> For the complete documentation index, see [llms.txt](https://docs.editran.onesait.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.editran.onesait.com/documentacion-editran/ibm-editran-v5.3-cics-en/definition-and-management-of-buffer-files/definition-in-the-vsam-catalog.md).
# Definition in the VSAM catalog
## Specific Buffer
It is defined and deleted by editran/G through calls to “IDCAMS”. It contains a single transmission session.
It only needs to be defined in CICS, since it is editran/G that defines and deletes it based on the profile data.
In any case, the ZTBPJITE jcl defines a specific buffer file with the following characteristics:
```
DEFINE CLUSTER -
(NAME(KI.EGDC.ZTBP.ZTBPFR1) -
VOL(DES801) -
FREESPACE(25 25) -
REC (100 100) -
RECORDSIZE(04074 04074) -
SHAREOPTIONS(2 3) -
KEYS(36 0) -
INDEXED ) -
DATA -
(NAME(KI.EGDC.ZTBP.ZTBPFR1.DATA)) -
INDEX -
(NAME(KI.EGDC.ZTBP.ZTBPFR1.INDEX))
/*
```
## Matrix Buffer
It is advisable that it be defined by the user; this way, they have the opportunity to specify the number of records they consider appropriate.
To define it, there is a jcl (ZTBPJITM) that creates it with the following characteristics:
```
DEFINE CLUSTER -
(NAME(KI.EGDC.ZTBP.ZTBPFEL) -
VOL(DES502) -
FREESPACE(25 25) -
REC (500 50) -
RECORDSIZE(4074 4074) -
SHAREOPTIONS(3 3) -
KEYS(36 0) -
INDEXED ) -
DATA -
(NAME(KI.EGDC.ZTBP.ZTBPFEL.DATA)) -
INDEX -
(NAME(KI.EGDC.ZTBP.ZTBPFEL.INDEX))
/*
```
As can be seen, this type of buffer has SHAREOPTION (3,3).
If the file does not exist when the editran/G process starts, it will be defined by assigning to the number of records the sum of the records assigned to each of the transmission sessions associated with the presentation in progress.
## Unattended Buffer
It is mandatory that it be defined by the user.
To define it, there is a jcl (ZTBPJITD) that defines it with the same characteristics as the Specific Buffer, but also initializes it.
## EXCI Buffer
It is mandatory that it be defined by the user.
To define it, the same jcl is used as in the case of unattended buffers (ZTBPJITD).
## Public Buffer
It is mandatory that it be defined by the user.
It is defined in the same way as the Matrix Buffer (ZTBPJITM).
---
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