Oracle DBA Daily Checklist

谁践踏了优雅 2023-10-05 14:55 117阅读 0赞

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There are several routine checklist and tasks to do in Oracle database by DBA ( Database Administrator ). This checklist and tasks are as follows.

All scripts are valid for Single and RAC Database and Exadata.

If you don’t use RAC, then you can ignore scripts for other Nodes and SCAN Listener etc..

**1- Oracle instance(s) are running or not.**

Use the following script to check Oracle Instance Processes

If RAC is used, then check all Instances of database.

Linux:

Check SMON or PMON process

[oracle@msddbadm01 ~]$ ps -ef | grep smon
    
    or
    
    [oracle@msddbadm01 ~]$ ps -ef | grep pmon
    
    
    
    Check all Instance of any database as follows.
    [oracle@msddbadm01 ~]$ srvctl status database -d <DB_NAME>
    
    
    
    
    [oracle@msddbadm01 ~]$ ps -ef | grep smon
    oracle 140550 1 0 2019 ? 00:01:49 asm_smon_+ASM1
    root 147726 1 1 2019 ? 1-04:06:08 /u01/app/12.1.0.2/grid/bin/osysmond.bin
    oracle 156342 1 0 2019 ? 00:13:57 ora_smon_msd1
    oracle 248609 246524 0 12:02 pts/0 00:00:00 grep smon
    [oracle@msddbadm01 ~]$
    
    [oracle@msddbadm01 ~]$ srvctl status database -d msd
    Instance msd1 is running on node msddbadm01
    Instance msd2 is running on node msddbadm02
    [oracle@msddbadm01 ~]$

**2- Local ( and SCAN ) listeners are running or not.**

Use the following script to check Listeners

[oracle@msddbadm01 ~]$ lsnrctl status
    
    [oracle@msddbadm01 ~]$ srvctl status scan_listener

[oracle@msddbadm01 ~]$ lsnrctl status
    
    LSNRCTL for Linux: Version 18.0.0.0.0 - Production on 10-MAR-2020 14:42:31
    
    Copyright (c) 1991, 2019, Oracle.  All rights reserved.
    
    Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
    STATUS of the LISTENER
    ------------------------
    Alias                     LISTENER
    Version                   TNSLSNR for Linux: Version 18.0.0.0.0 - Production
    Start Date                04-JAN-2020 17:36:35
    Uptime                    65 days 21 hr. 5 min. 55 sec
    Trace Level               off
    Security                  ON: Local OS Authentication
    SNMP                      OFF
    Listener Parameter File   /u01/grid/network/admin/listener.ora
    Listener Log File         /u01/app/grid/diag/tnslsnr/msdidb01/listener/alert/log.xml
    Listening Endpoints Summary...
      (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
      (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.63.34)(PORT=1521)))
    Services Summary...
    Service "+APX" has 1 instance(s).
      Instance "+APX1", status READY, has 1 handler(s) for this service...
    Service "+ASM" has 1 instance(s).
      Instance "+ASM1", status READY, has 1 handler(s) for this service...
    Service "+ASM_DATA" has 1 instance(s).
      Instance "+ASM1", status READY, has 1 handler(s) for this service...
    Service "+ASM_RECO" has 1 instance(s).
      Instance "+ASM1", status READY, has 1 handler(s) for this service...
    Service "MSDB" has 1 instance(s).
      Instance "MSDB1", status READY, has 1 handler(s) for this service...
    Service "MSDBXDB" has 1 instance(s).
      Instance "MSDB1", status READY, has 1 handler(s) for this service...
    Service "SYS$GGS_ADMIN.OGGQ$RCCB01.MSDB" has 1 instance(s).
      Instance "MSDB1", status READY, has 1 handler(s) for this service...
    Service "SYS$GGS_ADMIN.OGGQ$RCCB02.MSDB" has 1 instance(s).
      Instance "MSDB1", status READY, has 1 handler(s) for this service...
    The command completed successfully
    [oracle@msddbadm01 ~]$ 
    [oracle@msddbadm01 ~]$ 
    
    [oracle@msddbadm01 ~]$ 
    [oracle@msddbadm01 ~]$ srvctl status scan_listener
    SCAN Listener LISTENER_SCAN1 is enabled
    SCAN listener LISTENER_SCAN1 is running on node msdidb03
    SCAN Listener LISTENER_SCAN2 is enabled
    SCAN listener LISTENER_SCAN2 is running on node msdidb01
    SCAN Listener LISTENER_SCAN3 is enabled
    SCAN listener LISTENER_SCAN3 is running on node msdidb06
    [oracle@msddbadm01 ~]$

**3- Check the Server Storage or Disk of Oracle database .**

Check if ASM and File system disks size are enough or not.

Use the following script to check Filesystem disks.

Check Filesystem disks.

[oracle@msddbadm01 ~]$ df -h
    
    Unix
    
    [oracle@msddbadm01 ~]$ df -g
    
    
    
    [oracle@msddbadm01 ~]$ df -h
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/mapper/VGExaDb-LVDbSys1
                           30G   25G  3.8G  87% /
    tmpfs                 755G  6.5G  749G   1% /dev/shm
    /dev/sda1             488M   28M  425M   7% /boot
    /dev/mapper/VGExaDb-LVDbOra1
                          197G  109G   79G  59% /u01
    /dev/sda2             254M   24M  231M  10% /boot/efi
    /dev/mapper/VGExaDb-openvlv
                           15G   38M   14G   1% /usr/openv
    /dev/asm/acfs_vol1-371
                          9.8T  4.8T  5.0T  49% /goldengate
    [oracle@msddbadm01 ~]$

Check Oracle ASM diskgroups.

Use the following script to check Diskgroup size.

[grid@msdidb01 ~]$ asmcmd lsdg

[grid@msdidb01 ~]$ asmcmd
    ASMCMD> lsdg
    State    Type  Rebal  Sector  Logical_Sector  Block       AU    Total_MB    Free_MB  Req_mir_free_MB  Usable_file_MB  Offline_disks  Voting_files  Name
    MOUNTED  HIGH  Y         512             512   4096  4194304  1056964608  214081832         14680064        66467256              2             Y  DATA/
    MOUNTED  HIGH  N         512             512   4096  4194304   134507520  101014692          1868160        33048844              0             N  RECO/
    ASMCMD>

**4- Check the Tablespaces for objects to extend if required.**

Use the following script to check Tablespace usage

set pagesize 1000 linesize 180
    tti 'Tablespace Usage Status'
    col "TOTAL(MB)" for 99,999,999.999
    col "USAGE(MB)" for 99,999,999.999
    col "FREE(MB)" for 99,999,999.999 
    col "EXTENSIBLE(MB)" for 99,999,999.999 
    col "FREE PCT %" for 999.99
    col "USED PCT OF MAX %" for 999.99
    col "NOTO" for 9999
    col "OTO" for 999
    select d.tablespace_name "NAME", 
    d.contents "TYPE",
    nvl(a.bytes /1024/1024,0) "TOTAL(MB)",
    nvl(a.bytes - nvl(f.bytes,0),0)/1024/1024 "USAGE(MB)",
    nvl(f.bytes,0)/1024/1024 "FREE(MB)",
    nvl((a.bytes - nvl(f.bytes,0))/a.bytes * 100,0) "FREE PCT %",
    nvl(a.ARTACAK,0)/1024/1024 "EXTENSIBLE(MB)",
    nvl((a.bytes - nvl(f.bytes,0))/ (a.bytes + nvl(a.ARTACAK,0)) * 100,0) "USED PCT OF MAX %",
    a.NOTO, a.OTO
    from sys.dba_tablespaces d,
    (select tablespace_name, sum(bytes) bytes,
    sum(decode(autoextensible,'YES',MAXbytes - bytes,0 )) ARTACAK,
    count(decode(autoextensible,'NO',0)) NOTO,
    count(decode(autoextensible,'YES',0)) OTO
    from dba_data_files
    group by tablespace_name) a,
    (select tablespace_name, sum(bytes) bytes
    from dba_free_space
    group by tablespace_name) f
    where d.tablespace_name = a.tablespace_name(+)
    and d.tablespace_name = f.tablespace_name(+)
    and NOT (d.extent_management like 'LOCAL'and d.contents like 'TEMPORARY')
    UNION ALL
    select d.tablespace_name "NAME",
    d.contents "TYPE",
    nvl(a.bytes /1024/1024,0) "TOTAL(MB)",
    nvl(t.bytes,0)/1024/1024 "USAGE(MB)",
    nvl(a.bytes - nvl(t.bytes,0),0)/1024/1024 "FREE(MB)",
    nvl(t.bytes/a.bytes * 100,0) "FREE PCT %",
    nvl(a.ARTACAK,0)/1024/1024 "EXTENSIBLE(MB)",
    nvl(t.bytes/(a.bytes + nvl(a.ARTACAK,0)) * 100,0) "USED PCT OF MAX %", a.NOTO, a.OTO
    from sys.dba_tablespaces d,
    (select tablespace_name, sum(bytes) bytes,
    sum(decode(autoextensible,'YES',MAXbytes - bytes,0 )) ARTACAK,
    count(decode(autoextensible,'NO',0)) NOTO,
    count(decode(autoextensible,'YES',0)) OTO
    from dba_temp_files
    group by tablespace_name) a,
    (select tablespace_name, sum(bytes_used) bytes 
    from v$temp_extent_pool
    group by tablespace_name) t
    where d.tablespace_name = a.tablespace_name(+)
    and d.tablespace_name = t.tablespace_name(+)
    and d.extent_management like 'LOCAL'
    and d.contents like 'TEMPORARY%'
    order by 3 desc;
    exit;

Result of script is as follows.

SQL> set pagesize 1000 linesize 180
    SQL> tti 'Tablespace Usage Status'
    SQL> col "TOTAL(MB)" for 99,999,999.999
    SQL> col "USAGE(MB)" for 99,999,999.999
    SQL> col "FREE(MB)" for 99,999,999.999 
    SQL> col "EXTENSIBLE(MB)" for 99,999,999.999 
    SQL> col "FREE PCT %" for 999.99
    SQL> col "USED PCT OF MAX %" for 999.99
    SQL> col "NOTO" for 9999
    SQL> col "OTO" for 999
    SQL> select d.tablespace_name "NAME", 
    2 d.contents "TYPE",
    3 nvl(a.bytes /1024/1024,0) "TOTAL(MB)",
    4 nvl(a.bytes - nvl(f.bytes,0),0)/1024/1024 "USAGE(MB)",
    5 nvl(f.bytes,0)/1024/1024 "FREE(MB)",
    6 nvl((a.bytes - nvl(f.bytes,0))/a.bytes * 100,0) "FREE PCT %",
    7 nvl(a.ARTACAK,0)/1024/1024 "EXTENSIBLE(MB)",
    8 nvl((a.bytes - nvl(f.bytes,0))/ (a.bytes + nvl(a.ARTACAK,0)) * 100,0) "USED PCT OF MAX %",
    9 a.NOTO, a.OTO
    10 from sys.dba_tablespaces d,
    11 (select tablespace_name, sum(bytes) bytes,
    12 sum(decode(autoextensible,'YES',MAXbytes - bytes,0 )) ARTACAK,
    13 count(decode(autoextensible,'NO',0)) NOTO,
    14 count(decode(autoextensible,'YES',0)) OTO
    15 from dba_data_files
    16 group by tablespace_name) a,
    17 (select tablespace_name, sum(bytes) bytes
    18 from dba_free_space
    19 group by tablespace_name) f
    20 where d.tablespace_name = a.tablespace_name(+)
    21 and d.tablespace_name = f.tablespace_name(+)
    22 and NOT (d.extent_management like 'LOCAL'and d.contents like 'TEMPORARY')
    23 UNION ALL
    24 select d.tablespace_name "NAME",
    25 d.contents "TYPE",
    26 nvl(a.bytes /1024/1024,0) "TOTAL(MB)",
    27 nvl(t.bytes,0)/1024/1024 "USAGE(MB)",
    28 nvl(a.bytes - nvl(t.bytes,0),0)/1024/1024 "FREE(MB)",
    29 nvl(t.bytes/a.bytes * 100,0) "FREE PCT %",
    30 nvl(a.ARTACAK,0)/1024/1024 "EXTENSIBLE(MB)",
    31 nvl(t.bytes/(a.bytes + nvl(a.ARTACAK,0)) * 100,0) "USED PCT OF MAX %", a.NOTO, a.OTO
    32 from sys.dba_tablespaces d,
    33 (select tablespace_name, sum(bytes) bytes,
    34 sum(decode(autoextensible,'YES',MAXbytes - bytes,0 )) ARTACAK,
    35 count(decode(autoextensible,'NO',0)) NOTO,
    36 count(decode(autoextensible,'YES',0)) OTO
    37 from dba_temp_files
    38 group by tablespace_name) a,
    39 (select tablespace_name, sum(bytes_used) bytes 
    40 from v$temp_extent_pool
    41 group by tablespace_name) t
    42 where d.tablespace_name = a.tablespace_name(+)
    43 and d.tablespace_name = t.tablespace_name(+)
    44 and d.extent_management like 'LOCAL'
    45 and d.contents like 'TEMPORARY%'
    46 order by 3 desc;
    exit;
    
    
    Tue Mar 10 page 1

Tablespace Usage Status
    
    NAME                           TYPE                        TOTAL(MB)       USAGE(MB)        FREE(MB) FREE PCT %  EXTENSIBLE(MB) USED PCT OF MAX %  NOTO  OTO
    ------------------------------ --------------------- --------------- --------------- --------------- ---------- --------------- ----------------- ----- ----
    USERS                          PERMANENT                 625,384.391     621,953.953       3,430.438      99.45      83,223.281             87.77     1   21
    MSD_TBS                        PERMANENT                 550,324.313     277,077.188     273,247.125      50.35  33,004,107.664               .83     0    1
    DEFAULT_TBS1                   PERMANENT                 410,624.000       4,623.438     406,000.563       1.13  31,046,656.000               .01     0    1
    TEMP                           TEMPORARY                 393,214.828           7.000     393,207.828        .00            .984               .00     0   12
    DEFAULTTBS                     PERMANENT                 278,171.938      98,217.375     179,954.563      35.31  33,276,260.039               .29     0    1
    UNDOTBS1                       UNDO                       22,180.000         314.063      21,865.938       1.42     141,659.922               .19     0    5
    SYSAUX                         PERMANENT                  13,670.000      12,562.313       1,107.688      91.90      19,097.984             38.34     0    1
    SYSTEM                         PERMANENT                   7,880.000       7,113.375         766.625      90.27      57,655.969             10.85     0    2
    
    8 rows selected.
    
    SQL>

**5- Check the Recovery Size Area**

Use the following script to check Recovery Size Area

set pagesize 1000 line 200
    col "db_recovery_file_dest" for a32;
    col size_m for 999,999,999;
    col used_m for 999,999,999;
    col pct_used for 999;
    select name "db_recovery_file_dest",ceil(space_limit/1024/1024) TOTAL_MB, ceil( space_used /1024/1024) USED_MB,
    decode( nvl(space_used, 0),0,0,ceil(( space_used /space_limit) * 100)) PERCENTAGE(%)
    from v$recovery_file_dest
    order by 1;
    exit;

SQL> set pagesize 1000 line 200
    SQL> col "db_recovery_file_dest" for a32;
    SQL> col size_m   for 999,999,999;
    SQL> col used_m   for 999,999,999;
    SQL> col pct_used for 999;
    SQL> select name "db_recovery_file_dest",ceil(space_limit/1024/1024) TOTAL_MB, ceil( space_used /1024/1024) USED_MB,
      2  decode( nvl(space_used, 0),0,0,ceil(( space_used /space_limit) * 100)) PERCENTAGE
      3  from v$recovery_file_dest
      4  order by 1;
    exit;
    db_recovery_file_dest              TOTAL_MB     USED_MB      PERCENTAGE(%)
    -------------------------------- ---------- ---------- ----------
    +DATAC1                            2048000         79          1
    
    SQL>

SQL>

**6-Check the alert log if a vital error exists or not ( Corruption )**

Use the following script to check alertlog

set linesize 150
    set pagesize 150
    
    
    SELECT SUBSTR (MESSAGE_TEXT, 1, 300) MESSAGE_TEXT, COUNT (*) cnt
    FROM X$DBGALERTEXT
    WHERE (MESSAGE_TEXT LIKE '%ORA-%' OR UPPER (MESSAGE_TEXT) LIKE '%ERROR%')
    AND CAST (ORIGINATING_TIMESTAMP AS DATE) > SYSDATE - 1 
    GROUP BY SUBSTR (MESSAGE_TEXT, 1, 300);
    
    exit

SQL> SELECT SUBSTR (MESSAGE_TEXT, 1, 300) MESSAGE_TEXT, COUNT (*) cnt
    2 FROM X$DBGALERTEXT
    3 WHERE (MESSAGE_TEXT LIKE '%ORA-%' OR UPPER (MESSAGE_TEXT) LIKE '%ERROR%')
    4 AND CAST (ORIGINATING_TIMESTAMP AS DATE) > SYSDATE - 1 
    5 GROUP BY SUBSTR (MESSAGE_TEXT, 1, 300);
    
    MESSAGE_TEXT
    --------------------------------------------------------------------------------
    CNT
    ----------
    
    Fatal NI connect error 12170.
    63
    
    Errors in file /u01/app/oracle/diag/rdbms/MSDB/MSDB/trace/MSDB_j000_33284.trc
    (incident=663845):
    ORA-01578: ORACLE data block corrupted (file # 7, block # 2241925)
    ORA-01110: data file 7: '+DATATEST/MSDB/DATAFILE/default_tbs.298.1031185857'
    ORA-26040: Data block was loaded using the NOLOGGING o
    
    MESSAGE_TEXT
    --------------------------------------------------------------------------------
    CNT
    ----------
    1

**7- Check the latest Archivelog and Full Backup are done or not**

Use the following script to check Backups.

SELECT TO_CHAR (start_time, 'DD-MM-YYYY HH24:MI:SS') start_time, input_type, status, ROUND (elapsed_seconds / 3600, 1) time_hr,INPUT_BYTES/1024/1024/1024 IN_GB,OUTPUT_BYTES/1024/1024/1024 OUT_GB ,OUTPUT_DEVICE_TYPE FROM 
    v$rman_backup_job_details WHERE START_TIME > SYSDATE - 3 ORDER BY start_time DESC;

SQL> set pagesize 1000 line 200
    SQL> 
    SQL> SELECT TO_CHAR (start_time, 'DD-MM-YYYY  HH24:MI:SS') start_time,         input_type,         status,         ROUND (elapsed_seconds / 3600, 1) time_hr,INPUT_BYTES/1024/1024/1024 IN_GB,OUTPUT_BYTES/1024/1024/1024  OUT_GB ,OUTPUT_DEVICE_TYPE FROM 
      2  v$rman_backup_job_details   WHERE START_TIME > SYSDATE - 3 ORDER BY start_time DESC;
    
    START_TIME           INPUT_TYPE    STATUS                     TIME_HR      IN_GB     OUT_GB OUTPUT_DEVICE_TYP
    -------------------- ------------- ----------------------- ---------- ---------- ---------- -----------------
    10-03-2020  14:38:40 ARCHIVELOG    COMPLETED                        0 .874987602 .876464844 SBT_TAPE
    09-03-2020  18:39:21 DB INCR       COMPLETED                      5.9 1281.08734 1202.46387 SBT_TAPE
    08-03-2020  18:00:30 DB INCR       COMPLETED                      5.7 1279.00639  1200.3584 SBT_TAPE
    08-03-2020  17:27:04 ARCHIVELOG    COMPLETED                        0  .60765028 .608642578 SBT_TAPE
    07-03-2020  18:00:23 DB INCR       COMPLETED                      7.3 1279.00921 1200.35254 SBT_TAPE
    07-03-2020  15:22:58 ARCHIVELOG    COMPLETED                        0 .625060558 .626220703 SBT_TAPE
    
    73 rows selected.
    
    SQL>

**8- Check any session blocking the other session ( blocking session and Lock control )**

Use the following script to check Blocking session state.

select s1.username || '@' || s1.machine
    || ' ( SID=' || s1.sid || ' ) is blocking '
    || s2.username || '@' || s2.machine || ' ( SID=' || s2.sid || ' ) ' AS blocking_status
    from gv$lock l1, gv$session s1, gv$lock l2, gv$session s2
    where s1.sid=l1.sid and s2.sid=l2.sid
    and l1.BLOCK=1 and l2.request > 0
    and l1.id1 = l2.id1
    and l2.id2 = l2.id2 ;

**9- Check the DBMS jobs running or not and check the status of the Jobs**

Use the following script to check Scheduler jobs state.

-- Failed Scheduled Jobs 
    SELECT owner, job_name,status,LOG_DATE, ERROR#, ( EXTRACT (SECOND FROM run_duration) /60 + EXTRACT (MINUTE FROM run_duration) + EXTRACT (HOUR FROM run_duration) * 60 + EXTRACT (DAY FROM run_duration) * 60 * 24) MINUTES,ADDITIONAL_INFO 
    FROM dba_scheduler_job_run_details
    WHERE LOG_DATE > SYSDATE - 1 AND status != 'SUCCEEDED' ORDER BY 1 ASC, 4 DESC;
    
    
    
    -- Running and Succeeded Scheduled Jobs
    SELECT OWNER, JOB_NAME, LAST_START_DATE, STATE
    FROM DBA_SCHEDULER_JOBS
    WHERE LAST_START_DATE > SYSDATE - 1 AND STATE <> 'SCHEDULED';

**10- Check the Dataguard is synchronized or not.**

Use the following script to check Dataguard status

select process, client_process,thread#,sequence#,status from v$managed_standby where process like '%MRP%';
    
    select name,value from v$dataguard_stats;

set lines 1000 
    select name,value from v$dataguard_stats;

NAME                VALUE 
    -------------------------------- ------------------------- 
    transport lag        +00 00:03:52 
    apply lag            +00 00:03:54 
    apply finish time    +00 00:00:00.001
    estimated startup time 16 second

**11- Check the Performance Page of Enterprise Manager or Enterprise Manager Cloud Control**

Open Performance Page of Enterprise manager Cloud Control as follows to check Performance.

**12- Check the TOP session and TOP activity of database.**

Open TOP Activity Page of Enterprise manager Cloud Control as follows to check TOP Activity.

**13- Detect lock objects**

Use the following script to check Lock objects and tables.

SELECT B.Owner, B.Object_Name, A.Oracle_Username, A.OS_User_Name 
    FROM gv$Locked_Object A, All_Objects B
    WHERE A.Object_ID = B.Object_ID;

**14- Check the SQL query consuming lot of resources ( CPU and Disk Resources )**

Use the following script to check TOP CPU and Disk SQL Statements.

select * from (
    select ss.sql_text,
    a.SQL_ID, 
    sum(CPU_TIME_DELTA), 
    sum(DISK_READS_DELTA),
    count(*)
    from 
    DBA_HIST_SQLSTAT a, dba_hist_snapshot s,v$sql ss
    where
    s.snap_id = a.snap_id and a.sql_id=ss.sql_id
    and s.begin_interval_time > sysdate -1
    group by 
    ss.sql_text,a.SQL_ID
    order by 
    sum(CPU_TIME_DELTA) desc)
    where rownum<20;

**15- Check the usage of physical RAM and SGA – Paging or Swapping exist or not.**

[oracle@msddbadm01 ~]$ free -m

[oracle@msddbadm01 ~]$ free -m
                 total       used       free     shared    buffers     cached
    Mem:        772257     739605      32652       6174        491     397834
    -/+ buffers/cache:     341279     430978
    Swap:        24575       8035      16540

SQL> set linesize 150
    SQL> set pagesize 150
    SQL> select * from v$sgainfo;
    
    NAME                                  BYTES RES     CON_ID
    -------------------------------- ---------- --- ----------
    Fixed SGA Size                     29906520 No           0
    Redo Buffers                      207720448 No           0
    Buffer Cache Size                1.1543E+11 Yes          0
    In-Memory Area Size              2.1475E+10 No           0
    Shared Pool Size                 4.5634E+10 Yes          0
    Large Pool Size                  3758096384 Yes          0
    Java Pool Size                    536870912 Yes          0
    Streams Pool Size                2.6844E+10 Yes          0
    Shared IO Pool Size               536870912 Yes          0
    Data Transfer Cache Size                  0 Yes          0
    Granule Size                      536870912 No           0
    Maximum SGA Size                 2.1445E+11 No           0
    Startup overhead in Shared Pool  1180135528 No           0
    Startup NUMA Shared Pool memory  1.0737E+10 No           0
    Free SGA Memory Available         536870912              0
    
    15 rows selected.
    
    SQL> select * from v$sgastat;
    
    POOL           NAME                            BYTES     CON_ID
    -------------- -------------------------- ---------- ----------
                   fixed_sga                    29906520          0
                   buffer_cache               1.1489E+11          0
                   log_buffer                  207720448          0
                   shared_io_pool              536870912          0
    shared pool    free memory                6701646384          0
    shared pool    v_inc_meter_info_problem         1728          0
    shared pool    kghpinfo freelist                 192          0
    shared pool    enqueue_hash                   222864          0
    shared pool    kmgsb circular statistics      162560          0
    shared pool    SGA Obsolete Param Source          24          0

**16- Check Log Switch and Archivelog generation frequency.**

You can query and list the Log Switch ( Archivelog ) Frequency map according to per hour and daily as follows.

select to_char(first_time,'YYYY-MON-DD') day,
    to_char(sum(decode(to_char(first_time,'HH24'),'00',1,0)),'9999') "00",
    to_char(sum(decode(to_char(first_time,'HH24'),'01',1,0)),'9999') "01",
    to_char(sum(decode(to_char(first_time,'HH24'),'02',1,0)),'9999') "02",
    to_char(sum(decode(to_char(first_time,'HH24'),'03',1,0)),'9999') "03",
    to_char(sum(decode(to_char(first_time,'HH24'),'04',1,0)),'9999') "04",
    to_char(sum(decode(to_char(first_time,'HH24'),'05',1,0)),'9999') "05",
    to_char(sum(decode(to_char(first_time,'HH24'),'06',1,0)),'9999') "06",
    to_char(sum(decode(to_char(first_time,'HH24'),'07',1,0)),'9999') "07",
    to_char(sum(decode(to_char(first_time,'HH24'),'08',1,0)),'9999') "08",
    to_char(sum(decode(to_char(first_time,'HH24'),'09',1,0)),'9999') "09",
    to_char(sum(decode(to_char(first_time,'HH24'),'10',1,0)),'9999') "10",
    to_char(sum(decode(to_char(first_time,'HH24'),'11',1,0)),'9999') "11",
    to_char(sum(decode(to_char(first_time,'HH24'),'12',1,0)),'9999') "12",
    to_char(sum(decode(to_char(first_time,'HH24'),'13',1,0)),'9999') "13",
    to_char(sum(decode(to_char(first_time,'HH24'),'14',1,0)),'9999') "14",
    to_char(sum(decode(to_char(first_time,'HH24'),'15',1,0)),'9999') "15",
    to_char(sum(decode(to_char(first_time,'HH24'),'16',1,0)),'9999') "16",
    to_char(sum(decode(to_char(first_time,'HH24'),'17',1,0)),'9999') "17",
    to_char(sum(decode(to_char(first_time,'HH24'),'18',1,0)),'9999') "18",
    to_char(sum(decode(to_char(first_time,'HH24'),'19',1,0)),'9999') "19",
    to_char(sum(decode(to_char(first_time,'HH24'),'20',1,0)),'9999') "20",
    to_char(sum(decode(to_char(first_time,'HH24'),'21',1,0)),'9999') "21",
    to_char(sum(decode(to_char(first_time,'HH24'),'22',1,0)),'9999') "22",
    to_char(sum(decode(to_char(first_time,'HH24'),'23',1,0)),'9999') "23"
    from v$log_history group by to_char(first_time,'YYYY-MON-DD');

Query result is as follows.