1. Health Monitor简介
Health Monitor是11g里新增加的特性，用于数据库的各层和各个组建的诊断检查。例如可以检查：文件损坏、物理逻辑块损坏、redo和undo故障、数据字典损坏等。HM可以根据检查的结果产生一个报表，并提供解决问题的建议。
1.1 运行方式：
1). Reactive
Fault diagnosability infrastructure能自动响应严重的错误（critical error）。
2). Manually
可以通过DBMS_HM系统包或 Enterprise Manager来手工运行HM。
1.2 运行模式
1). DB-ONLINE
2). DB-OFFLINE
所有HM都能在online模式下运行，只有Redo Integrity Check 和 DB Structure Integrity Check能在offline模式下运行。
2. HM的类型
见附件详细说明
也可以通过视图来查询：
SQL> SELECT name FROM v$hm_check WHERE internal_check='N';
NAME
----------------------------------------------------------------
DB Structure Integrity Check
Data Block Integrity Check
Redo Integrity Check
Transaction Integrity Check
Undo Segment Integrity Check
Dictionary Integrity Check
3. 手工运行HM
3.1 通过DBMS_HM系统包
例如：
BEGIN
DBMS_HM.RUN_CHECK('Dictionary Integrity Check', 'my_run');
END;
该程序允许有输入参数，可以通过如下方式查找：
SQL>SELECT c.name check_name, p.name parameter_name, p.type,p.default_value, p.description
FROM v$hm_check_param p, v$hm_check c
WHERE p.check_id = c.id and c.internal_check = 'N'
ORDER BY c.name;
带参数实例：
BEGIN
DBMS_HM.RUN_CHECK (
check_name => 'Transaction Integrity Check',
run_name => 'my_run',
input_params => 'TXN_ID=7.33.2');
END;
3.2 通过OEM允许
Advisor Central －》Checkers －》 Run
4. 查看HM报表
4.1 通过DBMS_HM系统包
实例：
SQL>SET LONG 100000
SQL>SET LONGCHUNKSIZE 1000
SQL>SET PAGESIZE 1000
SQL>SET LINESIZE 512
SQL>SELECT DBMS_HM.GET_RUN_REPORT('HM_RUN_1061') FROM DUAL;
DBMS_HM.GET_RUN_REPORT('HM_RUN_1061')
-----------------------------------------------------------------------
Run Name : HM_RUN_1061
Run Id : 1061
Check Name : Data Block Integrity Check
Mode : REACTIVE
Status : COMPLETED
Start Time : 2007-05-12 22:11:02.032292 -07:00
End Time : 2007-05-12 22:11:20.835135 -07:00
Error Encountered : 0
Source Incident Id : 7418
Number of Incidents Created : 0
Input Paramters for the Run
BLC_DF_NUM=1
BLC_BL_NUM=64349
Run Findings And Recommendations
Finding
Finding Name : Media Block Corruption
Finding ID : 1065
Type : FAILURE
Status : OPEN
Priority : HIGH
Message : Block 64349 in datafile 1:
'/ade/sfogel_emdb/oracle/dbs/t_db1.f' is media corrupt
Message : Object BMRTEST1 owned by SYS might be unavailable
Finding
Finding Name : Media Block Corruption
Finding ID : 1071
Type : FAILURE
Status : OPEN
Priority : HIGH
Message : Block 64351 in datafile 1:
'/ade/sfogel_emdb/oracle/dbs/t_db1.f' is media corrupt
Message : Object BMRTEST2 owned by SYS might be unavailable
4.2 通过ADRCI查看
adrci> show hm_run
ADR Home = /u01/app/oracle/diag/rdbms/orcl/orcl:
*************************************************************************
**********************************************************
HM RUN RECORD 1
**********************************************************
RUN_ID 1
RUN_NAME liang
CHECK_NAME Dictionary Integrity Check
NAME_ID 24
MODE 0
START_TIME 2009-07-13 17:31:46.436329 +08:00
RESUME_TIME <NULL>
END_TIME 2009-07-13 17:31:58.773625 +08:00
MODIFIED_TIME 2009-07-13 17:31:58.773625 +08:00
TIMEOUT 0
FLAGS 0
STATUS 5
SRC_INCIDENT_ID 0
NUM_INCIDENTS 0
ERR_NUMBER 0
REPORT_FILE <NULL>
1 rows fetched
adrci> create report hm_run liang
adrci> show report hm_run liang
<?xml version="1.0" encoding="US-ASCII"?>
<HM-REPORT REPORT_ID="liang">
<TITLE>HM Report: liang</TITLE>
<RUN_INFO>
<CHECK_NAME>Dictionary Integrity Check</CHECK_NAME>
<RUN_ID>1</RUN_ID>
<RUN_NAME>liang</RUN_NAME>
<RUN_MODE>MANUAL</RUN_MODE>
<RUN_STATUS>COMPLETED</RUN_STATUS>
<RUN_ERROR_NUM>0</RUN_ERROR_NUM>
<SOURCE_INCIDENT_ID>0</SOURCE_INCIDENT_ID>
<NUM_INCIDENTS_CREATED>0</NUM_INCIDENTS_CREATED>
<RUN_START_TIME>2009-07-13 17:31:46.436329 +08:00</RUN_START_TIME>
<RUN_END_TIME>2009-07-13 17:31:58.773625 +08:00</RUN_END_TIME>
</RUN_INFO>
<RUN_PARAMETERS>
<RUN_PARAMETER>TABLE_NAME=ALL_CORE_TABLES</RUN_PARAMETER>
<RUN_PARAMETER>CHECK_MASK=ALL</RUN_PARAMETER>
</RUN_PARAMETERS>
<RUN-FINDINGS/>
4.3 通过OEM
Advisor Central －》Checkers－》Runs －》View Report
5. HM视图
除了可以创建一个checker报表外，还可以在ADR里直接查看已经产生的报表。可查看的视图有：
V$HM_RUN,V$HM_FINDING, andV$HM_RECOMMENDATION.
例如：
SQL>
SELECT run_id, name, check_name, run_mode, src_incident FROM v$hm_run;
RUN_ID NAME CHECK_NAME RUN_MODE SRC_INCIDENT
---------- ------------ ---------------------------------- -------- ------------
1 HM_RUN_1 DB Structure Integrity Check REACTIVE 0
101 HM_RUN_101 Transaction Integrity Check REACTIVE 6073
121 TXNCHK Transaction Integrity Check MANUAL 0
181 HMR_tab$ Dictionary Integrity Check MANUAL 0
.
.
.
981 Proct_ts$ Dictionary Integrity Check MANUAL 0
1041 HM_RUN_1041 DB Structure Integrity Check REACTIVE 0
1061 HM_RUN_1061 Data Block Integrity Check REACTIVE 7418
SQL> SELECT type, description FROM v$hm_finding WHERE run_id = 1061;
TYPE DESCRIPTION
------------- -----------------------------------------
FAILURE Block 64349 in datafile 1: '/ade/sfogel_e
mdb/oracle/dbs/t_db1.f' is media corrupt
FAILURE Block 64351 in datafile 1: '/ade/sfogel_e
mdb/oracle/dbs/t_db1.f' is media corrupt
Types of Health Checks
Health Check Parameters Reference 01
Health Check Parameters Reference 02