Found that below dataset contain more than 1 extent. How to enlarge the dataset
Dataset Name XT
Release : 12.1
CA 7 delivers sample JCL in library CAL2JCL member AL2DCC40 to help you resize any of the database data areas that require a larger allocation.
To increase the size of the HIS770 and other database areas, please follow the instructions for backing up the files using CAL2JCL(AL2DBKUP).
The job you can use to reallocate your space is also in CAL2JCL(AL2DCC40). You can comment out any area you do not wish to increase.
(1). Run CAL2JCL(AL2DBKUP)
(2). rename the current HIS770 data set to dsn.old
(3). allocate a larger HIS770 data set with name SYSL.CA7.R12M1.SYSB.HIS770 with PRIMARY and SECONDARY allocations using CAL2JCL(AL2DCC40)
(4). look at CAL2JCL(AL2DLOAD)
add INIT AREA=HIS,DBID=770 after INIT AREA=IXX,DBID=770 in step LOAD
(5). run this modified AL2DLOAD job
(6). if all is fine then you can delete dsn.old
Once done, you may want to run CXX report to see the new allocation.
Run a DBUTLTY job with SYSIN cards: