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oraInventory 存放的是 Oracle 軟件安裝的目錄信息，Oralce 的安裝升級都需要用到這個目錄，來看看 Oracle 文檔中對這個目錄的一點說明：
All Oracle software installations rely on this directory. 
Ensure that you back it up regularly. 
Do not delete this directory unless you have completely removed 
all Oracle software from the system.

oraInventory 目錄的位置是由 oraInst.loc 文件決定的：
/etc/oraInst.loc (AIX and Linux Platform)
/var/opt/oracle/OraInst.loc (Solaris and HP-UX platform)

$cat /etc/oraInst.loc 
inventory_loc=/app/oracle/oraInventory
inst_group=dba
刪除或丟失 oraInventory 目錄的內容，都有可能導致升級報錯，例如在運行 opatch 時就有可能遇到以下報錯：
10G 中：
$opatch lsinventory
Invoking OPatch 10.2.0.4.3

OPatch failed to locate Central Inventory.
Possible causes are: 
    The Central Inventory is corrupted
    The oraInst.loc file specified is not valid.
LsInventorySession failed: OPatch failed to locate Central Inventory.
Possible causes are: 
    The Central Inventory is corrupted
    The oraInst.loc file specified is not valid.

OPatch failed with error code 73
$opatch lsinventory
Invoking OPatch 10.2.0.4.3

List of Homes on this system:

Inventory load failed… OPatch cannot load inventory for the given Oracle Home.
Possible causes are:
   Oracle Home dir. path does not exist in Central Inventory
   Oracle Home is a symbolic link
   Oracle Home inventory is corrupted
LsInventorySession failed: OracleHomeInventory gets null oracleHomeInfo

OPatch failed with error code 73
9I 中報錯：
OPATCH_JAVA_ERROR : An exception of type OPatchException has occurred: 
OPatch Exception:
 Can not lock OUI inventory (READ/WRITE Level)
 An exception occurs
 The inventory pointed at location /app/oraInventory is not valid

There is no Interim Patch

Can not get a list of inventory on this home.
LsInventory: OPatch Exception while accessing O2O

OPATCH_JAVA_ERROR : An exception of type OPatchException has occurred: 
OPatch Exception:
 OUI found no such ORACLE_HOME set in the environment
 Can not get details for given Oracle Home
 An exception occurs
 null

There is no Interim Patch

Can not get a list of inventory on this home.

ERROR: OPatch failed because of Inventory problem.
在 10G 中可以運行以下命令進行 oraInventory 目錄重建：
$cd $ORACLE_HOME/oui/bin
$./runInstaller -silent -attachHome \
ORACLE_HOME=$ORACLE_HOME \
ORACLE_HOME_NAME= ORACLE_HOME
Starting Oracle Universal Installer…

No pre-requisite checks found in oraparam.ini, 
no system pre-requisite checks will be executed.
The inventory pointer is located at /etc/oraInst.loc
The inventory is located at /app/oracle/oraInventory
AttachHome was successful.
js_znjh_1./app/oracle/product/10.2.0/db_1/oui/bin$
10.2.0.2 以上的版本，還可以直接運行 attachHome.sh 腳本：
$cd $ORACLE_HOME/oui/bin   
$./attachHome.sh
Starting Oracle Universal Installer…

No pre-requisite checks found in oraparam.ini, 
no system pre-requisite checks will be executed.
The inventory pointer is located at /etc/oraInst.loc
The inventory is located at /app/oracle/oraInventory
AttachHome was successful.

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