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begin dbms_stats.set_system_stats('MBRC',6.59); dbms_stats.set_system_stats('MREADTIM',10.001); dbms_stats.set_system_stats('SREADTIM',10.000); dbms_stats.set_system_stats('CPUSPEED',1000); end; / I have set the MBRC to 6.59 because that corresponds to the adjusted value that the optimizer uses to cost tablescans (and index fast full scans) when the db_file_multiblock_read_count is set to my usual test value of 8. I have then set the mreadtim and sreadtim to be (virtually) identical which is one of the basic assumptions of the older I/O costing algorithms used by the optimizer. The scripts then generate an SQL script that calls a third SQL script (has_dump.sql or pat_dump.sql depending on the driving script) many times.

The strategic implementation of time-critical code as C, with the help of Inline::C, can allow a programmer to have all the power of Perl and its modules available, and at the same time be able to achieve the speed and performance that can make the difference between a failed and successful project.

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I could run back and forth and say, The professor at the other end of the river says this And this one will say, Oh, he s full of it; here s the way you should think about it That gave me a very broad education, very quickly Having access to MIT as a high schooler was another relatively unusual thing And to be allowed to play with million-dollar computers when I was 15, back when a million dollars was real money So no, I certainly don t have any complaints or regrets or wishes that I had done anything differently I also tend to be a laid-back kind of guy and to take things as they come..

Caution The mechanism of scripts writing scripts then calling them is one that I consider to be extremely

In this chapter we have seen how we can access and manipulate the values of individual pixels in an image. We ve discussed some techniques for which this can be useful, and noticed that Perl is, by itself, not always fast enough to implement algorithms that require modification of individual pixels. However, with a smattering of C knowledge and the Inline modules, this problem can be solved.

Jamie Zawinski But then the question is, well, what happens when the assertion fails and you re in production code; what do you do And we sort of decided that what you do is return zero and hope it keeps going Because having the browser go down is really bad it s worse than returning to the idle loop and maybe having leaked a bunch of memory or something That s going to upset people less than the alternative A lot of programmers have the instinct of, You ve got to present the error message! No you don t No one cares about that That sort of stuff is a lot easier to manage in languages like Java that actually have an exception system Where, at the top loop of your idle state, you just catch everything and you re done.

The scripts that use manual hash_area_size allocation contain a line like this one: alter session set hash_area_size = &2; The scripts that use automatic hash_area_size allocation i.e., the ones that have workarea_size_policy set to automatic and rely on the pga_aggregate_target to control the hash_area_size contain a line like the following: alter system set pga_aggregate_target = &2 scope = memory; All the called scripts enable the 10053 trace and the 10104 trace, and use the tracefile_identifier to make sure that each test generates its own suitably named trace file for example: alter session set events '10053 trace name context forever, level 2'; alter session set events '10104 trace name context forever'; alter session set tracefile_identifier = 'pat_&1._&2';

In this chapter we ve had a look at dynamically creating graphical content for the web. We have also discussed the (currently) most appropriate graphical formats for the web. And finally, we ve had a look at some ways to automatically create static content in this particular case, image directories, for display on a web site.

No need to bother the user with telling them that some value was zero Seibel: Did you ever just step through a program either to debug it or, as some people recommend, to just step through it once you ve written it as a way of checking it Zawinski: No, not really I only really do stepping when I m debugging something I guess sometimes to make sure I wrote it right But not that often Seibel: So how do you go about debugging Zawinski: I just eyeball the code first Read through it until I think, well, this can t happen because that s going on right there And then I put in something to try and resolve that contradiction Or if I read it and it looks fine then I ll stop in the middle or something and see where it is It depends.

Note For a less resource intensive, though less informative, approach, I have also written four scripts that

It s hard to generalize about that Seibel: As far as the assertions how formally do you think Some people just use ad hoc assertions here s something that I think should be true here And some people think very formally functions have preconditions and postconditions and there are global invariants Where are you on that scale Zawinski: I definitely don t think about things in a mathematically provable way I m definitely more ad hoc than that You know, it s always helpful when you ve got inputs to a function to at least have an.

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