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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix®.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
R-Tree Index User's GuideThe Informix® R-Tree Index User's Guide describes the HCL Informix® R-tree secondary access method and how to access and use its components.
Manage databases that use the R-tree secondary access method
Check R-tree indexes with the oncheck utility
Check pages with the -pT option

Check pages with the -pT option

The -pT option performs standard R-tree index checks and prints out a summary of information about the index for each index fragment. In addition, this option also displays information about the indexed table.

The following example shows how to use the -pT option:

oncheck -pT rtree_db:polygons

The following example shows the type of output that oncheck -pT displays:

Tree Depth: 3
Internal Pages: 11
Leaf Pages: 125
Empty Pages: 0
Total Pages: 136
Root page items: 10
Leaf Page Tuples: 1000
Internal Page Tuples: 135
Avg. Leaf Page Tuples per Leaf Page: 8.0
Space utilization:
Total Space: 278528
Free Space: 82880
Total Page Overhead: 59028
User Data Space: 136620
User Free Space: 119380
User Page Overhead: 36500
Total: user data: 49.1%, free 29.8%, overhead 21.2%
User Pages Only: data 53.4%, free 42.9%, overhead 14.3%

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