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The Immigration and Naturalization Service (INS) of the United States government created a new $36 million Student and Exchange Visitor Information System (SEVIS) to replace the old paper-based methods the INS had used for years to track foreign students in US educational institutions More than 5,400 high schools, colleges, and universities have to use SEVIS to enter the necessary information about enrolled students from other countries The INS had imposed a deadline of January 31, 2003, by which all educational institutions had to switch over fully to the SEVIS system However, it extended the deadline by at least two weeks amid several complaints about the system working slowly, if at all Here are a few of those complaints from users across the country: Some employees in Virginia could enter data only in the mornings, before the West Coast institutions logged onto the system.

In the afternoons, the system slowed to a crawl From the University of Minnesota came complaints that that the officials were completely unable to use the system at all The users mentioned that the system was really jammed with users trying to get on They also complained that the system was unbelievably slow An INS spokesperson admitted that the system had been somewhat sluggish and that schools were having trouble using the SEVIS system The University of North Carolina complained that the situation, if it continued any further, was going to be a real nightmare and that it was already starting to cause some problems One worker at a college in Michigan was quoted as saying this in frustration: Please tell me what I m doing wrong, or I am going to quit.

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Instead of maintaining the list of blocks in some physical order, Oracle employs a touch count algorithm, which effectively increments a counter associated with a block as you hit it in the cache This count is not incremented every time you hit the block, but about once every three seconds if you hit it continuously You can see this algorithm at work in one of the truly magic sets of tables: the X$ tables The X$ tables are wholly undocumented by Oracle, but information about them leaks out from time to time The X$BH table shows information about the blocks in the block buffer cache (which offers more information than the documented V$BH view) Here, we can see the touch count get incremented as we hit blocks.

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The INS realized the colleges and universities weren t going to meet the deadline, and they announced a grace period after saying that upgrades to the system had greatly improved performance Behind the SEVIS system is an Oracle database that was performing awfully slowly The system apparently couldn t scale well enough When a large number of users got on, it ground to a halt Obviously, the system wasn t configured to handle a high number of simultaneous operations Was the shared server approach considered, for example How were the wait statistics I don t know the details I do know that the Oracle database is fully capable of meeting the requirements of an application such as this I picked this example to show that even in high-profile cases, DBAs sometimes have to eat humble pie when the database isn t tuned properly and consequently performance doesn t meet expectations..

Most of the instance tuning that DBAs perform is in response to a poorly performing database. The following sections present a brief summary of how you can start analyzing the instance to find out where the problem lies. First, examine all the major resources such as the memory, CPUs, and storage subsystem to make sure your database isn t being slowed down by bottlenecks in these critical areas.

We can run the following query against that view to find the five currently hottest blocks and join that information to the DBA_OBJECTS view to see what segments they belong to The query orders the rows in X$BH by the TCH (touch count) column and keeps the first five Then we join the X$BH information to DBA_OBJECTS by X$BHOBJ to DBA_OBJECTSDATA_OBJECT_ID: sys@ORA10G> select tch, file#, dbablk, 2 case when obj = 4294967295 3 then 'rbs/compat segment' 4 else (select max( '('||object_type||') ' || 5 owner || '' || object_name ) || 6 decode( count(*), 1, '', ' maybe!' ) 7 from dba_objects.

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