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Everything a DBA Should Know about

TCP/IP Networks

Chen (Gwen) Shapira

http://prodlifewordpre!!"o#

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$y Storie!

%&A'*+* on "onne"tion to &AC

,ob doe! not -ni!h running

&eading $ row! Copying redo log! to D& !ite

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.ill Show

Colle"t hard data Don0t gue!!

.hen 1 .hat to tune

Ba"2 of the envelope "al"ulation!

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%&A'*+* Conne"ting to

&AC

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.hy gue!! when you "an

Capture?

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3 want to"onne"t

Go to that!erver4 Bye4

Go where555

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Solution!

6i7 8%CA8983SE;E&

6i7 D;S

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Bat"h ,ob ;ever 6ini!he!

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Capture on bothClient 1 Server

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&un thi!

pro"edure

ACK4

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.aiting

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he -rewall i! eating #y pa"2et!

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Solution!

al2 to networ2 ad#in

Con-gure S?8;EE@3&E93$E

Con-gure t"p92eepalive9ti#e

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Give $e $ &ow! ASA

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Start with .ait Event!

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S?8;et $e!!age to"lient'

Meaningless

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S?8;et $e!!age from"lient'

Nearly Meaningless

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Do the nu#ber! #a2e!en!e5

Byte! Sent

i#e

&oundtrip!

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une the ArraySie

%r !et6et"hSie()

.ith $ row!:

6et"h F &oundtrip!

6et"h * F + &oundtrip!

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(Don0t) une SDH

%ra"le0! buIer K or JK

Can !et to #a7 K

Can !et to #ultiple of +LM byte

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Beware:Co#pul!ive uningDi!order

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Get &edo 8og! to D& Site

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?: Bandwidth5

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%CKEF(**$b/!EF

NLDG/hourEFNMDGwithheader!

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Key proble#:

8ine utiliation

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?: 8aten"y5

;Sing &oundtrip ti#e *#!

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Data O(*byte!

ACK* #!

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Data O(*byte!

ACK

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(**$b/!*DD#!E

PM$Byte!

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Adverti!ed .indow!

net"orew#e#9default

net"orew#e#9#a7

net"orer#e#9default net"orer#e#9#a7

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Conge!tion .indow

.indowSiCe

i#e

Error!

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.A; A""elarator

$

$$

$

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&e#e#eber

Colle"t hard data Don0t gue!!

.hen 1 .hat to tune

Ba"2 of the envelope "al"ulation!

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Questions?