managering shared memory.pdf

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1、Module6ManagingSharedMemoryManagingSharedMemory11-20036-1©2001,2003InternationalBusinessMachinesCorporationObjectivesAttheendofthismodule,youwillbeableto:®Listanddescribethedatabaseserveroperatingmodes®Useonmodeandoninittochangetheoperatingmode®Describetheshared-memorysegmentsusedbythedata

2、baseserver®Describetheconfigurationparametersthataffectthesizeofsharedmemory®SettheRESIDENTparametertocontrolshared-memoryresidency®Monitorthemajorcomponentsofsharedmemory6-26-2ManagingSharedMemoryServerOperatingModes¢Offline¢Initialization¢Quiescent¢Online¢Shutdown¢Recovery6-3Adatabaseser

3、vercanbeinanyoneofthefollowingoperatingmodes:OfflinemodeTheserverisnotrunning.Nosharedmemoryisallocated.InitializationmodeAninterimmodethatoccurswhentheserverisinitializedandmovingfromOfflinemodetoQuiescentmode.QuiescentmodeTheoninitprocessesarerunning,shared-memoryresourcesareallocated,bu

4、tthesystemdoesnotallowaccesstodatabaseusers.OnlinemodeThesystemisrunningandavailableforclientaccess.ShutdownmodeThesystemisrunningandcurrentusersareaccessingtheserver,butnonewusersareallowedtoconnect.RecoverymodeThesystemisperformingfastrecovery,orarestoreofthesystemfrombackupisinprocess.F

5、astrecoveryoccursduringthechangefromOfflinetoQuiescentmode.ForMoreInformationForadditionalinformationabouttheserveroperatingmodes,refertotheManagingDatabaseServerOperatingModeschapteroftheAdministrator’sGuideforIBMInformixDynamicServer.ManagingSharedMemory6-3NormalServerProcessesProcessSta

6、tusUSERPID%CPU%MEMSZRSSTTSTATSTARTTIMECOMMANDroot7370.01.9288272p1S13:050:00oninitroot7390.01.3300192p1S13:050:00oninitroot7380.01.6300232p1S13:050:00oninitroot7360.05.3300764p1S13:050:13oninitroot7400.01.8300256p1S13:050:00oninitroot7410.00.03000p1IW13:050:00oninitroot7420.01.6300224p1S13

7、:050:00oninit6-4Theserverusesseveraloninitprocessestomaintainitself.Duringnormaloperation,therearealwaysseveraloninitprocesses;oneforeachvirtualprocessorconfiguredforyourserver.Theoninitprocessesarerunasroot.Thisisnecessarytoallowthevirtualprocessortoruntasksa