birt code 39

birt code 39

birt code 39

birt code 39

birt code 39

birt code 39,

birt code 39,
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birt code 39,
birt code 39,
birt code 39,
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birt code 39,
birt code 39,
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birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,

birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
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birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
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birt code 39,
birt code 39,
birt code 39,
birt code 39,
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birt code 39,
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birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
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birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
birt code 39,
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23:

15

Since one of the purposes of using active/active failover is to have both appliances process traffic, you ll need to configure preemption to get around the issue shown in the secondary status from the previous show failover command This is done on the primary appliance:

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primary(config)# failover group 1 primary(config-fover-group)# primary primary(config-fover-group)# preempt primary(config-fover-group)# exit primary(config)# failover group 2 primary(config-fover-group)# secondary primary(config-fover-group)# preempt primary(config-fover-group)# exit

It can restart the transaction, but only if the transaction was aborted as a result of some hardware or software error that was not created through the internal logic of the transaction A restarted transaction is considered to be a new transaction It can kill the transaction It usually does so because of some internal logical error that can be corrected only by rewriting the application program, or because the input was bad, or because the desired data were not found in the database We must be cautious when dealing with observable external writes, such as writes to a terminal or printer Once such a write has occurred, it cannot be erased, since it may have been seen external to the database system Most systems allow such writes to take place only after the transaction has entered the committed state One way to implement such a scheme is for the database system to store any value associated with such external writes temporarily in nonvolatile storage, and to perform the actual writes only after the transaction enters the committed state If the system should fail after the transaction has entered the committed state, but before it could complete the external writes, the database system will carry out the external writes (using the data in nonvolatile storage) when the system is restarted Handling external writes can be more complicated in some situations For example suppose the external action is that of dispensing cash at an automated teller machine, and the system fails just before the cash is actually dispensed (we assume that cash can be dispensed atomically) It makes no sense to dispense cash when the system is restarted, since the user may have left the machine In such a case a compensating transaction, such as depositing the cash back in the users account, needs to be executed when the system is restarted.

Now when I examine the status of failover on either appliance, I should see that one is active for one context, and the other appliance is active for the second context:

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Target 100%

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primary(config)# show failover Failover On Cable status: N/A - LAN-based failover enabled Failover unit Primary Failover LAN Interface: lanfail Ethernet0/2 (up) Unit Poll frequency 500 milliseconds, holdtime 2 seconds Interface Poll frequency 5 seconds, holdtime 25 seconds Interface Policy 1 Monitored Interfaces 0 of 250 maximum Version: Ours 80(3), Mate 80(3) Group 1 last failover at: 01:15:13 UTC Jan 1 1993 Group 2 last failover at: 01:11:19 UTC Jan 1 1993 This host: Group 1 Group 2 Primary State: Active time: State: Active time: