UltraLite limitations

In most cases, the memory, CPU, and storage required by most mobile devices and embedded systems impose stricter limits that typically make UltraLite the preferred database option.

To compare UltraLite limitations with SQL Anywhere limitations, see SQL Anywhere size and number limitations.

Data size and object limitations

Statistic	Maximum for UltraLite
Number of connections per database	Up to 14 for single threaded applications.
Number of concurrent open connections	Up to 8 for Palm OS. Up to 32 for all other OS.
Total number of concurrent connections per application	Up to 16 on Palm OS. Up to 64 for all other OS.
SQL communication areas	Up to 63.
File-based persistent store (database size)	2 GB file or OS limit on file size.
Palm Computing Platform database size	128 MB (primary storage). 2 GB (expansion card file system).
Rows per table	Up to 16 million.¹
Rows per database	Limited by persistent store.
Table size	Limited only by database size.
Tables per database	Limited only by database size.
Columns per table	Row size is limited by page size, so the practical limit on the number of columns per table is derived from this size. Typically, this practical limit is much less than 4000.
Indexes per table	Limited only by database size.
Tables referenced per transaction	No limit.
Stored procedure length	Not applicable.
Stored procedures per database	Not applicable.
Triggers per database	Not applicable.
Nesting	Not applicable.
Number of publications	32 publications.
Page size	16 KB.
Row size	The length of each packed row must not exceed the page size. See Row packing and table definitions. Character strings are stored without padding when they are shorter than the column size. This restriction excludes columns declared as long binary and long varchar as these are stored separately.
Long binary/long varchar size	Limited only by database size.

¹ In some cases, changes to the row (deletes and updates) and other state information are maintained along with the row data. This information allows those changes to be synchronized. Consequently, the actual row limit can be smaller than 16 million, depending on the number of transactions on a table between synchronization, or whether the table is synchronized at all. See UltraLite transaction processing.

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