Several years ago, an IBMer was on a mission to raise or eliminate many of the upper limits in OS/400--for example, to increase the maximum length of an index for a file from 120 bytes to the 2000 bytes we have today.
Recently, while teaching at a client's office, I was asked about database limits. What's the maximum width of a database record? What is the maximum number of records in a file? And so forth. So I put together a little table of maximums for database. The original source for these figures is, like everything, in the various IBM manuals as well as the InfoCenter at IBM.
| Database Item | Limit |
| Fields in a record format | 8,000 |
| Bytes in a record format | 32,766 |
| Bytes in a database file | 1 TB |
| Fields that make up an index entry | 120 |
| Bytes in an index entry | 2,000 |
| Bytes in an entire index | 1 TB |
| Records in a file | 4 GB |
| Indexes over a physical file member | 4000 |
| Members that may be joined (using DDS) | 32 |
| Members that may be joined (using SQL) | 256 |
| Records locked for a commitment control transaction | About 500,000,000 |
| Triggers on a file | 300 |
| Members in a file | 32,767 |
| Files that may be used at one time | 500,000 |
| Length of a character field in database | 32,765 |
| 8-byte INT (20I0 in RPG) | From: -922,337,2036,854,775,808 To: +922,337,2036,854,775,807 |
| 4-byte INT (10I0 in RPG) | From: -2,147,483,648 To: +2,147,483,647 |
| 2-byte INT (5I0 in RPG) | From: -32,768 To: +32,767 |
| 1-byte INT (3I0 in RPG) | From: -256 to +255 |
| Length of a packed/zoned decimal value | V5R2: 31 V5R3: 63 |
| Objects in a library | 360,000 |
| Files that can be open at one time by the file server | 16,776,960 |
| Bytes for a Domino database | 256 GB |
| Records in a version of the history log | 65,535 |
| Input fields on a display file at one time | 256 |
Bob Cozzi has been programming in RPG since 1978. Since then, he has written many articles and several books, including The Modern RPG Language--the most widely used RPG reference manual in the world. Bob is also a very popular speaker at industry events such as RPG World and is the author of his own Web site and of the RPG ToolKit, an add-on library for RPG IV programmers.
Bob Cozzi is a programmer/consultant, writer/author, and software developer. His popular RPG xTools add-on subprocedure library for RPG IV is fast becoming a standard with RPG developers. His book The Modern RPG Language has been the most widely used RPG programming book for more than a decade. He, along with others, speaks at and produces the highly popular RPG World conference for RPG programmers.
MC Press books written by Robert Cozzi available now on the MC Press Bookstore.
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Business users want new applications now. Market and regulatory pressures require faster application updates and delivery into production. Your IBM i developers may be approaching retirement, and you see no sure way to fill their positions with experienced developers. In addition, you may be caught between maintaining your existing applications and the uncertainty of moving to something new.
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