All rights reserved by Burleson. Why does Oracle make a distinction between alter system and alter database? Answer: The alter database and alter system commands are very similar but ehere are some subtle diffferences between when you use alter system and alter database: - Use the "alter database" statement to modify, maintain, or recover an existing database.
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Join Date Mar Posts 1. The settings stay in effect as long as the database is mounted. There are three kinds of lies: Lies, damned lies, and benchmarks Unix is user friendly.
It's just very particular about who it's friends are. Oracle DBA. The default database even creates SPFILE 2 Mounting the database have nothing to deal with the alter system command and the parameter changing. The changes are in effect until you do not restart the instance if they are done ONLY in memory.
For all instances with the database open, this clause has the following effect:. If a query is carried out by multiple successive OCI fetches, then Oracle Database does not wait for all fetches to finish. It waits for the current fetch to finish and then blocks the next fetch. If an instance is running in non-shared-server mode, then Oracle Database does not impose any restrictions on user logins in that instance. The surrounding single quotation marks are required. Oracle ASM first verifies that the current release is compatible for migration to the specified release, and then goes into limited functionality mode.
Oracle ASM then determines whether any rebalance operations are under way anywhere in the cluster. If there are any such operations, then the statement fails and must be reissued after the rebalance operations are complete. Rolling upgrade mode is a cluster-wide in-memory persistent state. The cluster continues to be in this state until there is at least one Oracle ASM instance running in the cluster. Any new instance joining the cluster switches to migration mode immediately upon startup. If all the instances in the cluster terminate, then subsequent startup of any Oracle ASM instance will not be in rolling upgrade mode until you reissue this statement to restart rolling upgrade of the Oracle ASM instances.
Specify this clause only after all instances in the cluster have migrated to the same software version. The statement will fail if the cluster is not in rolling upgrade mode. When you specify this clause, the Oracle ASM instance validates that all the members of the cluster are at the same software version, takes the instance out of rolling upgrade mode, and returns to full functionality of the Oracle ASM cluster.
Oracle ASM first verifies that all live nodes in the cluster are at the same version, and then goes into rolling patch mode, which is a cluster-wide in-memory persistent state. The cluster continues to be in this state until all live nodes have been patched to the latest patch level. Any nodes that are down during this operation are not patched. This does not affect the success of the rolling patch operation. However, you must patch these nodes before they are started.
Otherwise, they will not be allowed to join the cluster. Specify this clause only after all live nodes in the cluster have been patched to the latest patch level. The statement will fail if the cluster is not in rolling patch mode.
When you specify this clause, the Oracle ASM instance validates that all members of the cluster are at the same patch level, takes the instance out of rolling patch mode, and returns full functionality of the Oracle ASM cluster.
If any members of the cluster are not at the latest patch level, then this operation fails and the cluster goes into limited functionality mode. The following queries display information about rolling patches. Refer to Oracle Database Reference for more information. They also allow you to enable or disable access to the encrypted data in the instance. Existing sessions are not terminated.
This clause applies only to the current instance. However, you cannot roll back such a statement. OPEN When you specify this clause, the database uses the specified password to open the wallet and load the TDE master key into database memory for the duration of the instance, or establish a connection to the HSM in order to send the encrypted table and tablespace keys to the HSM and receive then back decrypted.
If the wallet is not available or is already open, then the database returns an error. A password is not required to close an auto-open wallet when only an auto-open wallet is present. The password is required to close an auto-open wallet when both an auto-open wallet and an encryption wallet are open.
Use this clause to generate a new TDE master encryption key, if none exists. If there are existing master keys in the HSM or keystore, then this clause rekeys the existing table and tablespace keys, that is, it decrypts all table and tablespace keys with the old master key and reencrypts them with the new master key. Specify the integer that identifies the certificate. The master encryption key is used to encrypt or decrypt table keys inside the HSM.
This decrypts the existing table and tablespace keys, and then reencrypts them with the newly created, HSM-based, master encryption key. Note that the wallet is still in use after you migrate to an HSM, because it may contain master encryption keys that were used for export files, RMAN backups, or encrypted data in temporary or undo tablespaces or redo log files. After migrating, perform one of the following steps:.
Do not delete the encryption wallet and do not forget the wallet password. After all sessions are cleaned up, the dispatcher process shuts down. If you do not specify IMMEDIATE , then the dispatcher stops accepting new connections immediately but waits for all its users to disconnect and for all its database links to terminate.
Then it shuts down.
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