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| Case | Query one out of many using descendant cps path | Query one out of many using absolute cps path |
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| Query | //openroadm-device[@device-id="C201-7-1A-14"] | /openroadm-devices/openroadm-device[@device-id="C201-7-1A-19"] |
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Time complexity of | O(N) | O(N) |
| Time complexity of proposed solution | O(N) | Near-constant, O(1) |
| Comments | The use of LIKE 'openroadm-device[%' in the query to match candidates | The use of the absolute path narrows the search space to only direct children of /openroadm-devices - for 3000 devices, we only need to scan 3000 fragments instead of 250k. (Technically this is still O(N), but linear on the number of items in the list, not the number of fragments in the DB.) |
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Presently, only case 1 will return data (because 'code' is the list key for 'categories'), and cases 2 and 3 return nothing. Given the proposed solution uses an SQL sub-query for each path-component, the query generator can be adapted to support cases 2 and 3, with no little expected performance impact. Note this feature would require storing the container/list name as an indexed field, as described in the previous section.
Other operations can be accelerated
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