Simple .NET/ASP.NET PDF document editor web control SDK

The V$SGA view is useful in determining how much total memory is allocated to the various components of the SGA. The following simple query gives you a summary of the SGA memory usage by the current instance: SQL> SELECT * FROM V$SGA; NAME VALUE -------------------- ---------Fixed Size 453492 Variable Size 109051904 Database Buffers 25165824 Redo Buffers 667648 SQL> In the preceding code, Variable Size includes the shared pool memory and Database Buffers refers to the buffer cache component. Redo Buffers is the redo log buffer cache.

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A copy constructor of a native type N must have exactly one argument of either N& or const N& Likewise, a copy constructor of a ref class R must have an argument of type R% or const R% auto_ptr s copy constructor is implemented as follows: auto_handle(auto_handle<_element_type> % _right ) : m_handle( _rightrelease() ) { } _element_type ^ release() { _element_type ^_tmp_ptr = m_handle; m_handle = nullptr; return _tmp_ptr; }.

The V$SGASTAT view gives you a detailed breakdown of the SGA memory. It shows you current memory allocations broken down into the following main areas: Fixed_sga Buffer_cache

Log_buffer Shared_pool Java_pool Large_pool Streams_pool The V$SGASTAT view breaks down the memory allocation into various subcomponents for the last four items in the preceding list. Thus, you can look up the V$SGASTAT view and see how much free memory there is, for example, in the shared pool, by using the following query. The query results reveal that about 45MB of free memory is in the shared pool: SQL> SELECT bytes from v$sgastat 2 WHERE pool='shared pool' and 3 V$SGA name='free memory'; BYTES ---------45340344 SQL>

In this case the user just wants to receive a simple flat file, which will be mailed back to the requester. Another improvement to this script would be to use the file command to first check the type of file that is being requested to make sure it is being processed correctly.

The V$SGA_DYNAMIC_COMPONENTS view lets you find out details about the memory granule sizes and the minimum and maximum size of the SGA. Here s the output of a query using this dynamic view: SQL> SELECT component,min_size, max_size, 2 granule_size,current_size 3* FROM V$SGA_DYNAMIC_COMPONENTS; COMPONENT MIN_SIZE MAX_SIZE GRANULE_SIZE CURRENT_SIZE ------------------------------------------------------------------shared shared pool 1442840576 0 16777216 1442840576 large pool 16777216 0 16777216 16777216 java pool 67108864 0 16777216 67108864 streams pool 0 0 16777216 0 DEFAULT buffer cache 2466250752 0 16777216 2466250752 KEEP buffer cache 0 0 16777216 0 RECYCLE buffer cache 0 0 16777216 0 DEFAULT 2K buffer cache 0 0 16777216 0 DEFAULT 4K buffer cache 0 0 16777216 0 DEFAULT 8k buffer cache 0 0 16777216 0 DEFAULT 16K buffer cache 0 0 16777216 0 DEFAULT 32K buffer cache 0 0 16777216 0 OSM Buffer Cache 0 0 16777216 0 13 rows selected. SQL>

Oracle automatically applies the necessary locks to the tables and other objects based on the transactions that are coded in the applications. Oracle s locking mechanism works automatically to ensure statement-level read consistency and concurrency. For the most part, Oracle s default, behind-the-scenes locking operations should suffice, but there occasionally may be situations when the application developer will be better off manually locking tables. Sometimes when the transaction needs to see consistent data across many joined tables, the application developer can use explicit locking. In addition, when you don t want the data values changed during long transactions, it may sometimes be necessary for the application developer to apply explicit locks. Oracle provides explicit locking features to override the implicit locks placed by Oracle on behalf of transactions. You can override Oracle s default (implicit) locking mechanism at the transaction level or the session level. If you want to override all Oracle s default locking mechanisms, you can do so by using the SET TRANSACTION ISOLATION LEVEL SERIALIZABLE statement at the session level. The same statement will also override the default locking modes at the transaction level. In addition, you can manually lock a table by explicitly using a table lock or by using the SELECT FOR UPDATE command.

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