IBM 000-8697 Manuale Utente

IBM Informix OnLine Database Server Administrator’s Guide

In the final section,

configuration-changing

actions are divided into eight categories, according to the area of OnLine that
is affected:

■

Blobspaces (creating or dropping)

■

Buffers (changing the size of the logical or physical log buffer, or
changing the number of buffers in the shared-memory buffer pool)

■

Chunks (adding a chunk or changing its status)

■

Dbspaces (creating or dropping)

■

Forced residency (on or off, temporarily or for this session)

■

Mirroring (starting or ending, taking down or restoring a chunk)

■

Physical log (changing the location or size)

■

Shared-memory parameters (changing the values)

Changes associated with the logical log files or archive administration are
addressed separately under those topics. Performance tuning is discussed in

This section defines the OnLine operating modes, and provides instructions
for moving from one mode to another.

OnLine has five modes of operation:

■

Offline mode

■

Quiescent mode

■

Online mode

■

Shutdown mode

■

Recovery mode

The last two modes, shutdown and recovery, are transitory and indicate that
OnLine is moving from one mode to another.