New posts for Spring and Hibernate

2026-11-06 01:05:17 +05:30
parent b83cc9988e
commit 0245c00033
57 changed files with 2113 additions and 0 deletions
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+10,000 inserts: IDENTITY vs SEQUENCE vs UUID, hibernate.jdbc.batch_size=50, flush+clear every 50 rows
+
+######## H2 ########
+database: H2Dialect / H2 2.4.240 (2025-09-22)
+timings are wall-clock milliseconds on one developer machine, one run each after a warm-up pass: indicative, not a benchmark
+
+IDENTITY                          331 ms   prepared=10000 (insert=10000, sequence=0) addBatch=0 executeBatch=0 executeSingle=10000
+SEQUENCE allocationSize=1         226 ms   prepared=10200 (insert=200, sequence=10000) addBatch=10000 executeBatch=200 executeSingle=10000
+SEQUENCE allocationSize=50         46 ms   prepared=400 (insert=200, sequence=200) addBatch=10000 executeBatch=200 executeSingle=200
+UUID v4 (GenerationType.UUID)      98 ms   prepared=200 (insert=200, sequence=0) addBatch=10000 executeBatch=200 executeSingle=0
+UUID v7 (Style.VERSION_7)          64 ms   prepared=200 (insert=200, sequence=0) addBatch=10000 executeBatch=200 executeSingle=0
+
+Hibernate Statistics for the whole session factory (all rows above, including the warm-up): entityInsertCount=55000 prepareStatementCount=23101
+
+Same SEQUENCE allocationSize=50 entity, hibernate.jdbc.batch_size NOT set:
+SEQUENCE allocationSize=50         68 ms   prepared=10201 (insert=10000, sequence=201) addBatch=0 executeBatch=0 executeSingle=10201
+
+######## POSTGRES ########
+SKIPPED: no Docker daemon was reachable when this transcript was generated, so PostgreSQL was not run.