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@@ -28,53 +28,63 @@
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#
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# source dhcpdb_create.mysql
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+
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# Holds the IPv4 leases.
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CREATE TABLE lease4 (
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- address INT UNSIGNED UNIQUE NOT NULL, # IPv4 address
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- hwaddr VARBINARY(20), # Hardware address
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- client_id VARBINARY(128), # Client ID
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- lease_time INT UNSIGNED, # Length of the lease (seconds)
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- expire TIMESTAMP, # Expiration time of the lease
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- subnet_id INT UNSIGNED # Subnet identification
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+ address INT UNSIGNED PRIMARY KEY NOT NULL, # IPv4 address
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+ hwaddr VARBINARY(20), # Hardware address
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+ client_id VARBINARY(128), # Client ID
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+ lease_time INT UNSIGNED, # Length of the lease (seconds)
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+ expire TIMESTAMP, # Expiration time of the lease
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+ subnet_id INT UNSIGNED # Subnet identification
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) ENGINE = INNODB;
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-# Holds the IPv6 leases
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+# Holds the IPv6 leases.
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+# N.B. The use of a VARCHAR for the address is temporary for development:
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+# it will eventually be replaced by BINARY(16).
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CREATE TABLE lease6 (
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- address VARCHAR(40) UNIQUE NOT NULL, # IPv6 address (actually 39 is max)
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- hwaddr VARBINARY(20), # Hardware address
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- client_id VARBINARY(128), # Client ID
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- lease_time INT UNSIGNED, # Length of the lease (seconds)
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- expire TIMESTAMP, # Expiration time of the lease
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- subnet_id INT UNSIGNED, # Subnet identification
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- pref_lifetime INT UNSIGNED, # Preferred lifetime
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- lease_type TINYINT, # Lease type
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- iaid INT UNSIGNED, # IA ID
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- prefix_len TINYINT UNSIGNED # For IA_PD only
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+ address VARCHAR(40) PRIMARY KEY NOT NULL, # IPv6 address
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+ hwaddr VARBINARY(20), # Hardware address
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+ client_id VARBINARY(128), # Client ID
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+ lease_time INT UNSIGNED, # Length of the lease (seconds)
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+ expire TIMESTAMP, # Expiration time of the lease
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+ subnet_id INT UNSIGNED, # Subnet identification
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+ pref_lifetime INT UNSIGNED, # Preferred lifetime
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+ lease_type TINYINT, # Lease type (see lease6_types
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+ # table for possible values)
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+ iaid INT UNSIGNED, # See Section 10 of RFC 3315
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+ prefix_len TINYINT UNSIGNED # For IA_PD only
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) ENGINE = INNODB;
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# ... and a definition of lease6 types. This table is a convenience for
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# users of the database - if they want to view the lease table and use the
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# type names, they can join this table with the lease6 table
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CREATE TABLE lease6_types (
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- lease_type TINYINT UNIQUE NOT NULL, # Lease type code
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- name VARCHAR(5) # Name of the lease type
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+ lease_type TINYINT PRIMARY KEY NOT NULL, # Lease type code.
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+ name VARCHAR(5) # Name of the lease type
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);
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+START TRANSACTION;
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INSERT INTO lease6_types VALUES (0, "IA_NA"); # Non-temporary v6 addresses
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INSERT INTO lease6_types VALUES (1, "IA_TA"); # Temporary v6 addresses
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INSERT INTO lease6_types VALUES (2, "IA_PD"); # Prefix delegations
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+COMMIT;
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# Finally, the version of the schema. We start at 0.1 during development.
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# This table is only modified during schema upgrades. For historical reasons
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# (related to the names of the columns in the BIND 10 DNS database file), the
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# first column is called "version" and not "major".
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CREATE TABLE schema_version (
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- version INT NOT NULL, # Major version number
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- minor INT NOT NULL # Minor version number
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+ version INT PRIMARY KEY NOT NULL, # Major version number
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+ minor INT # Minor version number
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);
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+START TRANSACTION;
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INSERT INTO schema_version VALUES (0, 1);
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-
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COMMIT;
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+# Notes:
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+#
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+# Indexes
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+# =======
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# It is likely that additional indexes will be needed. However, the
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# increase in lookup performance from these will come at the expense
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# of a decrease in performance during insert operations due to the need
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@@ -90,3 +100,17 @@ COMMIT;
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# For lease stability: if a client requests a new lease, try to find an
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# existing or recently expired lease for it so that it can keep using the
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# same IP address.
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+#
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+# Field Sizes
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+# ===========
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+# If any of the VARxxx field sizes are altered, the lengths in the MySQL
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+# backend source file (mysql_lease_mgr.cc) must be correspondingly changed.
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+#
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+# Portability
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+# ===========
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+# The "ENGINE = INNODB" on some tables is not portablea to another database
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+# and will need to be removed.
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+#
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+# Some columns contain binary data so are stored as VARBINARY instead of
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+# VARCHAR. This may be non-portable between databases: in this case, the
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+# definition should be changed to VARCHAR.
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Stephen Morris