When you connect to the Oracle database, anything that has the DATE datatype, is displayed in the default format of DD-MON-YY, and no time component. There are multiple ways to see the time component of a DATE column, in sqlplus. You can either alter your session to set the date format, or you can use a function in your select statement to alter the format of the column. alter session set nls_date_format = 'DD/MM/YYYY HH24:MI:SS' ; select sysdate from dual; SYSDATE ------------------- 12/01/2022 20:19:06 select to_char(sysdate, 'DD-MON-YY HH24:MI:SS' ) from dual; TO_CHAR(SYSDATE,'D ------------------ 12-JAN-22 20:19:50 How about RMAN? How can you see the date and time a backup completed or started? By default you only see the same format as in sqlplus: DD-MON-YY. This format is not always enough. You try an alter session command in RMAN (same as above), and it doesn’t work. Instead, what is the solution? You must set the NLS_DA...
Architecture : Basic Memory Structures Oracle Database includes several memory areas, each of which contains multiple subcomponents. The basic memory structures associated with Oracle Database include: · System global area (SGA) The SGA is a group of shared memory structures, known as SGA components , that contain data and control information for one Oracle Database instance. All server and background processes share the SGA. Examples of data stored in the SGA include cached data blocks and shared SQL areas. · Program global area (PGA) A PGA is a nonshared memory region that contains data and control information exclusively for use by an Oracle process. Oracle Database creates the PGA when an Oracle process starts.One PGA exists for each server process and background process. The collection of individual PGAs is the total instance PGA, or instance PGA . Database ...
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