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The multiversion two-phase locking protocol attempts to combine the advantages of multiversion concurrency control with the advantages of two-phase locking This protocol differentiates between read-only transactions and update transactions Update transactions perform rigorous two-phase locking; that is, they hold all locks up to the end of the transaction Thus, they can be serialized according to their commit order Each version of a data item has a single timestamp The timestamp in this case is not a real clock-based timestamp, but rather is a counter, which we will call the ts-counter, that is incremented during commit processing Read-only transactions are assigned a timestamp by reading the current value of ts-counter before they start execution; they follow the multiversion timestampordering protocol for performing reads Thus, when a read-only transaction Ti issues a read(Q), the value returned is the contents of the version whose timestamp is the largest timestamp less than TS(Ti ) When an update transaction reads an item, it gets a shared lock on the item, and reads the latest version of that item When an update transaction wants to write an item, it rst gets an exclusive lock on the item, and then creates a new version of the data item The write is performed on the new version, and the timestamp of the new version is initially set to a value , a value greater than that of any possible timestamp When the update transaction Ti completes its actions, it carries out commit processing: First, Ti sets the timestamp on every version it has created to 1 more than the value of ts-counter; then, Ti increments ts-counter by 1 Only one update transaction is allowed to perform commit processing at a time As a result, read-only transactions that start after Ti increments ts-counter will see the values updated by Ti , whereas those that start before Ti increments ts-counter will see the value before the updates by Ti In either case, read-only transactions never need to wait for locks Multiversion two-phase locking also ensures that schedules are recoverable and cascadeless Versions are deleted in a manner like that of multiversion timestamp ordering Suppose there are two versions, Qk and Qj , of a data item, and that both versions have a timestamp less than the timestamp of the oldest read-only transaction in the system Then, the older of the two versions Qk and Qj will not be used again and can be deleted.

ASA 5520 G0/1

The McGraw Hill Companies, 2001

Here is the formula expressed as numbers: $100,000 $2,000,000 100 5%

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A system is in a deadlock state if there exists a set of transactions such that every transaction in the set is waiting for another transaction in the set More precisely, there exists a set of waiting transactions {T0 , T1 , , Tn } such that T0 is waiting for a data item that T1 holds, and T1 is waiting for a data item that T2 holds, and , and Tn 1 is waiting for a data item that Tn holds, and Tn is waiting for a data item that T0 holds None of the transactions can make progress in such a situation The only remedy to this undesirable situation is for the system to invoke some drastic action, such as rolling back some of the transactions involved in the deadlock Rollback of a transaction may be partial: That is, a transaction may be rolled back to the point where it obtained a lock whose release resolves the deadlock There are two principal methods for dealing with the deadlock problem We can use a deadlock prevention protocol to ensure that the system will never enter a deadlock state Alternatively, we can allow the system to enter a deadlock state, and then try to recover by using a deadlock detection and deadlock recovery scheme As we shall see, both methods may result in transaction rollback Prevention is commonly used if the probability that the system would enter a deadlock state is relatively high; otherwise, detection and recovery are more ef cient Note that a detection and recovery scheme requires overhead that includes not only the run-time cost of maintaining the necessary information and of executing the detection algorithm, but also the potential losses inherent in recovery from a deadlock

To set up and verify the operation of the CSC-SSM card, you must use ASDM Unlike the AIP-SSM card, which can be accessed via the backplane of the ASA or through the external Ethernet interface on the card, the CSC-SSM card lacks any physical interfaces: almost all access to it must be made via the backplane of the ASA using ASDM However, you can place a basic configuration on it using a CLI so that the rest of the configuration can be accomplished using ASDM (this is somewhat similar to the AIP-SSM card) Basically the following information needs to be configured either via the CLI or ASDM before the card can be used: a subscription activation key; a management IP address, subnet mask, and default gateway address; a DNS server address; a host and domain name; an e-mail and SMTP server address for e-mail notifications; addresses allowed to manage the card; and a new management password Here s an example of accessing the CLI of the card and placing a basic configuration on it:

The McGraw Hill Companies, 2001

derived attribute total participation of entity set in relationship discriminating attribute of weak entity set many-to-one relationship

hostname# session 1 Opening command session with slot 1 Connected to slot 1 Escape character sequence is 'CTRL-^X' login: cisco Password: cisco You are required to change your password immediately (password aged) Changing password for cisco (current) UNIX password: cisco New password: <new password> Retype new password: <new password> Trend Micro InterScan for Cisco CSC SSM Setup Wizard ---------------------------------------------------------------To set up the SSM, the wizard prompts for the following information: 1 Network settings 2 Date/time settings verification 3 Incoming email domain name 4 Web console administrator password 5 Notification settings 6 Activation Codes The Base License is required to activate the SSM Press Control-C to abort the wizard Press Enter to continue <ENTER> Network Settings ----------------------------------------------------------------Enter the SSM card IP address: 192168120