zabbix 表结构详情（基本）
mysql> desc items ;+-----------------------+---------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------------+---------------------+------+-----+---------+-------+
| itemid | bigint(20) unsigned | NO | PRI | 0 | |
| type | int(11) | NO | | 0 | |
| snmp_community | varchar(64) | NO | | | |
| snmp_oid | varchar(255) | NO | | | |
| snmp_port | int(11) | NO | | 161 | |
| hostid | bigint(20) unsigned | NO | MUL | 0 | |
| description | varchar(255) | NO | | | |
| key_ | varchar(255) | NO | | | |
| delay | int(11) | NO | | 0 | |
| history | int(11) | NO | | 90 | |
| trends | int(11) | NO | | 365 | |
| lastvalue | varchar(255) | YES| | NULL | |
| lastclock | int(11) | YES| | NULL | |
| prevvalue | varchar(255) | YES| | NULL | |
| status | int(11) | NO | MUL | 0 | |
| value_type | int(11) | NO | | 0 | |
| trapper_hosts | varchar(255) | NO | | | |
| units | varchar(10) | NO | | | |
| multiplier | int(11) | NO | | 0 | |
| delta | int(11) | NO | | 0 | |
| prevorgvalue | varchar(255) | YES| | NULL | |
| snmpv3_securityname | varchar(64) | NO | | | |
| snmpv3_securitylevel| int(11) | NO | | 0 | |
| snmpv3_authpassphrase | varchar(64) | NO | | | |
| snmpv3_privpassphrase | varchar(64) | NO | | | |
| formula | varchar(255) | NO | | 1 | |
| error | varchar(128) | NO | | | |
| lastlogsize | int(11) | NO | | 0 | |
| logtimefmt | varchar(64) | NO | | | |
| templateid | bigint(20) unsigned | NO | MUL | 0 | |
| valuemapid | bigint(20) unsigned | NO | | 0 | |
| delay_flex | varchar(255) | NO | | | |
| params | text | NO | | NULL | |
| ipmi_sensor | varchar(128) | NO | | | |
| data_type | int(11) | NO | | 0 | |
| authtype | int(11) | NO | | 0 | |
| username | varchar(64) | NO | | | |
| password | varchar(64) | NO | | | |
| publickey | varchar(64) | NO | | | |
| privatekey | varchar(64) | NO | | | |
| mtime | int(11) | NO | | 0 | |
+-----------------------+---------------------+------+-----+---------+-------+
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