DBMS_STATS.GET_SYSTEM_STATS : dbms_stats « System Packages « Oracle PL / SQL






  1. Oracle PL / SQL
  2. System Packages
  3. dbms_stats

DBMS_STATS.GET_SYSTEM_STATS

    

SQL>
SQL> SET SERVEROUTPUT ON
SQL> DECLARE
  2   STATUS VARCHAR2(20);
  3   DSTART DATE;
  4   DSTOP DATE;
  5   PVALUE NUMBER;
  6   PNAME VARCHAR2(30);
  7  BEGIN
  8   PNAME := 'sreadtim';
  9   DBMS_STATS.GET_SYSTEM_STATS(status, dstart, dstop, pname, pvalue);
 10   DBMS_OUTPUT.PUT_LINE('single block readtime in ms : '||pvalue);
 11  END;
 12  /
single block readtime in ms :

PL/SQL procedure successfully completed.

SQL>








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1.dbms_stats.drop_stat_table, dbms_stats.create_stat_table,dbms_stats.delete_system_stats
2.dbms_stats.gather_schema_stats
3.dbms_stats.gather_table_stats
4.dbms_stats.import_system_stats
5.dbms_stats.objectTab
6.dbms_stats.set_table_stats( user, 'EMP', numrows => 100000 )
7.dbms_stats.set_table_stats( user, 'myTable1', numrows => 10000000, numblks => 1000000 )
8.Delete all table and index statistics in your schema:
9.multiblock readtime in ms
10.Run DBMS_STATS.GATHER_SCHEMA_STATS to collect stats for all of your tables and indexes.
11.Extract system stats from your user table or data dictionary (sys.aux_Stats$).