GDS organizes the B-tree into logical blocks, each of which GT.M handles discretely. A block consists of a block header and a lexically increasing sequence of records. Blocks starting with the root block up to the data blocks are index blocks. The last block in any complete path is a data block. The errors discussed in this section indicate a damaged block.

Determine if the block has other problems by using the DSE command INTEGRIT. Examine the contents of the block using the DSE command DUMP. You may also examine the block preceding this block in the path and/or blocks pointed to by records in this block. If you can determine an appropriate action, use CHANGE with the BSIZ= and/or LEVEL= qualifiers. If you cannot quickly repair the block, examine its level with DUMP HEADER. If the block is a data block, that is, level zero (0), refer to section O3. If the block has a level greater than zero (0), REMOVE the record that points to the block and refer to section O4.