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SAP Sybase SQL Anywhere 16.0 » MobiLink - Server Administration » MobiLink server technology » Synchronization techniques » Unique primary keys » GLOBAL AUTOINCREMENT



You can set default values in your database by selecting the column properties in Sybase Central, or by including the DEFAULT GLOBAL AUTOINCREMENT phrase in a CREATE TABLE or ALTER TABLE statement.

Optionally, the partition size can be specified in parentheses immediately following the AUTOINCREMENT keyword. The partition size may be any positive integer, although the partition size is generally chosen so that the supply of numbers within any one partition is rarely, if ever, exhausted.

For columns of type INT or UNSIGNED INT, the default partition size is 216 = 65536; for columns of other types the default partition size is 232 = 4294967296. Since these defaults may be inappropriate, especially if your column is not of type INT or BIGINT, it is best to specify the partition size explicitly.

For example, the following SQL statement creates a simple table with two columns: an integer that holds a customer identification number and a character string that holds the customer's name. The partition size is set to 5000, which would be appropriate for an application database where few new rows are inserted in each remote database.

CREATE TABLE customer (
 name VARCHAR(128) NOT NULL,
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