| 摘要 |
Apparatus, systems, and methods may operate to retrieve at least a portion of a first database query plan comprising a first tree and at least a portion of a second database query plan comprising a second tree. Further activities may include comparing relations and operations in the first tree and the second tree to identify differences. The differences may be found in the join order of the relations, and/or deleted, inserted, updated, or swapped ones of the operations based on operation signatures. Potential regression in query plan performance based on the differences may be indicated using a visual and/or audible alarm, and the differences may be published. Additional apparatus, systems, and methods are disclosed.
|
