sql history - ORACLEAGENT BLOG

Get database uptime

select to_char(startup_time, ‘DD-MM-YYYY HH24:MI:SS’),floor(sysdate-startup_time) DAYS from v$Instance;

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Scn to Timestamp and Timestamp to Scn

— Get current scn value:
select current_scn from v$database;
— Get scn value at particular time:
select timestamp_to_scn(’26-FEB-21:05:10:00′) from dual;
— Get timestamp from scn:
select scn_to_timestamp(298411441)from dual;

Get Database incarnation information in database

set heading off
set feedback off
select ‘Incarnation Destination Configuration’ from dual;
select ‘*************************************’ from dual;
set heading on
set feedback on

select INCARNATION# INC#, RESETLOGS_CHANGE# RS_CHANGE#, RESETLOGS_TIME,
PRIOR_RESETLOGS_CHANGE# PRIOR_RS_CHANGE#, STATUS,
FLASHBACK_DATABASE_ALLOWED FB_OK from v$database_incarnation;

How to get CPU memory info in server

set pagesize 200
set lines 200
col name for a21
col stat_name for a25
col value for a13
col comments for a56
select STAT_NAME,to_char(VALUE) as VALUE ,COMMENTS from v$osstat where
stat_name IN (‘NUM_CPUS’,’NUM_CPU_CORES’,’NUM_CPU_SOCKETS’)
union
select STAT_NAME,VALUE/1024/1024/1024 || ‘ GB’ ,COMMENTS from
v$osstat where stat_name IN (‘PHYSICAL_MEMORY_BYTES’);

Get redo log member info

col member for a56
set pagesize 299
set lines 299

select l.group#, l.thread#,
f.member,
l.archived,
l.status,
(bytes/1024/1024) “Size (MB)”
from
v$log l, v$logfile f
where f.group# = l.group#
order by 1,2
/

Get DDL of all tablespaces

set heading off;
set echo off;
Set pages 999;
set long 90000;
spool ddl_tablespace.sql

select dbms_metadata.get_ddl(‘TABLESPACE’,tb.tablespace_name) from dba_tablespaces tb;
spool off

How to purge AWR old snapshot details in database

— Find the AWR snapshot details.
select snap_id,begin_interval_time,end_interval_time from sys.wrm$_snapshot order by snap_id

— Purge snapshot between snapid 439 to 800
execute dbms_workload_repository.drop_snapshot_range(low_snap_id =>439 , high_snap_id =>800);

— Verify again
select snap_id,begin_interval_time,end_interval_time from sys.wrm$_snapshot order by snap_id’

How to purge AWR old snapshot details in database

— Find the AWR snapshot details.
select snap_id,begin_interval_time,end_interval_time from sys.wrm$_snapshot order by snap_id

— Purge snapshot between snapid 439 to 800
execute dbms_workload_repository.drop_snapshot_range(low_snap_id =>439 , high_snap_id =>800);

— Verify again
select snap_id,begin_interval_time,end_interval_time from sys.wrm$_snapshot order by snap_id’

Generate Bulk AWR reports in database

select SNAP_ID, BEGIN_INTERVAL_TIME, END_INTERVAL_TIME
from dba_hist_snapshot
where trunc(BEGIN_INTERVAL_TIME)=trunc(sysdate-&no)
order by 1;

CREATE OR REPLACE DIRECTORY awr_reports_dir AS ‘/tmp/awrreports’;

DECLARE
— Adjust before use.
l_snap_start NUMBER := 4884; –Specify Initial Snap ID
l_snap_end NUMBER := 4892; –Specify End Snap ID
l_dir VARCHAR2(50) := ‘AWR_REPORTS_DIR’;

l_last_snap NUMBER := NULL;
l_dbid v$database.dbid%TYPE;
l_instance_number v$instance.instance_number%TYPE;
l_file UTL_FILE.file_type;
l_file_name VARCHAR(50);

BEGIN
SELECT dbid
INTO l_dbid
FROM v$database;

SELECT instance_number
INTO l_instance_number
FROM v$instance;

FOR cur_snap IN (SELECT snap_id
FROM dba_hist_snapshot
WHERE instance_number = l_instance_number
AND snap_id BETWEEN l_snap_start AND l_snap_end
ORDER BY snap_id)
LOOP
IF l_last_snap IS NOT NULL THEN
l_file := UTL_FILE.fopen(l_dir, ‘awr_’ || l_last_snap || ‘_’ || cur_snap.snap_id || ‘.html’, ‘w’, 32767);

FOR cur_rep IN (SELECT output
FROM TABLE(DBMS_WORKLOAD_REPOSITORY.awr_report_html(l_dbid, l_instance_number, l_last_snap, cur_snap.snap_id)))
LOOP
UTL_FILE.put_line(l_file, cur_rep.output);
END LOOP;
UTL_FILE.fclose(l_file);
END IF;
l_last_snap := cur_snap.snap_id;
END LOOP;

EXCEPTION
WHEN OTHERS THEN
IF UTL_FILE.is_open(l_file) THEN
UTL_FILE.fclose(l_file);

How to find current redo log size in database

SELECT le.leseq “Current log sequence No”,
100*cp.cpodr_bno/le.lesiz “Percent Full”,
cp.cpodr_bno “Current Block No”,
le.lesiz “Size of Log in Blocks”
FROM x$kcccp cp, x$kccle le
WHERE le.leseq =CP.cpodr_seq
AND bitand(le.leflg,24) = 8
/

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