Computer World. Матросова Т.А. - 61 стр.

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60
agement system are the storage manager, the query processor, and the
transaction manager;
♦ The Storage Manager: This component is responsible for storing data,
metadata (information about the schema or structure of the data), indexes
(data structures to speed the access to data), and logs (records of changes
to the database). This material is kept on disk. An important storage-
management component is the buffer manager, which keeps portions of
the disk contents m main memory;
♦ The Query Processor: This component parses queries, optimizes them by
selecting a query plan, and executes the plan on the stored data;
♦ The Transaction Manager: This component is responsible for logging
database changes to support recovery after a system crashes. It also sup-
ports concurrent execution of transactions in a way that assures atomicity
(a transaction is performed either completely or not at all), and isolation
(transactions are executed as if there were no other concurrently executing
transactions).
TEXT 7
Translate the text in written form.
THE EVOLUTION OF OBJ ECT-ORI ENTED DATABAS ES
Object-oriented database research and practice dates back to the late 1970’s and
had become a significant research area by the early 1980’s, with initial commercial
product offerings appearing in the late 1980’s. Today, there are many companies
marketing commercial object-oriented databases that are second generation products.
The growth in the number of object-oriented database companies has been
remarkable. As both the user and vendor communities grow there will be a user pull
to mature these products to provide robust data management systems.
UNI T 6
COMPUTER SECURITY
TEXT 1
Look through the text and comment on its title.
HOW TO BECOME A HACKER
Looking for advice on how to learn to crack passwords, sabotage systems,
mangle websites, write viruses, and plant Trojan horses? You came to the wrong
place. I'm not that kind of hacker.

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