Steps In Creating A Join Index - Sybase Adaptive Server IQ 12.4.2 Administration And Performance Manual

Steps in creating a join index

Of course, this approach requires more disk space to build an additional join
index and more index building time (not to mention increased maintenance). In
the case of a subset join index, the additional join index repeats a subset of the
information already in the full join index. You must decide whether the query
speed or disk space usage of your application is more important for this
particular join relationship.
In order to create a join index you must perform all of the following steps:
1 Create the tables involved in the join index, using the
command, or using Sybase Central.
2 Identify the join condition that relates specific pairs of columns in the
underlying tables involved in any one join. Where the relationship is based
on a key join, you must define join conditions as referential integrity
constraints—primary and foreign key declarations—in the
commands in step 1, or in
TABLE
3 Create column indexes for the tables being joined.
When Adaptive Server IQ creates a join index between tables, the IQ
column index types and data types already defined on the single tables are
used in the join index.
4 Load the data into the tables, using the
can add data to existing tables using the
Note You must insert into the column index of each table in the join index
as a single-table insert, rather than into the join index itself. This approach
conforms to ANSI rules for prejoined data.
5 Create the join index by issuing the
Sybase Central with the Add JoinIndex Wizard. You specify the join
hierarchy as part of this step, as described in "Join hierarchy overview".
Note If data exists in the join tables, a synchronize occurs automatically.
6 Depending on the order in which you perform these steps, you may need
to synchronize the tables in the join index, as described below. If data
exists in the join tables, synchronization occurs automatically.
CHAPTER 4 Adaptive Server IQ Indexes
commands.
ALTER TABLE
LOAD TABLE
INSERT INTO
CREATE JOIN INDEX
CREATE TABLE
CREATE
command. You also
command.
command, or in
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