Differences

This shows you the differences between the selected revision and the current version of the page.

wiki:sysmaster 2010/04/19 19:10 wiki:sysmaster 2014/04/30 20:59 current
Line 5: Line 5:
The window into the entire system, an area of shared memory with an SQL like interface The window into the entire system, an area of shared memory with an SQL like interface
 +
 +=====  How to drop sysmaster =====
 +
 +
 +  dbaccess sysmaster -
 + 
 +  delete from systables where tabid > 99 and partnum < '0x100000'; 
 + 
 +  delete from systables where tabname = 'sysdbspartn';
 + 
 +  close database;
 + 
 +  drop database sysmaster;
=====  How long has the user been connected ===== =====  How long has the user been connected =====
Line 45: Line 58:
            where systabnames.partnum = sysptntab.partnum             where systabnames.partnum = sysptntab.partnum
                       
 +
=====  How long has the database engine been running ===== =====  How long has the database engine been running =====
       
-            select dbinfo('UTC_TO_DATETIME', sh_curtime) +            select dbinfo('UTC_TO_DATETIME', sh_curtime) - dbinfo('UTC_TO_DATETIME', sh_boottime)
-            - dbinfo('UTC_TO_DATETIME', sh_boottime)+
            from sysshmvals             from sysshmvals
                       
Line 75: Line 88:
            and syschunks.dbsnum = sysdbspaces.dbsnum             and syschunks.dbsnum = sysdbspaces.dbsnum
                       
 +
 +
 +
=====  What is the current version of the engine ===== =====  What is the current version of the engine =====
    select owner     select owner
-            from sysmaster:systables .+            from sysmaster:systables
            where tabid = 99             where tabid = 99
                       
 +
 +Works fine on the earlier engines, not so good on the later ones as the Official Release doesn't tally back  i.e. 10.00.FC6 reports 9.50C1, and 11.50.FC6 reports 9.53C1 etc. However,
 +
 +  DBINFO('version','server-type')
 +  DBINFO('version','major')
 +  DBINFO('version','minor')
 +  DBINFO('version','os')
 +  DBINFO('version','full')
 +
 +All should work
 +
 +
=====  How to list the users ===== =====  How to list the users =====
    select unique username     select unique username
Line 271: Line 299:
            group by 1             group by 1
                       
 +
Line 292: Line 321:
            or sqx_executions > 1)             or sqx_executions > 1)
            and sqx_bufreads / sqx_executions > 50000             and sqx_bufreads / sqx_executions > 50000
 +
 +The following SQL identifies the unused indexes
 +
 +  SELECT
 +    x1.dbsname,
 +    x3.tabname,
 +    x1.tabname AS idxname,
 +    (x4.npused * x4.pagesize / 1024) :: INT AS size_kb
 +  FROM
 +    systabnames AS x1, sysptntab AS x2,
 +    systabnames AS x3, sysptnhdr AS x4
 +  WHERE x2.partnum = x1.partnum
 +    AND x2.partnum != x2.tablock
 +    AND x3.partnum = x2.tablock
 +    AND x4.partnum = x1.partnum
 +    AND x1.dbsname MATCHES '[a-z]*'
 +    AND x3.tabname MATCHES '[a-z]*'
 +    AND x2.pf_isread = 0
 +    AND x2.pf_iswrite > 0
 +  ORDER BY 4 DESC
 +
In the later engines, or databases with detached indices this information is also available via Table IO stats but the indexname as the table filter In the later engines, or databases with detached indices this information is also available via Table IO stats but the indexname as the table filter
Line 733: Line 783:
  6 Online   6 Online
  7 Abort   7 Abort
 +
=====  What type of instance is running ===== =====  What type of instance is running =====
Line 745: Line 796:
  3 SD secondary server   3 SD secondary server
  4 RS secondary server   4 RS secondary server
 +
 +
 +
 +
 +
 +===== What dbspaces are being used by a database =====
 +
 +  select distinct dbinfo("dbspace",b.partnum)
 +    from <database>:sysfragments a, sysmaster:systabnames b
 +    where a.partn = b.partnum
 +      and tabid > 99
 +  union
 +  select distinct dbinfo("dbspace",b.partnum)
 +    from <database>:systables a, sysmaster:systabnames b
 +    where a.partnum = b.partnum
 +      and a.partnum != 0
 +      and tabid > 99
 +  union
 +  select b.name dbs_name
 +    from sysmaster:systabnames a, sysmaster:sysdbspaces b, <database>:sysindexes c
 +    where b.dbsnum = trunc(a.partnum/1048576)
 +      and c.idxname = a.tabname
 +      and a.dbsname = '<database>'
 +      and tabid > 99
 +  order by 1
 +
 +===== What are the unused indexes =====
 +
 +  select sysindexes.idxname index, sysindexes.idxtype as type, sysptprof.isreads reads
 +    from sysindexes, sysmaster:sysptprof sysptprof
 +    where sysindexes.idxname = sysptprof.tabname
 +      and sysptprof.isreads = 0
 +    order by reads desc, idxname ;
 +

Personal Tools