iorewforce.blogg.se - Sl cache viewer x object

SELECT * FROM GV$LOCK WHERE INST_ID = 2 OR INST_ID = 5 The INST_ID column can be used as a filter to retrieve V$ information from a subset of available instances. The INST_ID column displays the instance number from which the associated V$ view information was obtained. In addition to the V$ information, each GV$ view possesses an additional column named INST_ID with type integer. In a parallel server environment, querying a GV$ view retrieves the V$ view information from all qualified instances. For each of the V$ views described in this chapter (with the exception of V$CACHE_LOCK, V$LOCK_ACTIVITY, V$LOCKS_WITH_COLLISIONS, and V$ROLLNAME), there is a GV$ view. In Oracle, there is an additional class of fixed views, the GV$ (Global V$) fixed views. Warning: Information about the dynamic performance views is presented for completeness only this information does not imply a commitment to support these views in the future. Views that read data from disk require that the database be mounted. Suggestion: Once the instance is started, the V$ views that read from memory are accessible. The dynamic performance views are used by Enterprise Manager and Oracle Trace, which is the primary interface for accessing information about system performance. Database administrators or users should only access the V$ objects, not the V_$ objects. Public synonyms for these views have the prefix V$. You must run CATALOG.SQL to create these views and synonyms.ĭynamic performance views are identified by the prefix V_$.

The file CATALOG.SQL contains definitions of the views and public synonyms for the dynamic performance views. These views can be selected from, but never updated or altered by the user. These views provide data on internal disk structures and memory structures.

These views are called dynamic performance views because they are continuously updated while a database is open and in use, and their contents relate primarily to performance.Īlthough these views appear to be regular database tables, they are not. The Oracle Server contains a set of underlying views that are maintained by the server and accessible to the database administrator user SYS.

View Descriptions Dynamic Performance Views.

The following topics are included in this chapter: If both are MISS(es) then the request by the client doesn't have any valid object corresponding to the request.This chapter describes the dynamic performance views, which are also known as V$ views. Pragma: no-cache (in HTTP/1.0) and Cache-Control: no-cache This is hard refresh, which can be simulated by Ctrl + F5 or by sending headers: In case X-Cache is MISS and X-Cache_Lookup is HIT, then the client made a request that had a cache-able response but was forced by the client to bypass the cache. X-Cache-Lookup represents if the proxy has a cache-able response to the request (HIT for yes and MISS for no)īoth HITs means that the client has made a cache-able request and the proxy had a cache-able response that matched, and was forwarded back to the client. X-Cache corresponds to the result, whether the proxy has served the result from cache (HIT for yes, and MISS for no) One of security, and other of caching more frequent web pages (in order to limit network traffic). Organizations and universities place proxy (squid) servers between their and A common place to find these header fields is in squid servers. Also its meaning vary from one proxy implementation to another. Prefix 'X' in X-Cache indicates that the header is not a standard HTTP Header Field.