Reserved schema names and reserved words
There are restrictions on the use of certain names that are required by the database manager.
- SYSCAT
- SYSFUN
- SYSIBM
- SYSIBMADM
- SYSPROC
- SYSPUBLIC
- SYSSTAT
It is strongly recommended that schema names never begin with the 'SYS' prefix, because 'SYS', by convention, is used to indicate an area that is reserved by the system. No aliases, global variables, triggers, user-defined functions, or user-defined types can be placed into a schema whose name starts with 'SYS' (SQLSTATE 42939).
The DB2QP schema and the SYSTOOLS schema are set aside for utilities used by the database. It is recommended that users not explicitly define objects in these schemas, although their use is not prevented by the database manager.
It is recommended that schema names never begin with the 'Q' prefix, because on other Db2® database managers 'Q', by convention, is used to indicate an area reserved by the system.
It is also recommended that SESSION not be used as a schema name. Because declared temporary tables must be qualified by SESSION, it is possible to have an application declare a temporary table with a name that is identical to that of a persistent table, complicating the application logic. To avoid this possibility, do not use the schema SESSION except when dealing with declared temporary tables.
Keywords can be used as ordinary identifiers, except in a context where they could also be interpreted as SQL keywords. In such cases, the word must be specified as a delimited identifier. For example, COUNT cannot be used as a column name in a SELECT statement, unless it is delimited.
ISO/ANSI SQL2003 and other IBM® database products include reserved words that are not enforced by Db2; however, it is recommended that these words not be used as ordinary identifiers, because it reduces portability.
ACTIVATE DOUBLE LOCALE RESULT WLM
ADD DROP LOCALTIME RESULT_SET_LOCATOR WRITE
AFTER DSSIZE LOCALTIMESTAMP RETURN XMLELEMENT
ALIAS DYNAMIC LOCATOR RETURNS XMLEXISTS
ALL EACH LOCATORS REVOKE XMLNAMESPACES
ALLOCATE EDITPROC LOCK RIGHT YEAR
ALLOW ELSE LOCKMAX ROLE YEARS
ALTER ELSEIF LOCKSIZE ROLLBACK
AND ENABLE LONG ROUND_CEILING
ANY ENCODING LOOP ROUND_DOWN
AS ENCRYPTION MAINTAINED ROUND_FLOOR
ASENSITIVE END MATERIALIZED ROUND_HALF_DOWN
ASSOCIATE END-EXEC MAXVALUE ROUND_HALF_EVEN
ASUTIME ENDING MICROSECOND ROUND_HALF_UP
AT ERASE MICROSECONDS ROUND_UP
ATTRIBUTES ESCAPE MINUTE ROUTINE
AUDIT EVERY MINUTES ROW
AUTHORIZATION EXCEPT MINVALUE ROWNUMBER
AUX EXCEPTION MODE ROWS
AUXILIARY EXCLUDING MODIFIES ROWSET
BEFORE EXCLUSIVE MONTH ROW_NUMBER
BEGIN EXECUTE MONTHS RRN
BETWEEN EXISTS NAN RUN
BINARY EXIT NEW SAVEPOINT
BUFFERPOOL EXPLAIN NEW_TABLE SCHEMA
BY EXTENDED NEXTVAL SCRATCHPAD
CACHE EXTERNAL NO SCROLL
CALL EXTRACT NOCACHE SEARCH
CALLED FENCED NOCYCLE SECOND
CAPTURE FETCH NODENAME SECONDS
CARDINALITY FIELDPROC NODENUMBER SECQTY
CASCADED FILE NOMAXVALUE SECURITY
CASE FINAL NOMINVALUE SELECT
CAST FIRST1 NONE SENSITIVE
CCSID FOR NOORDER SEQUENCE
CHAR FOREIGN NORMALIZED SESSION
CHARACTER FREE NOT2 SESSION_USER
CHECK FROM NOTNULL SET
CLONE FULL NULL SIGNAL
CLOSE FUNCTION NULLS SIMPLE
CLUSTER GENERAL NUMPARTS SNAN
COLLECTION GENERATED OBID SOME
COLLID GET OF SOURCE
COLUMN GLOBAL OFF SPECIFIC
COMMENT GO OFFSET SQL
COMMIT GOTO OLD SQLID
CONCAT GRANT OLD_TABLE STACKED
CONDITION GRAPHIC ON STANDARD
CONNECT GROUP OPEN START
CONNECTION HANDLER OPTIMIZATION STARTING
CONSTRAINT HASH OPTIMIZE STATEMENT
CONTAINS HASHED_VALUE OPTION STATIC
CONTINUE HAVING OR STATMENT
COUNT HINT ORDER STAY
COUNT_BIG HOLD OUT STOGROUP
CREATE HOUR OUTER STORES
CROSS HOURS OVER STYLE
CURRENT IDENTITY OVERRIDING SUBSTRING
CURRENT_DATE IF PACKAGE SUMMARY
CURRENT_LC_CTYPE IMMEDIATE PADDED SYNONYM
CURRENT_PATH IMPORT PAGESIZE SYSFUN
CURRENT_SCHEMA IN PARAMETER SYSIBM
CURRENT_SERVER INCLUDING PART SYSPROC
CURRENT_TIME INCLUSIVE PARTITION SYSTEM
CURRENT_TIMESTAMP INCREMENT PARTITIONED SYSTEM_USER
CURRENT_TIMEZONE INDEX PARTITIONING TABLE
CURRENT_USER INDICATOR PARTITIONS TABLESPACE
CURSOR INDICATORS PASSWORD THEN
CYCLE INF PATH TIME
DATA INFINITY PERCENT TIMESTAMP
DATABASE INHERIT PIECESIZE TO
DATAPARTITIONNAME INNER PLAN TRANSACTION
DATAPARTITIONNUM INOUT POSITION TRIGGER
DATE INSENSITIVE PRECISION TRIM
DAY INSERT PREPARE TRUNCATE
DAYS INTEGRITY PREVVAL TYPE
DB2GENERAL INTERSECT PRIMARY UNDO
DB2GENRL INTO PRIQTY UNION
DB2SQL IS PRIVILEGES UNIQUE
DBINFO ISNULL PROCEDURE UNTIL
DBPARTITIONNAME ISOBID PROGRAM UPDATE
DBPARTITIONNUM ISOLATION PSID USAGE
DEALLOCATE ITERATE PUBLIC USER
DECLARE JAR QUERY USING
DEFAULT JAVA QUERYNO VALIDPROC
DEFAULTS JOIN RANGE VALUE
DEFINITION KEEP RANK VALUES
DELETE KEY READ VARIABLE
DENSERANK LABEL READS VARIANT
DENSE_RANK LANGUAGE RECOVERY VCAT
DESCRIBE LAST3 REFERENCES VERSION
DESCRIPTOR LATERAL REFERENCING VIEW
DETERMINISTIC LC_CTYPE REFRESH VOLATILE
DIAGNOSTICS LEAVE RELEASE VOLUMES
DISABLE LEFT RENAME WHEN
DISALLOW LIKE REPEAT WHENEVER
DISCONNECT LIMIT RESET WHERE
DISTINCT LINKTYPE RESIGNAL WHILE
DO LOCAL RESTART WITH
DOCUMENT LOCALDATE RESTRICT WITHOUT
ABS GROUPING REGR_INTERCEPT
ARE INT REGR_R2
ARRAY INTEGER REGR_SLOPE
ASYMMETRIC INTERSECTION REGR_SXX
ATOMIC INTERVAL REGR_SXY
AVG LARGE REGR_SYY
BIGINT LEADING ROLLUP
BLOB LN SCOPE
BOOLEAN LOWER SIMILAR
BOTH MATCH SMALLINT
CEIL MAX SPECIFICTYPE
CEILING MEMBER SQLEXCEPTION
CHAR_LENGTH MERGE SQLSTATE
CHARACTER_LENGTH METHOD SQLWARNING
CLOB MIN SQRT
COALESCE MOD STDDEV_POP
COLLATE MODULE STDDEV_SAMP
COLLECT MULTISET SUBMULTISET
CONVERT NATIONAL SUM
CORR NATURAL SYMMETRIC
CORRESPONDING NCHAR TABLESAMPLE
COVAR_POP NCLOB TIMEZONE_HOUR
COVAR_SAMP NORMALIZE TIMEZONE_MINUTE
CUBE NULLIF TRAILING
CUME_DIST NUMERIC TRANSLATE
CURRENT_DEFAULT_TRANSFORM_GROUP OCTET_LENGTH TRANSLATION
CURRENT_ROLE ONLY TREAT
CURRENT_TRANSFORM_GROUP_FOR_TYPE OVERLAPS TRUE
DEC OVERLAY UESCAPE
DECIMAL PERCENT_RANK UNKNOWN
DEREF PERCENTILE_CONT UNNEST
ELEMENT PERCENTILE_DISC UPPER
EXEC POWER VAR_POP
EXP REAL VAR_SAMP
FALSE RECURSIVE VARBINARY
FILTER REF VARCHAR
FLOAT REGR_AVGX VARYING
FLOOR REGR_AVGY WIDTH_BUCKET
FUSION REGR_COUNT WINDOW
WITHIN