String waits

To display the files currently experiencing VSAM string or LSR buffer waits, select the VSAM String Waits option (I) on the Files path or enter fast path F.I from any panel.

The VSAM String and Buffer Waits panel is displayed in the following figure:

Figure 1. String and Buffer Waits Panel (F.I)

____________  ZCVSW    VTM     CICSSP31 V530./C SP22 11/23/13 15:51:03 
> PF1 Help     PF3 Back     PF4 Main Menu     PF7 Up    PF8 Down     PF11 Zoom

> A-Application Datasets   B-CICS Datasets      C-STEPLIB       D-JES Datasets
> E-VSAM Datasets          F-LSR Pools          G-DFHRPL        H-All Datasets
> I-VSAM String Waits      J-Journal Datasets   K-IMS Datasets  L-Select Files
===============================================================================

>                         VSAM STRING and BUFFER WAITS CVSW
+      File      Tran          Task  Task      String   Resource  Resource
+      ID        ID          Number  Status    Type     Type      Name
+      --------  --------  --------  --------  -------- --------  --------
+      DEG       DEGV            57  Waiting   Add/upd  FCPSWAIT  DEG
+      DEG       DEGV            38  Owning    Add/upd  KCCOMPAT  SUSPEND
+
+      File id=DEG     : Current LSR buffer wait count=1, high water mark=3
================================================================================

Each string represents a concurrent request for access to a VSAM file. The summary display shows, for each file, the tasks that are currently using strings and the tasks that are waiting for strings and LSR buffers. Information appears only for files that are defined in the FCT.

For tasks holding strings, OMEGAMON for CICS (3270) displays the wait reason and resource causing the wait. Since certain waits, such as a TC-I/O wait for terminal input could be long-running, you might want to purge that task to free up the string.

You can display detailed information for the task by placing the cursor on the transaction ID and pressing PF11. For information on the task detail display and the steps required to purge a task, see Task detail and Killing a task.

To see detailed information on a file, place the cursor on the filename and press PF11. OMEGAMON for CICS (3270) displays detailed file information as shown in VSAM File Detail Panel (Accessed by Zoom).