1. ARCHIVE_LAG_TARGET forces a log switch after the specified amount of time elapses.有效值為0（disabled）或 [ 60,7200 ]
2. SEC_PROTOCOL_ERROR_FURTHER_ACTION specifies the further execution of a server process when receiving bad packets from a possibly malicious client.SEC_PROTOCOL_ERROR_FURTHER_ACTION = { CONTINUE | (DELAY,integer) | (DROP,integer) }
3. ASM_POWER_LIMIT specifies the maximum power on an Automatic Storage Management instance for disk rebalancing. The higher the limit, the faster rebalancing will complete. Lower values will take longer, but consume fewer processing and I/O resources.
4. DB_FILE_MULTIBLOCK_READ_COUNT DB_FILE_MULTIBLOCK_READ_COUNT is one of the parameters you can use to minimize I/O during table scans. It specifies the maximum number of blocks read in one I/O operation during a sequential scan. The total number of I/Os needed to perform a full table scan depends on such factors as the size of the table, the multiblock read count, and whether parallel execution is being utilized for the operation.
5. SGA_MAX_SIZE SGA_MAX_SIZE specifies the maximum size of the SGA for the lifetime of the instance.On 64-bit platforms and non-Windows 32-bit platforms, when either MEMORY_TARGET or MEMORY_MAX_TARGET is specified, the default value of SGA_MAX_SIZE is set to the larger of the two parameters. This causes more address space to be reserved for expansion of the SGA.
6. OPEN_CURSORS OPEN_CURSORS specifies the maximum number of open cursors (handles to private SQL areas) a session can have at once. You can use this parameter to prevent a session from opening an excessive number of cursors.
7. DB_FLASHBACK_RETENTION_TARGET DB_FLASHBACK_RETENTION_TARGET specifies the upper limit (in minutes) on how far back in time the database may be flashed back. How far back one can flashback a database depends on how much flashback data Oracle has kept in the fast recovery area.
8. LOCAL_LISTENER LOCAL_LISTENER specifies a network name that resolves to an address or address list of Oracle Net local listeners (that is, listeners that are running on the same machine as this instance). The address or address list is specified in the TNSNAMES.ORA file or other address repository as configured for your system.語法：LOCAL_LISTENER = network_name，預設值是(ADDRESS = (PROTOCOL=TCP)(HOST=hostname)(PORT=1521)) where hostname is the network name of the local host.
它填的是TNSNAMES.ORA中的網路字串，通過該網路字串來對映本地監聽器的地址，若TNSNAMES.ORA檔案中內容如下：
TEST3 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = node2.being.com)(PORT = 1523))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = sz.being.com)
)
) TEST2 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = node2.being.com)(PORT = 1522))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = sz.being.com)
)
) TEST1 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = node2.being.com)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = sz.being.com)
)
)
倘若兩個埠1522,1523對應的監聽器已啟動，若我將LOCAL_LISTENER設定為以下值：SQL> alter system set local_listener='TEST3';則我用TEST2登陸資料庫，會報以下錯誤：
[oracle@node2 admin]$ sqlplus scott/tiger@test2
ERROR:
ORA-12514: TNS:listener does not currently know of service requested in connect
descriptor Enter user-name:
但是用TEST3，即sqlplus scott/tiger@test3會成功登陸，反之亦然。
如果我想既能用TEST2登陸又能用TEST3登陸，則LOCAL_LISTENER必須設定為以下值：SQL> alter system set local_listener='TEST2','TEST3';
注意：1. 若LOCAL_LISTENER為空，則預設對映1521埠
2. 即便LOCAL_LISTENER設定為 local_listener='TEST2','TEST3'，TEST1仍能成功登陸，即1521埠是預設的。