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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(diǎn)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(nèi)容，都有可能導(dǎo)致升級報(bào)錯，例如在運(yùn)行opatch時就有可能遇到以下報(bào)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(bào)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(yùn)行以下命令進(jìn)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(yùn)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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本文標(biāo)題：Oracle中Inventory目錄的作用是什么
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