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An Oracle process in memory has several components: Shared memory: This is the SGA that you re so familiar with. The executable: Also known as TEXT, this component consists of the machine instructions. The TEXT pages in memory are marked read-only. Private data: Also called DATA or heap, this component includes the PGA and the User Global Area (UGA). The DATA pages are writable and aren t shared among processes. Shared libraries: These can be private or public. When a new process starts, it requires only the DATA (heap) memory allocation. Oracle uses the UNIX implementation of shared memory. The SGA and TEXT components are visible to and shared by all Oracle processes, and they aren t part of the cost of creating new Oracle processes. If 1,000 users are using Oracle Forms, only one set of TEXT pages is needed for the Forms executable. Unfortunately, most operating system tools such as ps and top give you a misleading idea as to the process size, because they include the common shared TEXT sizes in individual processes. Sometimes they may even include the SGA size. Solaris s pmap and HP s glance are better tools from this standpoint, as they provide you with a more accurate picture of memory usage at the process level.

A large system with lots of concurrent transactions could benefit somewhat from large redo log buffers because while LGWR (the process responsible for flushing the redo log buffer to disk) is writing a portion of the log buffer, other sessions could be filling it up In general, a long-running transaction that generates a lot of redo log will benefit the most from a larger than normal log buffer, as it will be continuously filling up part of the redo log buffer while LGWR is busy writing out some of it The larger and longer the transaction, the more benefit it could receive from a generous log buffer The default size of the redo buffer, as controlled by the LOG_BUFFER parameter, is whatever is the greater of 512KB and (128 * number of CPUs)KB The minimum size of this area is OS dependent.

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Even after processes free up memory, the operating system may not take the memory back, indicating larger process sizes as a result.

If you would like to find out what that is, just set your LOG_BUFFER to 1 byte and restart your database For example, on my Red Hat Linux instance I see the following: sys@ORA10G> alter system set log_buffer=1 scope=spfile; System altered sys@ORA10G> startup force ORACLE instance started Total System Global Area 1593835520 bytes Fixed Size 779316 bytes Variable Size 401611724 bytes Database Buffers 1191182336 bytes Redo Buffers 262144 bytes Database mounted Database opened sys@ORA10G> show parameter log_buffer NAME TYPE VALUE ------------------------------------ ----------- -----------------------------log_buffer integer 262144 The smallest log buffer I can really have, regardless of my settings, is going to be 256KB on this system..

As a result of the problems you saw in the previous section, it s better to rely on Oracle itself for a true indication of its process memory usage. If you want to find out the total DATA or heap memory

When multiple objects collaborate to achieve a goal, there is interaction between them. UML 2 has two diagrams to model interactions: Sequence diagrams and Communication diagrams. I ll describe the latter in the next section. Sequence diagrams use vertical lines, called lifelines, that represent the participants of an interaction, with time increasing in the downward direction, as shown in Figure 6-10.

size (the biggest nonsharable process memory component), you can do so by using the following query: SQL> SELECT value, nname|| '('||sstatistic#||')', sid FROM v$sesstat s, v$statname n WHERE sstatistic# = nstatistic# AND nname like '%ga memory%' ORDER BY value; If you want to find out the total memory allocated to the PGA and UGA memory together, you can issue the command in the next example The query reveals that a total of more than 367MB of memory is allocated to the processes Note that this memory is in addition to the SGA memory allocation, so you need to make allowances for both types of memory to avoid paging and swapping issues SQL> SELECT SUM(value) FROM V$SESSSTAT s, V$STATNAME n WHERE sstatistic# = nstatistic# AND nname like '%ga memory%'; SUM(VALUE) --------------3674019536 1 row selected.

So far, we have looked at relatively small components of the SGA Now we are going to look at one that is possibly huge in size The block buffer cache is where Oracle stores database blocks before writing them to disk and after reading them in from disk This is a crucial area of the SGA for us Make it too small and our queries will take forever to run Make it too big and we ll starve other processes (eg, we won t leave enough room for a dedicated server to create its PGA, and we won t even get started) In earlier releases of Oracle, there was a single block buffer cache, and all blocks from any segment went into this single area Starting with Oracle 8.

SQL> If the query shows that the total session memory usage is growing abnormally over time, you might have a problem such as a memory leak A telltale sign of a memory leak is when Oracle s memory usage is way outside the bounds of the memory you ve allocated to it through the initialization parameters The Oracle processes are failing to return the memory to the operating system in this case.

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