Appendix A. SQL limits

The following tables describe certain SQL and database limits imposed by the DB2 UDB for iSeries database manager.

Note:

System storage limits may preclude the limits specified here. For example, see Maximum row sizes.
A limit of storage means that the limit is dependent on the amount of storage available.
A limit of statement means that the limit is dependent on the limit for the maximum length of a statement.

Table 76. Identifier Length Limits
Identifier Limits	DB2 UDB for iSeries Limit
Longest authorization name	10⁸³
Longest correlation name	128
Longest cursor name	18
Longest descriptor name	128
Longest external program name (string form)	279⁸⁴
Longest external program name (unqualified form)	10
Longest host identifier⁸⁵	64
Longest package version-id	64
Longest partition name	10
Longest savepoint name	128
Longest schema name	10
Longest server name	18
Longest statement name	18
Longest SQL condition name	128
Longest SQL label	128
Longest unqualified alias name	128
Longest unqualified column name	128
Longest unqualified constraint name	128
Longest unqualified distinct type name	128
Longest unqualified function name	128
Longest unqualified index name	128
Longest unqualified nodegroup name	10
Longest unqualified package name	10
Longest unqualified procedure name	128
Longest unqualified sequence name	128
Longest unqualified specific name	128
Longest unqualified SQL parameter name	128
Longest unqualified SQL variable name	128
Longest unqualified system column name	10
Longest unqualified system table, view, and index name	10
Longest unqualified table and view name	128
Longest unqualified trigger name	128

Table 77. Numeric Limits
Numeric Limits	DB2 UDB for iSeries Limit
Smallest SMALLINT value	-32 768
Largest SMALLINT value	+32 767
Smallest INTEGER value	-2 147 483 648
Largest INTEGER value	+2 147 483 647
Smallest BIGINT value	-9 223 372 036 854 775 808
Largest BIGINT value	+9 223 372 036 854 775 807
Largest decimal precision	63
Smallest DOUBLE value⁸⁶	-1.79x10³⁰⁸
Largest DOUBLE value⁸⁶	+1.79x10³⁰⁸
Smallest positive DOUBLE value⁸⁶	+2.23x10^-308
Largest negative DOUBLE value⁸⁶	-2.23x10^-308
Smallest REAL value⁸⁶	-3.4x10³⁸
Largest REAL value⁸⁶	+3.4x10³⁸
Smallest positive REAL value⁸⁶	+1.18x10^-38
Largest negative REAL value⁸⁶	-1.18x10^-38

Table 78. String Limits
String Limits	DB2 UDB for iSeries Limit
Maximum length of CHAR (in bytes)	32765⁸⁷
Maximum length of VARCHAR (in bytes)	32739⁸⁷
Maximum length of CLOB (in bytes)	2 147 483 647
Maximum length of GRAPHIC (in double-byte characters)	16382⁸⁷
Maximum length of VARGRAPHIC (in double-byte characters)	16369⁸⁷
Maximum length of DBCLOB (in double-byte characters)	1 073 741 823
Maximum length of BINARY (in bytes)	32765⁸⁷
Maximum length of VARBINARY (in bytes)	32739⁸⁷
Maximum length of BLOB (in bytes)	2 147 483 647
Maximum length of character constant	32740
Maximum length of a graphic constant	16370
Maximum length of binary constant	32740
Maximum length of concatenated character string	2 147 483 647
Maximum length of concatenated graphic string	1 073 741 823
Maximum length of concatenated binary string	2 147 483 647
Maximum number of hexadecimal constant digits	32 762
Maximum length of catalog comments	2000⁸⁸
Maximum length of column label	60
Longest SQL routine label	128
Longest table, package, or alias label	50
Maximum length of C NUL-terminated	32739⁸⁷
Maximum length of C NUL-terminated graphic	16369⁸⁷

Table 79. Datetime Limits
Datetime Limits	DB2 UDB for iSeries Limit
Smallest DATE value	0001-01-01
Largest DATE value	9999-12-31
Smallest TIME value	00:00:00
Largest TIME value	24:00:00
Smallest TIMESTAMP value	0001-01-01-00.00.00.000000
Largest TIMESTAMP value	9999-12-31-24.00.00.000000

Table 80. DataLink Limits
Datalink Limits	DB2 UDB for iSeries Limit
Maximum length of DATALINK	32718
Maximum length of DATALINK comment	254

Table 81. Database Manager Limits
Database Manager Limits	DB2 UDB for iSeries Limit
Most columns in a table	8000
Most columns in a view	8000
Maximum length of a row without LOBs including all overhead	32766
Maximum length of a row with LOBs including all overhead	3 758 096 383
Maximum number of parameters in a function	90
Maximum number of parameters in a procedure	1024⁸⁹
Maximum size of a non-partitioned table	1.7 terabytes
Maximum size of an index	1 terabyte
Most rows in a non-partitioned table	4 294 967 288
Longest index key	32768
Most columns in an index key	120
Most indexes on a table	approximately 4000
Most tables referenced in an SQL statement	1000⁹⁰
Most tables referenced in a view	256⁹⁰
Most host variable declarations in a precompiled program	storage⁹¹
Most host variables and constants in an SQL statement	4096⁹²
Longest host variable used for insert or update (in bytes)	2 147 483 647
Longest SQL statement (in bytes)	2 097 152
Longest CHECK constraint (in bytes)	statement
Most elements in a select list⁹³	approximately 8000
Most predicates in a WHERE or HAVING clause	statement
Maximum number of columns in a GROUP BY clause	120
Maximum total length of columns in a GROUP BY clause	32766
Maximum number of columns in an ORDER BY clause	32766
Maximum total length of columns in an ORDER BY clause	32766
Maximum size of an SQLDA	16 777 215
Maximum number of prepared statements	storage
Most declared cursors in a program	storage
Maximum number of cursors opened at one time	storage ⁹⁴
Most tables in a relational database	storage
Maximum number of triggers on a table	300
Maximum number of nested trigger invocations	200
Maximum length of a password	128
Maximum number of constraints on a table	300
Maximum length of a path	3483⁹⁵
Maximum number of schemas in a path	268
Maximum length of a hint	32
Maximum number of objects in a schema	approximately 360 000
Maximum levels allowed for a subselect	256
Maximum number of rows changed in a unit of work	500 000 000
Maximum number of locators in a transaction	16 000 000 ⁹⁶
Maximum number of savepoints active at one time	storage
Maximum number of simultaneously allocated CLI handles in a process	160 000 ⁹⁷
Maximum number of nodes in a nodegroup	32
Maximum number of partitions in a partitioned table	256
Maximum size of a package	500 megabytes

83.

As an application requester, DB2 UDB for iSeries can send an authorization name of up to 255 bytes.

84.

For REXX procedures, the limit is 33.

85.

For a C program, the limit is 128.

86.

The values shown are approximate.

87.

If the column is NOT NULL, the maximum is one more.

88.

For sequences the limit is 500.

89.

SQL procedures are limited to 1024 parameters. The number of parameters for external procedures depends on the PARAMETER STYLE:

PARAMETER STYLE GENERAL has a maximum of 1024.
PARAMETER STYLE GENERAL WITH NULLS has a maximum of 1023.
PARAMETER STYLE SQL or PARAMETER STYLE DB2SQL has a maximum of 508.
PARAMETER STYLE JAVA or PARAMETER STYLE DB2GENERAL has a maximum of 90.

The maximum number of parameters for external procedures is also limited by the maximum number of parameters allowed by the licensed program used to compile the external program.

90.

The maximum number of members (and partitions) referenced is also 256.

91.

In RPG/400® and PL/I programs when the old parameter passing technique is used, the limit is approximately 4000. The limit is based on the number of pointers allowed in the program. In all other cases, the limit is based on operating system constraints.

92.

If the statement is not read-only, the limit is 2048. The limit is approximate and may be less if very large string constants or string variables are used.

93.

The limit is based on the size of internal structures generated for the parsed SQL statement.

94.

The maximum number of cursors open at one time in a single job is approximately 21 754.

95.

The maximum length of a path in DRDA® is 255.

96.

The maximum number of locators in a transaction in SQL Server mode is 209 000.

97.

The maximum number of allocated handles per DRDA connection is 500.

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