z/OS V1R6.0 DFSMS Access Method Services for Catalogs

DEFINE CLUSTERresident or reserved. When the FILE parameter is used, the specified volumesare directly allocated before access method services gets control.An example DD statement is://ddname DD UNIT=(devtype[,unitcount]),// VOL=SER=(volser1,volser2,volser,...),DISP=OLDRestriction: When FILE refers to more than one volume of the same devicetype, the DD statement that describes the volumes cannot be a concatenatedDD statement.FREESPACE(CI-percent[ CA-percent]|0 0)Specifies the percentage of each control interval and control area to be set asideas free space when the cluster is initially loaded or when a mass insert is done.CI-percent is a percentage of the amount of space to be preserved for addingnew records and updating existing records with an increase in the length of therecord. Since a CI is split when it becomes full, the CA might also need to besplit when it is filled by CIs created by a CI split. The empty space in thecontrol interval and control area is available for data records that are updatedand inserted after the cluster is initially loaded. This parameter applies only tokey-sequenced clusters, and variable-length relative records withvariable-length records. CI-percent is the number of bytes that is equal to, orslightly less than, the percentage value of CI-percent. CA-percent is the numberof control intervals equal to, or less than, the percentage of CA-percent.CI-percent and CA-percent must be equal to, or less than, 100. When you useFREESPACE(100 100), one data record is placed in each control interval usedfor data. One control interval in each control area is used for data (that is, onedata record is stored in each control area when the data set is loaded). If youdo not use FREESPACE, the default reserves no free space when the data set isloaded.When you define the cluster using the RECORDS parameter, the amount offree space specified is not considered in the calculations to determine primaryallocation.Abbreviation: FSPC||||||||||||||||||FRLOG(ALL|NONE|REDO|UNDO)Specifies if VSAM batch logging can be performed for your VSAM data set.VSAM batch logging is available with CICS VSAM Recovery V3R1.There is no default value for FRLOG. If FRLOG is left out, the data set cannotbe used for VSAM batch logging. See the ALTER command for enabling VSAMbatch logging after a data set is created.ALLEnables the changes made to your VSAM data set to be both backed outand forward recovered using the VSAM logging. The LOGSTREAMIDparameter indicates the changes that are made by applications that arewritten to the MVS log stream. When specifying FRLOG(ALL), you mustalso specify LOGSTREAMID.NONEIndicates that the data set can be used for VSAM batch logging. However,the function should be disabled. The LOGSTREAMID parameter indicateschanges that are made by applications that are written to the MVS logstream. Specifying FRLOG(NONE) implies that you may use the data setfor RLS processing; omitting it indicates that RLS processing will not occur.Chapter 14. DEFINE CLUSTER 155