HP OpenVMS System Manager's Manual, Volume 2:...

Managing the Vector Processing Environment (VAX Only)

Understanding Transaction Logs

On OpenVMS Alpha or I64 systems, unpredictable resultscan occur if DECdtm services are used in a multithreaded environment.Do not make calls to DECdtm services in kernel threads other thanthe initial thread because much of the work performed by DECdtmuses the context of the calling process.

Task	Section
Planning transactionlogs	Planning Transaction Logs
Planning fora DECnet-Plus network	Planning for a DECnet-Plus Network
Creating transactionlogs	Creating Transaction Logs
Monitoringtransaction performance	Monitoring Transaction Performance
Checking whethera transaction log is too small	Checking Whether a Transaction Log Is Too Small
Changing thesize of a transaction log	Changing the Size of a Transaction Log
Moving a transactionlog	Moving a Transaction Log
Dismountinga disk	Dismounting a Disk
Adding a node	Adding a Node
Removing anode	Removing a Node
Disabling DECdtmservices	Disabling DECdtm Services
Enabling DECdtmservices	Enabling DECdtm Services
Using the XA Gateway (Alphaand I64)	Using the XA Gateway (Alpha and I64)

The map in Managing DECdtm Services showsthe tasks, and the order in which to do them.

This chapter explains the following concepts:

Concept	Section
Understandingtransaction logs	Understanding Transaction Logs
Understanding transactiongroups	Understanding Transaction Groups

Figure 1  ManagingDECdtm Services

Understanding Transaction Logs
Planning Transaction Logs
Planning for a DECnet-Plus Network
Creating Transaction Logs
Monitoring Transaction Performance
Checking Whether a Transaction Log Is Too Small
Changing the Size of a Transaction Log
Moving a Transaction Log
Dismounting a Disk
Adding a Node
Removing a Node
Disabling DECdtm Services
Enabling DECdtm Services
Using the XA Gateway (Alpha and I64)

Managing the Vector Processing Environment (VAX Only)

Understanding Transaction Logs