Disk Structures and Storage

In This Chapter

The database server achieves its high performance by managing its own I/O. The database server manages storage, search, and retrieval. As the database server stores data, it creates the structures it needs to search for and retrieve the data later. The database server disk structures also store and track control information needed to manage logging and backups. Database server structures contain all the information needed to ensure data consistency, both physical and logical.

Before you read this chapter, familiarize yourself with the disk-space terms and definitions in the chapter on where data is stored in the HCL Informix® Administrator's Guide.

This chapter discusses the following topics related to disk data structures:
  • Dbspace structure and storage
  • Storage of simple large objects
  • Sbspace structure
  • Time stamps
  • Database and table creation: what happens on disk

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