H2 嵌入式数据库引擎
H2是一个短小精干的嵌入式数据库引擎，主要的特性包括：
几个嵌入式数据库的对比：
| H2 | Derby | HSQLDB | Mysql | PostgreSQL | |
|---|---|---|---|---|---|
| Pure Java | Yes | Yes | Yes | No | No |
| Memory Mode | Yes | No | Yes | No | No |
| Transaction Isolation | Yes | Yes | No | Yes | Yes |
| COSt Based Optimizer | Yes | Yes | No | Yes | Yes |
| Encrypted Database | Yes | Yes | No | No | No |
| ODBC Driver | Yes | No | No | Yes | Yes |
| Fulltext Search | Yes | No | No | Yes | Yes |
| Multi Version Concurrency | Yes | No | No | No | Yes |
| FoOTPrint (jar/dll size) | ~1 MB | ~2 MB | ~600 KB | ~4 MB | ~6 MB |
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