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DDML, a language based on XML (Extensible Markup Language), allows you to logically define the entities you want to add to the Precise schema, such as tables, views, indexes, foreign keys, and all other required components. It covers the common entities available in most popular DBMSs.
After you have defined all database entities in DDML, you must run the DDML creation script to physically create the entities in the database.
General DDML document format
The general format of a DDML document looks as follows:
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the
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database
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<table-definition>, <ddl-definition>, and <view-definition>. The <tables-definition> tag includes the product attribute, which indicates the product of this specific DDML definition.
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Includes the table-level attributes. Its children are the <column-definition>, <index-definition>, and <foreign-key-definition> tags.
If a table is a statistics table, meaning means that the type attribute has the value STATISTICS, the <summary-hour>, <summary-day>, <summary-week>, and <summary-month> tags can be specified as children of the <table-definition> tag.
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<tables-definition> tag
Root element of the DDML document.
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Required. Holds the product short name (product shortcut) consisting if two characters that define the product.
In this case, three custom-defined products are available:
C1For customer-defined 1C2For customer-defined 2C3For customer-defined 3
<table-definition> tag
Holds all of the information included in a single table.
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Required. Specifies the table type and can hold one of the following values:
- Statistics. A PMDB table that holds information about certain database activity, summarized into hours or time slices.
- Events. A PMDB table that keeps a log of database incidents.
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Optional. Affects only Oracle and is developed as PCTFREE pctfree.
Can have a value between 0 and 99.
If the PMDB is a Microsoft SQL Server database, this attribute is transformed to fill factor.
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.
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oracle-storage-clause="initial 1M next 1M minextents 1maxextents unlimited pctincrease 100"
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The <table-definition> tag can have the following
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<column-definition><index-definition><foreign-key-definition>
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Optional. Instructs to define an hour-level summary table for this table. Used for time slice statistics tables.
The name of the summary table is specified by the name attribute (required). The summary table name should follow the naming conventions specified in Naming conventions.
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Optional. Instructs to define a day-level summary table for this table.
The name of the summary table is specified by the name attribute (required). The summary table name should follow the naming conventions specified in Naming conventions.
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Optional. Instructs to define a week-level summary table for this table.
The name of the summary table is specified by the name attribute (required). The summary table name should follow the naming conventions specified in Naming conventions.
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Optional. Instructs to define a month-level summary table for this table.
The name of the summary table is specified by the name attribute (required). The summary table name should follow the naming conventions specified in Naming conventions.
<ddl-definition> tag
Holds DDL (Data Definition Language) and DML (Data Manipulation Language) statements that can be performed during installation or uninstallation, such as stored procedures.
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