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ORA-08104: this index object 762389 is being online built or rebuilt

Try to rebuild an index online, get ORA-08104:

SQL> ALTER INDEX TESTUSER.tbl_idx_01 rebuild online;
ALTER INDEX TESTUSER.tbl_idx_01 rebuild online
*
ERROR at line 1:
ORA-08104: this index object 762389 is being online built or rebuilt

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Datapump ORA-31626 ORA-31638 ORA-31632 ORA-00942

Datapump expdp finished, but generated errors :

ORA-31626: job does not exist
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 79
ORA-06512: at "SYS.KUPV$FT", line 405
ORA-31638: cannot attach to job SYS_EXPORT_SCHEMA_01 for user TETSUSER
ORA-31632: master table "TESTUSER.SYS_EXPORT_SCHEMA_01" not found, 
           invalid, or inaccessible
ORA-00942: table or view does not exist
SQL> SELECT owner_name, job_name, operation, job_mode,
            state, attached_sessions
FROM dba_datapump_jobs;

OWNER_NAME JOB_NAME             OPERATION  JOB_MODE STATE      ATTACHED_SESSIONS
---------- -------------------- ---------- -------- ---------- -----
TESTUSER      SYS_EXPORT_SCHEMA_01  EXPORT    SCHEMA   COMPLETING 0

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SYS.SYS$SERVICE_METRICS_TAB Size Grows Big and Affects AQ Performance

SYMPTOMS

1)Table SYS.SYS$SERVICE_METRICS_TAB keeps growing everyday.

SQL> select count(*) from SYS$SERVICE_METRICS_TAB;

COUNT(*)
----------
46946104

SQL> SELECT TRUNC(enq_time), COUNT(*)
  FROM sys$service_metrics_tab
 GROUP BY TRUNC(enq_time)
 ORDER BY 1 ;

TRUNC(ENQ   COUNT(*)
--------- ----------
07-JAN-19      41052
08-JAN-19      63338
09-JAN-19      63096
10-JAN-19      63338
11-JAN-19      62128
12-JAN-19      63338
13-JAN-19      63316
14-JAN-19      63316
...
..
.

2) Oracle background process ora_cjq — Job scheduler coordinator slows and hangs when running below SQL with “enq: TQ – DDL contention” contention.

begin dbms_aqadm_sys.remove_subscriber (
                            queue_name => 'SYS.SYS$SERVICE_METRICS', 
                 subscriber => sys.aq$_agent(:1, NULL, NULL)); end;

3) Oracle background process Qnnn: Queue cleanup processes hang with “library cache pin” contention.

4) oraagent.bin@host program also has “library cache pin” contention”.

5) Manageability Monitor Process MMON background slave process ora_m000 has “library cache lock” contention.

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Database Logon Trigger to Block Sessions from Some Users using Toad,SQL Developer….

Here is an example of  database logon trigger for blocking specific users from accessing database through tools like  Toad or SQL Developer tools, etc.

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Any database users with “ADMINISTER DATABASE TRIGGER” will bypass the database logon trigger.

SQL> grant ADMINISTER DATABASE TRIGGER to testuser;

Grant succeeded.

SQL> connect testuser
Enter password:
Connected.

Schema Logon Trigger to Block Logon Sessions from Toad, SQL Developer, Sqlplus….

In production environment, sessions from developers using tools like Toad, SQL Developer, Sqlplus, etc can be blocked by after schema logon trigger.

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