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Note that a transaction attempting to upgrade a lock on an item Q may be forced to wait This enforced wait occurs if Q is currently locked by another transaction in shared mode Just like the basic two-phase locking protocol, two-phase locking with lock conversion generates only con ict-serializable schedules, and transactions can be serialized by their lock points Further, if exclusive locks are held until the end of the transaction, the schedules are cascadeless For a set of transactions, there may be con ict-serializable schedules that cannot be obtained through the two-phase locking protocol However, to obtain con ictserializable schedules through non-two-phase locking protocols, we need either to have additional information about the transactions or to impose some structure or ordering on the set of data items in the database In the absence of such information, two-phase locking is necessary for con ict serializability if Ti is a non-two-phase transaction, it is always possible to nd another transaction Tj that is two-phase so that there is a schedule possible for Ti and Tj that is not con ict serializable Strict two-phase locking and rigorous two-phase locking (with lock conversions) are used extensively in commercial database systems A simple but widely used scheme automatically generates the appropriate lock and unlock instructions for a transaction, on the basis of read and write requests from the transaction: When a transaction Ti issues a read(Q) operation, the system issues a lockS(Q) instruction followed by the read(Q) instruction When Ti issues a write(Q) operation, the system checks to see whether Ti already holds a shared lock on Q If it does, then the system issues an upgrade(Q) instruction, followed by the write(Q) instruction Otherwise, the system issues a lock-X(Q) instruction, followed by the write(Q) instruction All locks obtained by a transaction are unlocked after that transaction commits or aborts.

25:

A lock manager can be implemented as a process that receives messages from transactions and sends messages in reply The lock-manager process replies to lock-request messages with lock-grant messages, or with messages requesting rollback of the transaction (in case of deadlocks) Unlock messages require only an acknowledgment in response, but may result in a grant message to another waiting transaction The lock manager uses this data structure: For each data item that is currently locked, it maintains a linked list of records, one for each request, in the order in which the requests arrived It uses a hash table, indexed on the name of a data item, to nd the linked list (if any) for a data item; this table is called the lock table Each record of the linked list for a data item notes which transaction made the request, and what lock mode it requested The record also notes if the request has currently been granted

Inline mode Traffic in a class map that is associated with an inline mode policy is redirected into the AIP-SSM card to be processed for attacks If an attack is detected, one of the policies you can configure for the card is to drop the offending traffic Assuming the traffic passes the policies of the card, it is redirected back to the backplane of the appliance Promiscuous mode Traffic in a class map that is associated with a promiscuous policy is copied to the card for further processing, while the original traffic remains on the backplane of the appliance

The McGraw Hill Companies, 2001

Inline mode provides the advantage where atomic-based (attacks contained in a single packet), Trojan horse, and worm attacks can be easily thwarted, since the AIPSSM card can drop offending packets However, the downside of inline mode is that it introduces delay in a packet stream, possibly affecting delay-sensitive traffic Likewise, if the card becomes overwhelmed with too many packets, some packets are dropped The advantages and disadvantages of using inline mode, however, are the reverse for promiscuous mode In promiscuous mode, if an attack is detected, the AIP-SSM card can react to the attack by optionally logging into the ASA itself and setting up a shun function (see 24) to block the attacker One advantage of the ASA is that you can define policies where some traffic uses inline mode with the AIP-SSM card, and other traffic uses promiscuous mode

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Contract Value $2M $5M Presales Support Specialist Contracts Specialist Service Coordinator Installation Specialist $100 $75 $75 $50 $5M 15M $150 $125 $125 $75 >$15M $250 $175 $175 $100

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