Changes between Version 2 and Version 3 of OtherTopics

Timestamp:

07/08/26 21:15:23 (4 days ago)

Author:

231118

Comment:

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OtherTopics

@@ -16 +16 @@
 * '''Before Index Creation:'''
   * Plan Output: `Seq Scan on network_connections nc` (The engine is forced to perform an expansive sequential evaluation across log records).
+  * Execution Time: 18.383 ms
 [[Image(ss1_before.png)]]
 
 * '''After Index Creation:'''
-  * Plan Output: `Index Scan using idx_nc_timestamp_comp on network_connections nc`.
+  * Plan Output: `Index Scan` processing nodes filtering via the composite predicate.
+  * Execution Time: 16.293 ms
 [[Image(ss1_after.png)]]
 
 * '''Index Usage Verification:''' Yes, the PostgreSQL engine bypassed raw relational sequential evaluation and bound query execution directly via index nodes inside the initial windowed CTE materialization.
-* '''Conclusion:''' Performance gains exceeded '''93.3%''', drastically lowering volatile block read latency.
+* '''Conclusion:''' Performance gains lowered overall query evaluation overhead, drastically reducing execution processing latency.
 
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@@ -38 +40 @@
 * '''Before Index Creation:'''
   * Plan Output: `Seq Scan on security_alerts sa` (Forced sequential full table scan table reading).
+  * Execution Time: 5.521 ms
 [[Image(ss2_before.png)]]
 
 * '''After Index Creation (Optimized Time-Window Filter):'''
   * Plan Output: `Bitmap Index Scan using idx_sa_timestamp_comp on security_alerts sa`.
-  * ''Note: Initial disk I/O cold-reads are cached instantly upon sequential execution runs, dropping execution time to sub-millisecond levels.''
+  * Execution Time: 2.853 ms
 [[Image(ss2_after.png)]]
 
 * '''Index Usage Verification:''' Yes, explicitly verified. The database execution layer shifted from a row-by-row table check to a highly optimized `Bitmap Index Scan` execution block mapping.
-* '''Conclusion:''' Performance scaled by over '''91.8%''' for real-time operation filters, successfully validating index utilization under optimal predicate selectivity conditions.
+* '''Conclusion:''' Performance scaled by over '''48%''' for real-time operation filters, successfully validating index utilization under optimal predicate selectivity conditions.
 
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@@ -61 +64 @@
 * '''Before Index Creation:'''
   * Plan Output: `Seq Scan on computer_history ch` causing an expensive down-stream HashAggregate step across historical partitions.
+  * Execution Time: 6.559 ms
 [[Image(ss3_before.png)]]
 
 * '''After Index Creation:'''
-  * Plan Output: `Index Scan using idx_ch_timestamp_comp`.
+  * Plan Output: `Bitmap Index Scan using idx_ch_timestamp_comp on computer_history ch`.
+  * Execution Time: 1.626 ms
 [[Image(ss3_after.png)]]
 
 * '''Index Usage Verification:''' Yes, successfully achieved an Index path, eliminating the need to parse raw heap blocks.
-* '''Conclusion:''' Performance scaled up by over '''92%''', preventing telemetry logging pipelines from bottlenecking.
+* '''Conclusion:''' Performance scaled up by over '''75%''', preventing telemetry logging pipelines from bottlenecking.
 
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@@ -83 +88 @@
 * '''Before Index Creation:'''
   * Plan Output: Multi-pass sequential loops across table sub-trees to calculate environmental averages.
+  * Execution Time: 53.382 ms
 [[Image(ss6_before.png)]]
 
 * '''After Index Creation:'''
-  * Plan Output: `Index Scan using idx_se_timestamp_comp` implemented natively across both separate evaluation scopes of the CTE.
+  * Plan Output: Evaluated via discrete index conditions (`Index Searches: 2`) implemented natively across evaluation scopes of the CTE.
+  * Execution Time: 32.772 ms
 [[Image(ss6_after.png)]]
 
-* '''Index Usage Verification:''' Yes, the index successfully injected directly inside the localized cross-join nodes.
-* '''Conclusion:''' Execution times dropped by over '''89%''', allowing heavy statistical parsing to complete efficiently.
+* '''Index Usage Verification:''' Yes, the index successfully injected directly inside the localized lookup nodes.
+* '''Conclusion:''' Execution times dropped by over '''38%''', allowing heavy statistical parsing to complete efficiently.
 
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