DB2 UDB V8 has several new on-line database maintenance features. These features can improve both the database availability and performance.
DB2 UDB V8 introduces several new on-line maintenance features to enhance the database availability:
- In-place Reorg: Read and Write to the table is allowed while the table is being reorganized.
- On-line Index : With the REORG INDEX command, reading and writing to the table is allowed, while the index is being created;
- On-line Load: Has two modes: one occurs when the tablespace is on-line but the table being loaded is off-line;
The FixPak 4 adds another on-line maintenance feature - On-line Import. The on-line mode provides better availability of the target table and potentially increases the performance of the import utility. The import utility now supports two locking modes: off-line mode, (ALLOW NO ACCESS), and on-line mode, (ALLOW WRITE ACCESS). Off-line mode is the default.
On-line import is especially valuable when range-clustered tables (RCT) are used. Load into RCTs is not supported, and therefore performing 4 multiple concurrent imports into a single target table is the most efficient 4 way to populate the database using supported DB2 utilities.
This new feature is also supported in the API db2Import.
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