ISP Information:
A person whose job it is to manage databases. A DBA's tasks may include assigning security privileges to the databases, creating and designing databases, and controlling the importing and exporting of data between databases and external sources. The creation and design of databases is a science. You can increase or decrease performance greatly by designing a database properly or improperly.
ISP Glossary:
DataBase Administrator - On 19 Oct 2003 19:48:20 -0700, buyer262000@yahoo.com (TAB) put fingerto keyboard and composed: I hope John Navas is watching. ;-)I have to ask, what is the story with this fellow? (I'm new Isuppose).Go to groups.google.com for the answer. :-)The reason I mentioned his name is that he accused me of lying when Iclaimed that my internal modem was able to achieve in excess of 20KBpstransfer rates when downloading NG headers. Your results appear tocorroborate my own. I'd expect a best rate of 115200bps, ie a speed limited only by your port rate.What confuses me is that compressed files download noticably faster,but uncompressed seem to download slower. Really strange (at leastfrom my viewpoint).I find it strange, too. What I would do to narrow down the source ofthe "problem" is to determine the absolute maximum transfer rates ofyour hardware by saturating your COM port with an infinitelycompressible file. To do this, create a large (eg 1MB) file consistingof a single character repeated ad infinitum. Then email it or ftp itto yourself. Your Courier would probably be limited to 11.5KBps inboth directions, whereas your winmodem would probably have a muchhigher performance ceiling. I would also look for serial overrun,buffer overrun, and CRC errors in both your modemlog and ppplog. Yourwinmodem will probably show zero errors, while the Courier should havequite a few.Web Browsing is noticably snappier. Downloading binaries is also much moreconsistent/fast.I've decided I prefer the Courier because it does (even according tomy wife), browse the internet faster. It also downloads compressedfiles admirably.I was just curious about it's newsgroup header performance. This modem(the Courier) I had working it 3 minutes with an old Redhat 6.1install, where I could never figure out the Lucent one. . . (even withdrivers from Agere). . . Assuming both modems connect with V.42/V.42bis I can't see why there would be this discrepancy. Would it have something to do with dictionary size???Yes, I have checked the logs of both modems, and they both areconnecting with V.42. What is the 'dictionairy' thing you mention?My understanding is that a "dictionary" is an area of modem memory(usually 1KB or 2KB?) used by the compression algorithm to storerepetitive patterns of bytes. For example, let's say your data has astring such as ABCABCABCABC. These 12 bytes could be represented inshorthand by a notation such as 4X where X is a single byte reprentingthe string "ABC". A lookup table of such relationships could be storedin the dictionary. A larger dictionary would store a larger lookuptable, and would therefore result in a more efficient compressionscheme. Note that the example I have used is for illustrative purposesonly. I'm sure the actual compression algorithm works a lotdifferently.Also, to the other gentleman that suggested that I try 'softwarecompression' instead of hardware compression, you would not be able totalk me through this would you in W2k dial up networking?Software compression, if supported by your ISP, would make the issueof hardware compression moot.- Franc Zabkar--Please remove one 's' from my address when replying by email.
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