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Figure 9-6 in this chapter shows an entity-relationship diagram for a simple system designed to store and analyze sales The columns for the fact table SALES are SALE_ID CHANNEL_ID PRODUCT_ID SHOP_ID DAY_ID QUANTITY system-generated primary key foreign key to CHANNELS foreign key to PRODUCTS foreign key to SHOPS foreign key to DAYS the quantity of the product sold
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It is expected that there will be several million SALES rows per year The dimension tables are PRODUCTS CHANNEL SHOPS DAYS a list of all products, including price Cardinality of a few hundred possible sales methods, such as walk-in, Internet, and telephone details of all the shops, including ZIP code no more than a couple of dozen dates for which sales are being stored: 365, identified by day number
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Write code to create the tables, with appropriate indexes and constraints Consider what type of indexes will be appropriate
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Lab Question
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Design a temporary table to be used for reporting purposes This table should be a denormalized version of the data, which will include all the columns of the SALES fact table plus some columns from the dimension tables that will be useful for analysis: the price of the product, the description of the channel, the ZIP code of the shop, and the date of the sale A query will be needed to extract data from the source tables and insert it into the temporary table The work done on the temporary table will include updates, so that reports can be run on projected future changes; the data in it should therefore persist after committing changes
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1 D and E A table name can neither begin with a digit nor be a reserved word A and B are wrong because the use of double quotes means they will not cause errors C is wrong because it is a legal table name 2 A Indexes have their own namespace B, C, D, and E Stored procedures, synonyms, tables, and views all shared the same namespace 3 D STRING is not an internal datatype A, B, and C CHAR, FLOAT, and INTEGER are all internal datatypes 4 C Both DATE and TIMESTAMP can store per-second information A and B are wrong because both would be correct, not one D is wrong because all the date-time datatypes store both the data and the time
Manage Constraints
5 C and D Unique and primary key constraints need an index A and B NOT NULL and CHECK constraints are not enforced with indexes 6 C This correctly describes the result of a constraint violation A is wrong because only the one statement is rolled back B is wrong because there will be no COMMIT D is wrong because there will be no COMMIT E is wrong because the whole statement, not just the failing update, will be rolled back
Create Indexes
7 D All the statements are wrong A is wrong because compound indexes need not be on columns of the same datatype B is wrong because the columns in a compound index need not be physically adjacent C is wrong because indexes and tables do not share the same namespace 8 A, D, and E Compression, reverse key, and unique can only be applied to B*Tree indexes B, C, and F Descending, function-based, and compound indexes can be either B*Tree or bitmap
Test Answer
Create and Use Temporary Tables
9 A Rows in a temporary table are visible only the inserting session B, C, and D All these incorrectly describe the scope of visibility of rows in a temporary table 10 B If a temporary table cannot fit in a session s PGA, it will be written to the session s temporary tablespace A is wrong because temporary tables can be written out to temporary segments C is wrong because the location of the temporary segment is session specific, not table specific D is wrong because it is the session server process that writes the data, not the user process
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