SELECT the view is long - select on the short view definition.

Hello everyone-

There is a view in Oracle called V$ LOCK.

If I do a number or a select on this point of view I get a result * 45 seconds *.

There are about 77 records.

However - if I do a select statement or a statement on the definition of the view (found in V$ FIXED_VIEW_DEFINITION)
I get a result without delay. Immediately.

I'm registered consequence "sqlplus / as sysdba"

What is going on??? My feable brain can't understand!

Thanks for any help,

BB

>
There is a view in Oracle called V$ LOCK.
>
On 11.2, is not correct. A query on "select * from dba_synonyms, where synonym_name like"% LOCK"shows"

V$ _LOCK-ONLINE V_$ _LOCK
V$ LOCK => V_LOCK
GV$ _LOCK-ONLINE GV_$ _LOCK
GV$ LOCK => GV_$ LOCK

And a query on "SELECT * FROM DBA_OBJECTS WHERE OBJECT_NAME LIKE"% % LOCK"shows"

GV_$ LOCK-VIEW ONLINE
GV_$ _LOCK-VIEW ONLINE
V_$ LOCK-VIEW ONLINE
V_$ _LOCK-VIEW ONLINE

V$ LOCK is a synonym. And you may be questioning the proper underlying display for each of your requests, but sometimes the queries may not be on the view as you think they are.
>
If I do a count or a select on this point of view I get a result in 45 seconds.

There are about 77 records.

However - if I do a select statement or a statement on the definition of the view (found in V$ FIXED_VIEW_DEFINITION)
I get a result without delay. Immediately.
>
We will see the first time you query data (when maybe there nothing in the cache) it is slower than the second time that you query the same data (when maby there is something in the cache)?

This is not unusual.
>
Well - that's interesting. Still it took 11 seconds to 15 records!
>
Reviews? There isn't any "writings." The V$ s are 'dynamic' performance not the tables view (s). And read consistency is not guaranteed for them. Data are updated continuously so if there is no update will not change the data in the view and based on the data display data updates can barely change.

It is unlikely that much, changed data, between your two queries.

See "views of dynamic Performance" in the doc database
http://docs.Oracle.com/CD/B28359_01/server.111/b28320/dynviews_1001.htm#i1398692
>
Oracle contains a set of views underlying which are maintained by the database server and accessible to the administrator database SYS user. These views are called dynamic views because performance that they are continually being updated when a database is open and in use and their content are mainly related to the performance.

Although these views seem to be normal database tables, they are not. These views provide data on internal disk structures and memory.
You can choose from these points of view, but you can never update or change.
>
See the NOTE just below (as well as the section dealing with the V$ and the GV$ views)
>
Because the information contained in the views V$ dynamic, coherent reading is not guaranteed for SELECT on these points of view operations.

Tags: Database

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