Monday, January 19, 2015

ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired

This happened to me when I was trying to drop a table. It means that the table is being used and locked by another process. Following are the steps to solve such a problem.

1. If you have just executed a non select SQL, do a commit or rollback to let it release the resources that it holds. Then, try to drop the table again. If this does not solve your problem, perform step 2 and step 3 below.

2. Identify the session that holds the resources by executing the following SQL.

      SET LINESIZE 100
   
       SELECT s.INST_ID, s.SID, s.SERIAL#, p.SPID, s.USERNAME, s.PROGRAM
       FROM gv$session s, gv$process p
       WHERE p.addr = s.paddr AND p.inst_id = s.inst_id
              AND s.type != 'BACKGROUND';

      You will see something like this.
          INST_ID        SID    SERIAL# SPID       USERNAME   PROGRAM
---------- ---------- ---------- ---------- ---------- ---------------------------------------------
         1                       77        241         5448             CJOHN        JDBC Thin Client
         1                       163      60667     5466             STAO           JDBC Thin Client
         1                       195      827         8836             STAO           JDBC Thin Client
         1                       233      403         5476             EJAY            JDBC Thin Client
         1                       15        321         5159             EJAY            JDBC Thin Client
       
    Use the PROGRAM and USERNAME to identify the SPID that holds the resources.

3. Kill the process that holds the resources
    At your command line type kill -9 <spid> and then return.

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