TheITindustryisconstantlyevolvingwiththeintroductionofnewtechnologies.Whileitisimportanttokeepupwithadvancements,maintaininglegacysystemsisequallynecessarytoensurethattheinfrastructureofyourorganizationfunctionstothebestofitsability.Soundknowledgeoftechniquesthatcanbeusedformaintaininglegacysystemscanhelpyouavoidcommonpitfalls.Thebookbeginswithaquickoverviewofwhatareallegacysystemlookslike,howitworks,andcommonissuesthatmaybefacedwhentryingtomaintainingit.You'llthenexplorethearchitectureofalegacysystemindetailandunderstandeachofitscomponents.Asyouprogress,you'lldiscoveravarietyoftechniquesforanalyzingalegacysystemandhowtoapplythem.Onceyougettogripswiththesecurityconstraintsassociatedwithlegacysystems,you'llexplorewaystosecurethem.Finally,you'llbeabletoeasilymakechangesinlegacysystemstoenhancetheirperformance.Bytheendofthisbook,you'llhavedevelopedtheskillsandconfidencetoworkwithlegacysystemsandefficientlymaintainthem.