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As the preceding query and its output show, user Nicholas has locked up the Employees table. If this is preventing other users from accessing the table, you have to remove the lock quickly by killing the locking user s session. You can get the locking user s SID from the session_id column in the preceding output, and the V$SESSION view gives you the SERIAL# that goes with it. Using the ALTER SYSTEM KILL . . . command, you can then kill the offending session. The same analysis applies to a locked index, which prevents users from using the base table. For example, an attempt to create an index or rebuild it when users are accessing the table can end up inadvertently locking up the table. If there s a table or index corruption, that could cause a problem with accessing that object(s). You can quickly check for corruption by running the following statement:

On occasion, there might be a problem because of an alarming increase in the size of one or more Oracle processes. You have to be cautious in measuring Oracle process size, because traditional UNIX-based tools can give you a misleading idea about process size. The following sections explain how to measure Oracle process memory usage accurately.

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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.

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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.

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 size (the biggest nonsharable process memory component), you can do so by using the following query: SQL> SELECT value, n.name|| '('||s.statistic#||')', sid FROM v$sesstat s, v$statname n WHERE s.statistic# = n.statistic# AND n.name 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.

The number of logical I/Os is 6. Note that the number of logical I/Os has decreased as the fetch size has increased. The relevant portion of the tkprof output for _demoCstmtFetchSize() is as follows: select /*+(CONN=5)(CSTMT=20)*/x from t1 where rownum <= :p_fetch_size call count ------- -----Parse 1 Execute 1 Fetch 21 ------- -----total 23 cpu elapsed disk query current -------- ---------- ---------- ---------- ---------0.00 0.00 0 0 0 0.01 0.01 0 0 0 0.01 0.02 0 23 0 -------- ---------- ---------- ---------- ---------0.03 0.03 0 23 0 rows ---------0 0 100 ---------100

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