PPT Slide

Fork() Characteristics:

• Forked process inherits charactersfrom its parent

• Forked process has its own SR5

• Duplicate some file system data structures and share some

• Runtime Control Block (DBUX/DBU)

  • Not able to duplicate file system data structure of DBUX and DBU
  • Many fields not suitable for sharing
  • State of the process while forking

• Global Variables

  • qlock_trace
  • bti_global
  • ccu_global
  • chunk_control

• Open Files

  • except rootfile, not using file system intrinsics
  • maintain own current record pointers
  • use SMCB

Problems for forking:

• fork() will fail if DB opened

• Runtime control block

• Global variables

• Open files

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