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Compacting the DHCP Database
Entries in the DHCP database are continually being added, modified, and deleted throughout the IP address leasing process. When entries are deleted, the space is not always completely filled with a new entry, due to the different sizes of each entry. After some time, the database contains unused space that can be recovered by compacting the database. This process is analogous to defragmenting a disk drive.
Microsoft recommends compacting the DHCP database from once every month to once every week, depending on the size of the internetwork. This compaction increases transaction speed and reduces the disk space used by the database.
The jetpack utility compacts the DHCP database (DHCP.mdb) into a temporary database, which is then automatically copied to DHCP.mdb and deleted. The command used is jetpack DHCP.mdb temp_name.mdb, where temp_name.mdb is any file name specified by the user, with extension .mdb.
The following shows how to compact the DHCP database:
| 1. | Stop the DHCP server service by using the Control Panel, Server Manager, or a command prompt. |
| 2. | To stop the service from a command prompt, type net stop dhcpserver service. This stops the DHCP server. |
| 3. | Type cd \systemroot\system32\dhcp, where systemroot is WINNT35. This changes to the DHCP directory. |
| 4. | Type jetpack dhcp.mdb temp.mdb. This compacts dhcp.mdb into temp.mdb, then copies it back to dhcp.mdb, and automatically deletes temp.mdb. |
| 5. | Type net start dhcpserver. This restarts the DHCP server service. |
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