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10 Recompile the broken synonym:
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alter synonym emp_s compile;
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Note that this does not give an error, but rerun the query from Step 9 It is definitely still broken 11 Tidy up by dropping the synonyms:
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drop synonym emp_s; drop synonym dept_s; drop synonym dsum_s;
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A sequence is a structure for generating unique integer values Only one session can read the next value and thus force it to increment This is a point of serialization, so each value generated will be unique Sequences are an invaluable tool for generating primary keys Many applications will need automatically generated primary key values Examples in everyday business data processing are customer numbers or order numbers: the business analysts will have stated that every order must have a unique number, which should continually increment Other applications may not have such a requirement in business terms, but it will be needed to enforce relational integrity Consider a telephone billing system: in business terms the unique identifier of a telephone is the telephone number (which is a string) and that of a call will be the source telephone number and the time the call began (which is a timestamp) These data types are unnecessarily complex to use as primary keys for the high volumes that go through a telephone switching system While this information will be recorded, it will be much faster to use simple numeric columns to define the primary and foreign keys The values in these columns can be sequence based The sequence mechanism is independent of tables, the row locking mechanism, and commit or rollback processing This means that a sequence can issue thousands of unique values a minute far faster than any method involving selecting a column from a table, updating it, and committing the change Figure 7-6 shows two sessions selecting values from a sequence SEQ1 Note that in the figure, each selection of SEQ1NEXTVAL generates a unique number The numbers are issued consecutively in order of the time the selection was made, and the number increments globally, not just within one session
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The full syntax for creating a sequence is as follows:
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CREATE SEQUENCE [schema]sequencename [INCREMENT BY number] [START WITH number] [MAXVALUE number | NOMAXVALUE] [MINVALUE number | NOMINVALUE] [CYCLE | NOCYCLE] [CACHE number | NOCACHE] [ORDER | NOORDER] ;
7: DDL and Schema Objects
PART II
Figure 7-6 Use of a sequence by two sessions concurrently
It can be seen that creating a sequence can be very simple For example, the sequence used in Figure 7-6 was created with
create sequence seq1;
The options are shown in the following table
INCREMENT BY How much higher (or lower) than the last number issued should the next number be Defaults to +1 but can be any positive number (or negative number for a descending sequence) The starting point for the sequence: the number issued by the first selection Defaults to 1 but can be anything The highest number an ascending sequence can go to before generating an error or returning to its START WITH value The default is no maximum The lowest number a descending sequence can go to before generating an error or returning to its START WITH value The default is no minimum Controls the behavior on reaching MAXVALUE or MINVALUE The default behavior is to give an error, but if CYCLE is specified the sequence will return to its starting point and repeat For performance, Oracle can preissue sequence values in batches and cache them for issuing to users The default is to generate and cache the next 20 values Only relevant for a clustered database: ORDER forces all instances in the cluster to coordinate incrementing the sequence, so that numbers issued are always in order even when issued to sessions against different instances
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