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| <h1 class="title">TDB Requirements</h1> |
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| <p>TDB can run on 32 bit or 64 bit JVMs. It adapts to the underlying |
| architecture by choosing different file access mechanisms. 64 bit |
| Java is preferred for large scale and production deployments. On 64 |
| bit Java, TDB uses memory mapped files.</p> |
| <p>On 32 bit platforms, TDB uses in-heap caching of file data. In |
| practice, the JVM heap size should be set to at least 1Gbyte. While |
| there is no inherent scaling limits on the size of the database |
| but, in practice, only one large dataset can be handled per TDB |
| instance.</p> |
| <p>The on-disk file format is compatible between 32 and 64 bit systems |
| and databases can be transferred between systems by file copy if |
| the databases are not in use (no TDB instance is accessing them at |
| the time). Databases can not be copied while TDB is running, even |
| if TDB is not actively processing a query or update.</p> |
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