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ISC SysAdmin > System Continuity > Flashcards

System Continuity Flashcards

1
Q

You are configuring the journal settings in an instance of InterSystems IRIS. You know the following information:
• there are 5 days between snapshot backups, and
• it takes 1-3 days to verify backups, including an integrity check.
How many days of journal files need to be retained to recover from a detected database degrade?

a. 1
b. 3
c. 5
d. 6
e. 9
f. 13

A

e. 9

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2
Q

8) You are asked to set-up a mirror that provides high availability through automatic failover in case of a power outage.
Which TWO of the following features are NOT required by InterSystems when setting up the described mirror?

a. Mirror service enabled
b. Two failover members
c. TLS configured
d. An arbiter
e. Virtual IP
f. ISCAgent

A

c. TLS configured

e. Virtual IP

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3
Q

You are planning on producing a zero-downtime external backup of a journaled database using an external snapshot utility.
Which of the following actions should be performed immediately before you take the snapshot?

a. Switch the journal file
b. Dismount the database
c. Freeze writes to the database
d. Disable journaling for the database
e. Perform a database integrity check on the database

A

c. Freeze writes to the database

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4
Q

Which command can be used to temporarily stop any processing on IRIS ?

a. STOP IRIS
b. set status = ##class(General.Backup).ExternalFreeze()
c. set status = ##class(Backup.General).ExternalFreeze()
d. zStopIRIS

A

c. set status = ##class(Backup.General).ExternalFreeze()

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5
Q

Which of the following routines allows you to monitor mirrors ?

a. ^MIRROR
b. ^MONITOR
c. ^MONITORMIRROR
d. ^SYSMONITOR

A

a. ^MIRROR

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6
Q

When planning a mirror, failover members MUST what ?

a. Use TLS
b. Have the same DNS Name as the Primary
c. Be on the same subnet as the VIP
d. Be on the same Port as the VIP

A

c. Be on the same subnet as the VIP

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7
Q

If an instance has journal encryption enabled and you make it the primary failover member of a mirror, what must you also do ?

a. Configure the mirror to use TLS
b. Decrypt the data to the failover members
c. Enable the TLS Monitor
d. Register the VIP with the TLS Monitor

A

a. Configure the mirror to use TLS

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8
Q

The backup InterSystems IRIS instance can automatically take over from the primary, only if it can ensure that which two conditions are met ?

a. The backup instance has received the latest journal data from the primary.
b. The arbiter is up and available.
c. The ISCAgent is on the same subnet as the Primary.
d. The primary instance is no longer operating as primary and cannot do so without manual intervention.

A

a. The backup instance has received the latest journal data from the primary.
d. The primary instance is no longer operating as primary and cannot do so without manual intervention.

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9
Q

What happens to the Mirror if the Arbiter shuts down or hangs ?

a. The Mirror starts an automatic restore.
b. The Primary fails over to the Backup.
c. The Mirror hangs.
d. It has no direct effect.

A

d. It has no direct effect.

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10
Q

By default, which database does not have journaling enabled ?

a. IRISTEMP
b. IRISSYS
c. IRISAUDIT
d. USER

A

a. IRISTEMP

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11
Q

Which are the 2 correct steps taken during a 2-phase write operation ?

a. IRIS freezes the current Database.
b. IRIS writes updates to the Journal file.
c. IRIS writes the updated blocks to the WIJ.
d. IRIS reads the updates from the Journal file.
e. IRIS writes the blocks in the WIJ to the database on disk.

A

c. IRIS writes the updated blocks to the WIJ.

e. IRIS writes the blocks in the WIJ to the database on disk.

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12
Q

What is the default setting for the WIJ file size ?

a. 0
b. 1MB
c. 10MB
d. 1GB
e. 5GB

A

a. 0

The default of zero allows the WIJ to grow as needed but does not reserve space for this; entering a non-zero value reserves the specified space on the storage device.

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13
Q

Which program can restore all datasets in an IRIS instance ?

a. wijresto
b. iriswijdm
c. iriswdimj
d. iriswijresto

A

c. iriswdimj

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14
Q

After a system crash, for how long will the WIJ blocks typically be checked against the corresponding database blocks, until the system startup continues normally ?

a. 5 secs
b. 10 secs
c. 30 secs
d. 60 secs

A

b. 10 secs

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15
Q

After a system crash, if WIJ blocks are compared to database blocks and do not match, which file are they written to ?

a. MISMATCH.WIJ
b. COMPARE.WIJ
c. WIJMATCH.DAT
d. MISMATCH.DAT

A

a. MISMATCH.WIJ

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16
Q

What are the default and maximum values for journal size, when configuring Journalling ?

a. 1024 MB and 2048 MB
b. 1024 MB and 4096 MB
c. 1024 MB and 8192 MB
d. 1 MB and 10 MB

A

b. 1024 MB and 4096 MB

17
Q

When both compression and encryption are enabled, in which order do they work ?

a. It doesn’t matter
b. Encrypted, then compressed.
c. Encrypted & compressed in parallel.
d. Compressed, then encrypted.

A

d. Compressed, then encrypted.

18
Q

Which configuration setting affects the amount of memory allocated to journal buffers ?

a. buffjrn
b. jrnmem
c. jrnbufs
d. membufs

A

c. jrnbufs

19
Q

What are the default and maxiumum values for jrnbufs (amount of memory allocated for journal buffers) ?

a. 10 MB and 1024 MB
b. 64 MB and 1024 MB
c. 1024 MB and 4096 MB
d. 1 MB and 10 MB

A

b. 64 MB and 1024 MB

20
Q

What is the default name of the WIJ file ?

a. FILE.WIJ
b. WIJ.IRIS
c. DEFAULT.WIJ
d. IRIS.WIJ

A

d. IRIS.WIJ

21
Q

By default, in which directory is the WIJ file ?

a. install-dir/mgr
b. install-mgr/wij
c. install-dir/log
d. install-mgr/dir

A

a. install-dir/mgr

22
Q

What is the maximum length of the file directory name for the WIJ file ?

a. 43
b. 53
c. 63
d. 73

A

c. 63

23
Q

During Dataset Recovery, on Windows, how does the iriswdimj utility run ?

a. Interactively
b. Non-interactively
c. Deferred
d. Pre-emptively

A

b. Non-interactively

24
Q

Which utility allows you to rename the MISMATCH.WIJ file ?

a. ^%ZSTART
b. STURECOV
c. STURECO
d. RECOV

A

b. STURECOV

ISC SysAdmin (10 decks)

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