Oracle Daily Monitoring statements

Oracle's common performance monitoring SQL statements

First, query the history of sql:

---The SQL statement being executed:
Select A.username, A.sid,b.sql_text, B.sql_fulltext
From V$session A, V$sqlarea b where a.sql_address = b.address;

---Query the SQL statement that Oracle is executing and the user who executes the statement:
SELECT b.sid Oracleid, b.username Log in to the Oracle user name, b.serial#,
SPID operating system ID, PADDR, sql_text executing SQL, b.machine computer name
From V$process A, v$session B, V$sqlarea c
WHERE a.addr = b.paddr and b.sql_hash_value = C.hash_value;

---to view the issuer's release program for executing SQL
SELECT osuser Computer login status, program initiated the request, USERNAME login system username,
SCHEMANAME, B.cpu_time spends Cpu time, STATUS, B.sql_text executed SQL
From V$session A left JOIN v$sql B on a.sql_address = b.address and A.sql_hash_value = B.hash_value
ORDER by B.cpu_time DESC;

---executed SQL statement:
Select B.sql_text,b.first_load_time,b.sql_fulltext
From V$sqlarea b where b.first_load_time between ' 2017-06-06/18:00:47 ' and ' 2017-06-06/20:00:47 '
Order BY B.first_load_time;

---Query the most recently executed SQL statement:
Select Sql_text,last_load_time from V$sql order by last_load_time Desc;
SELECT Sql_text, last_load_time from V$sql WHERE last_load_time are not NULL and sql_text like ' select% ' ORDER by last_load _time DESC;
SELECT Sql_text, last_load_time from V$sql WHERE last_load_time are not NULL and sql_text like ' update% ' ORDER by last_load _time DESC;
SELECT Sql_text, last_load_time from V$sql WHERE last_load_time are not NULL and last_load_time like ' 14-06-09% ' ORDER by L Ast_load_time DESC;

---Find the first 10 poor performance SQL statements:
SELECT * FROM (select Parsing_user_id,executions,sorts, Command_type,disk_reads,sql_text
From V$sqlarea ORDER by Disk_reads DESC) where rownum<10;

---View the running session with the larger IO:
SELECT SE.SID,SE.SERIAL#,PR. Spid,se.username,se.status,
Se.terminal,se.program,se. Module,se.sql_address,st.event,st.
P1text,si.physical_reads,
Si.block_changes from V$session Se,v$session_wait St,
V$sess_io si,v$process PR WHERE St.sid=se.sid and St.
Sid=si.sid and SE. Paddr=pr. ADDR and Se.sid>6 and St.
Wait_time=0 and st.event not like '%sql% ' ORDER by Physical_reads DESC;

--View the current number of session connections
Select COUNT (*) from v$session;
--View the details of the session
Select Sid,serial#,username,program,machine,status from V$session;

Lock table Query sql
SELECT object_name, Machine, S.sid, s.serial#
From Gv$locked_object L, dba_objects O, gv$session s
WHERE l.object_id = o.object_id
and l.session_id = S.sid;

--Release session SQL:
--alter system kill session ' Sid, Serial# ';
ALTER system kill session ' 23, 1647 ';

--Identify Oracle's current locked object
SELECT l.session_id Sid, S.serial#, L.locked_mode lock mode, l.oracle_username login user,
L.os_user_name Login Machine user name, S.machine machine name, s.terminal end user name, O.object_name locked object name, S.logon_time logon database time
From V$locked_object L, all_objects O, v$session s
WHERE l.object_id = o.object_id and l.session_id = S.sid
ORDER by Sid, S.serial#;

--kill drop the current lock object can be
Alter system kill session ' Sid, S.serial# ';

Second, daily performance monitoring statements:

1. Waiting for the monitoring case

Select Event,sum (Decode (wait_time,0,0,1)) "Prev",
SUM (decode (wait_time,0,1,0)) "Curr", COUNT (*) "Tot"
From v$session_wait
Group BY event order by 4;

2. Race Conditions for rollback segments

Select name, waits, gets, waits/gets "Ratio"
From V$rollstat A, v$rollname b
where A.usn = B.usn;

3. Monitoring the I/O ratio of table spaces

Select Df.tablespace_name name,df.file_name "file", F.phyrds Pyr,
F.phyblkrd pbr,f.phywrts pyw, F.phyblkwrt PBW
From V$filestat F, Dba_data_files DF
where f.file# = df.file_id
Order BY Df.tablespace_name;

4. Monitor the I/O ratio of the file system

Select substr (a.file#,1,2) "#", substr (a.name,1,30) "Name",
A.status, A.bytes, B.phyrds, B.phywrts
From V$datafile A, V$filestat b
where a.file# = b.file#;

5. Find all the indexes under one user

Select User_indexes.table_name, User_indexes.index_name,uniqueness, column_name
From User_ind_columns, user_indexes
where user_ind_columns.index_name = User_indexes.index_name
and user_ind_columns.table_name = User_indexes.table_name
Order by User_indexes.table_type, User_indexes.table_name,
User_indexes.index_name, column_position;

6. Monitor the ratio of the SGA

Select A.value + b.value "logical_reads", C.value "Phys_reads",
Round ((a.value+b.value)-c.value)/(A.value+b.value)) "BUFFER hit RATIO"
From V$sysstat A, V$sysstat B, V$sysstat c
where a.statistic# = b.statistic# = 39
and c.statistic# = 40;

7. Monitor the dictionary buffer hit ratio in the SGA

Select parameter, gets,getmisses, getmisses/(gets+getmisses) *100 "Miss Ratio",
(SUM (getmisses)/(SUM (gets) +sum (getmisses))) *100 "hit ratio"
From V$rowcache
where Gets+getmisses <>0
Group BY parameter, gets, getmisses;

8. Monitor the hit rate of shared buffers in the SGA, which should be less than 1%

Select SUM (Pins) "Total pins", sum (reloads) "Total reloads",
SUM (reloads)/sum (pins) *100 Libcache
From V$librarycache;

Select SUM (pinhits-reloads)/sum (Pins) "Hit Radio", SUM (reloads)/sum (Pins) "Reload percent"
From V$librarycache;

9. Display the category and size of all database objects

Select count (name) num_instances, type, sum (source_size) source_size,
SUM (parsed_size) parsed_size, sum (code_size) code_size, sum (error_size) error_size,
SUM (source_size) +sum (parsed_size) +sum (code_size) +sum (error_size) size_required
From Dba_object_size
Group By type Order by 2;

10. Monitor the hit rate of redo log buffers in SGA, should be less than 1%

SELECT name, gets, misses, immediate_gets, immediate_misses,
Decode (gets,0,0,misses/gets*100) Ratio1,
Decode (immediate_gets+immediate_misses,0,0,
Immediate_misses/(immediate_gets+immediate_misses) *100) Ratio2
From V$latch WHERE name in (' Redo allocation ', ' redo copy ');

11. Monitor the memory and hard disk sequencing ratios, preferably less than. 10, increase sort_area_size

SELECT name, value from V$sysstat WHERE name in (' Sorts (memory) ', ' sorts (disk) ');

12. Monitor the current database who is running what SQL statement

SELECT Osuser, username, sql_text from v$session A, V$sqltext b
where a.sql_address =b.address order by address, piece;

13. Monitoring the dictionary buffers

Select (sum (pins-reloads))/sum (PINS) "LIB CACHE" from V$librarycache;
Select (sum (gets-getmisses-usage-fixed))/sum (GETS) "ROW CACHE" from V$rowcache;
Select SUM (PINS) "Executions", sum (reloads) "CACHE MISSES while executing" from V$librarycache;

The latter divided by the former, this ratio is less than 1%, close to 0% is good.

Select sum (gets) "DICTIONARY GETS", Sum (getmisses) "DICTIONARY CACHE GET MISSES"
From V$rowcache

14. Find the Oracle Character set

SELECT * from sys.props$ where name= ' nls_characterset ';

15. Monitoring MTS

Select busy/(Busy+idle) "Shared servers Busy" from V$dispatcher;

When this value is greater than 0.5, the parameters need to be increased

Select sum (Wait)/sum (TOTALQ) "Dispatcher waits" from V$queue where type= ' dispatcher ';
Select COUNT (*) from V$dispatcher;
Select Servers_highwater from V$mts;

Servers_highwater when approaching mts_max_servers, the parameters need to be increased

16. Fragmentation Level

Select Tablespace_name,count (tablespace_name) from Dba_free_space GROUP by Tablespace_name
Having count (Tablespace_name) >10;

Alter tablespace name COALESCE;
ALTER TABLE name DEALLOCATE unused;

Create or replace view Ts_blocks_v as
Select Tablespace_name,block_id,bytes,blocks, ' free space ' segment_name from Dba_free_space
UNION ALL
Select Tablespace_name,block_id,bytes,blocks,segment_name from Dba_extents;

SELECT * from Ts_blocks_v;

Select Tablespace_name,sum (bytes), max (bytes), COUNT (block_id) from Dba_free_space
Group BY Tablespace_name;

View a table with a high degree of fragmentation

SELECT segment_name table_name, COUNT (*) extents
From Dba_segments WHERE owner isn't in (' SYS ', ' SYSTEM ') GROUP by segment_name
Have COUNT (*) = (SELECT MAX (COUNT (*)) from dba_segments GROUP by segment_name);

17. Checking the storage of tables and indexes

Select Segment_name,sum (bytes) space,count (*) Ext_quan from dba_extents where
Tablespace_name= ' &tablespace_name ' and segment_type= ' TABLE ' GROUP by Tablespace_name,segment_name;

Select Segment_name,count (*) from dba_extents where segment_type= ' INDEX ' and owner= ' &owner '
Group BY Segment_name;

18. Monitor User

SELECT DISTINCT
P.spid unix_process,
S.terminal,
To_char (S.logon_time, ' yyyy/mon/dd hh24:mi ') Logon_time,
S.username
From V$process p, v$session s
where P.addr=s.paddr ORDER by 2

19. Generate reports for Tablespace usage status

Select T.tablespace_name tb_name, d.tot_size/1024/1024 tot,
(d.tot_size-f.free_size)/1024/1024 used,
free_size/1024/1024 free,
f.max_free_extent/1024/1024 Max_free_extent,
n.max_next_extent/1024/1024 Max_next_extent,
Round (free_size/tot_size * 100,0) pct
From Dba_tablespaces T,
(select Tablespace_name, sum (bytes) tot_size from Dba_data_files
where status = ' AVAILABLE '
Group by Tablespace_name) d,
(select Tablespace_name, sum (bytes) free_size, max (bytes) max_free_extent
From Dba_free_space
GROUP by Tablespace_name) F,
(Select Tablespace_name, max (next_extent) max_next_extent--assume pcs_increase=0
From Dba_segments
Group by Tablespace_name) n
where t.tablespace_name = D.tablespace_name
and d.tablespace_name = F.tablespace_name
and f.tablespace_name = N.tablespace_name
and status = ' ONLINE '
--and d.tablespace_name like Upper (' 1% ')
ORDER BY 7,1

Third, CPU and memory usage monitoring statement:

1. Check the machine performance top isolate several PID numbers that occupy memory or CPU. Then use the Sys/oracle login database to view: "Check the SQL-related information that consumes the most memory SGA"
Check Memory:
Select Server, Osuser, Name, value/1024/1024 Mb, s.sql_id, Spid, s.*
From V$session S, V$sesstat St, V$statname Sn, v$process p
Where St.sid = S.sid
and st.statistic# = sn.statistic#
and Sn.name like ' session PGA memory '
and p.addr = S.paddr
---The following spid is the PID number on the server, if you do not add the following and conditions, find out all.
and p.spid= ' 18988 '
Order by Value Desc;

Check the CPU:
Select P.pid pid,s.sid sid,p.spid spid,s.username username,s.osuser osname,p.serial# s_#,p.terminal,p.program program,
P.background,s.status,rtrim (substr (a.sql_text,1,80)) SQL from V$process p,v$session S,v$sqlarea a where
P.addr=s.paddr and s.sql_address=a.address (+)
and p.spid like ' 3148 ';

2. View the top 10 CPU-intensive sql:
SELECT * FROM (select Sql_text,sql_id,cpu_time to V$sql ORDER by cpu_time Desc) where rownum<=10 ORDER by rownum ASC ;
SELECT * FROM (select Sql_text,sql_id,cpu_time to V$sqlarea ORDER by cpu_time Desc) where rownum<=10 order by rownum ASC;
These 2 statements effect basically the same, one from the V$sql view query from the V$sqlarea view.

3. List the 5 most frequently used queries:
Select Sql_text,executions
From (select Sql_text,executions,
Rank () over
(Order BY executions Desc) Exec_rank
From V$sql)
where Exec_rank <=5;

4. The SQL TOP5 that consumes the most disk reads:
Select Disk_reads,sql_text
From (select Sql_text,disk_reads,
Dense_rank () over
(Order BY disk_reads Desc) Disk_reads_rank
From V$sql)
where Disk_reads_rank <=5;

5. Find the query that requires a large buffer read (logical read) operation:
Select Buffer_gets,sql_text
From (select Sql_text,buffer_gets,
Dense_rank () over
(Order BY buffer_gets Desc) Buffer_gets_rank
From V$sql)
where buffer_gets_rank<=5;

Oracle Daily Monitoring statements