02            fim420-02           

SQL>

[prakashs43]

Hi ,

select * from v$instance ; retireves 1 record
select * from gv$instance also returns 1 record in RAC .

may be it retrieves more records in OPS .

prakash