Structure of the Metadata Area

As with the chunk header pages, four areas are exclusive to the first chunk in a sbspace: the sbspace descriptor tblspace, the chunk adjunct tblspace, and the level-1 and level-2 archive tblspaces. The tblspace header section contains a tblspace header for each of these tblspaces (notably excluding the tblspace tblspace). Figure 20 shows the layout of the metadata in the single-chunk sbspace.

Figure 20. Structure of the Metadata Area for a Single-Chunk Sbspace

When you specify the sbspace name in the oncheck -ps option, you can display the number of pages allocated and used for each tblspace in the metadata area.

The following describes how the metadata area grows:

• The sbspace descriptor tblspace does not grow.
• The chunk adjunct tblspace grows as chunks are added.
• The LO header tblspace grows as chunks are added.
• The tblspace for user-data free list grows if free spaces in the chunk are heavily fragmented.