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1Z0-027 日本語学習内容 & 1z1-809日本語 資格問題対応 - 1z1-061 復習テキスト

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1Z0-027試験番号:1Z0-027

試験科目:「Oracle Exadata X3 and X4 Administration」

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最近更新時間:2017-03-13

問題と解答:全72問 1Z0-027 日本語学習内容

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1z1-809日本語試験番号:1z1-809日本語

試験科目:「Java SE 8 Programmer II (1z1-809日本語版)」

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1z1-061試験番号:1z1-061

試験科目:「Oracle Database 12c: SQL Fundamentals」

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NO.1 Your customer wants you to partition the database and storage grids in his X3-2 fiull rack,
creating database clusters and two storage grids.
One cluster will be used fior production and should consist ofi 6 databases servers and 11 cells firom
the first storage grid.
The other cluster will be used fior test and development, and should consist ofi 2 database servers
and 3 cells firom the second storage grid.
The storage must be partitioned so that the cells are visible only to the appropriate database servers
based on the description above.
What must be done to achieve this?
A. Edit the CELLIP.ORA file on each database server to contain IP addresses ofi cells in the storage grid
associated with cluster to which that database server belongs.
B. Configure Exadata realms using Oracle ASM scoped security mode.
C. Edit the CELLIP.ORA file on each cell to contain IP addresses ofi database servers in the database
server grid that are associated with the storage grid to which that cell belongs.
D. Configure Exadata realms using Database scoped security mode.
E. Edit the CELLIP.ORA file on each database server to contain IP addresses ofi database servers which
are allowed access to specific cells in the same storage grid.
F. Edit the CELLINIT.ORA file on each database server to contain IP addresses ofi cells in the storage
grid associated with the cluster to which that database server belongs.
Answer: A

1Z0-027 種類   1Z0-027 スキル   
Explanation:
cellip.ora
The cellip.ora is the configuration file, on every compute node, that tells ASM instances which cells
are available to
this cluster.
Here is a content ofi a typical cellip.ora file fior a quarter rack system:
$ cat /etc/oracle/cell/network-config/cellip.ora
cell="192.168.10.3"
cell="192.168.10.4"
cell="192.168.10.5"
Now that we see what is in the cellip.ora, the grid disk path, in the examples above, should make
more sense.
Note:
* cellinit.ora decides which network takes storage traffic.
* cellip.ora - list ofi cells, new cells can be added dynamically without shutdown

NO.2 Which two are true about Smart Scan?
A. A query rewrite may occur to a container table stored Exadata, and it will always benefit firom
Smart Scan.
B. All joins can be offloaded to the storage servers.
C. Column projection does not contribute to the perfiormance benefit ofi Smart Scan
D. It is possible to offload single row fiunctions to the storage servers.
E. a query rewrite may occur to a container table stored in Exadata but will never benefit From Smart
scan.
F. Some joins can be offloaded to the storage servers.
Answer: D,F

1Z0-027 日記   
Explanation:
C: With Exadata storage, database operations are handled much more efficiently. Queries that
perfiorm table scans
can be processed within Exadata storage with only the required subset ofi data returned to the
database server. Row
filtering, column filtering and some join processing (among other fiunctions) are perfiormed within
the Exadata storage
cells. When this takes place only the relevant and required data is returned to the database server.
D (not F):
* Exadata perfiorms joins between large tables and small lookup tables, a very common scenario fior
data warehouses
with star schemas. Joining large tables and small lookup tables is implemented using Bloom Filters,
which are a very
efficient probabilistic method to determine whether a row is a member ofi the desired result set.
* Ifi storage indexes are so great, why doesn't Oracle Exadata use them all the time? The short
answer is that they are
created and used only when they will be beneficial.
* To use storage indexes, Oracle Exadata queries must use smart scans, so not all types ofi
applications can benefit
firom storage indexes. Applications with queries that include predicates and perfiorm a lot ofi fiull
table scans or fiast fiull
scans ofi indexes-typically those used in data warehousing environments-will benefit greatly firom
storage indexes.
Online transaction processing (OLTP) applications, on the other hand, typically access a small number
ofi rows through
standard indexes and do not perfiorm fiull table scans, so they may not benefit firom storage indexes
.
Note:
* Storage indexes reside in the memory ofi the storage servers-also called storage cells-and
significantly reduce
unnecessary I/O by excluding irrelevant database blocks in the storage cells.
* To use storage indexes, Oracle Exadata queries must use smart scans, so not all types ofi
applications can benefit
firom storage indexes.
Incorrect:
Not B: Exadata provides column filtering, also called column projection, fior table scans. Only the
columns requested
are returned to the database server rather than all columns in a table. For example, when the
fiollowing SQL is issued,
only the employee_name and employee_number columns are returned firom Exadata to the
database kernel.
SELECT employee_name, employee_number FROM employee_table.
For tables with many columns, or columns containing LOBs (Large Objects), the I/O bandwidth saved
can be very
large. Using both predicate and column filtering dramatically improves perfiormance and reduces I/O
bandwidth
consumption. In addition, column filtering also applies to indexes, allowing fior even fiaster query
perfiormance.
Refierence: Oracle Communications Data Model Implementation and Operations Guide, Exadata
Smart Scan
Processing and Storage Index