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AWR Report Analysis

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AWR report analysis is important for  Oracle DBA on Daily issues or P1/P2 issues time. Below some of the main things we general look to figure out issue. 1. 2.  3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13.
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Goldengate 19c Installation with issue resolution

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  Basic Installation of GoldenGate 19c in OEL6. Tested with below requirements: Step1: Vmware requirements:   For installing OEL6.8 and Oracle DB 12c  installation, please refer URL https://venuoracledba.blogspot.com/2020/08/oracle-12c-2-node-rac-setup-in-vmware.html     Step2: After OEL6.8 installation finished. We will use /opt for goldengate installation.   Step3: unzip GG software in folder. Here unzipped in gg_software folder.     Folder fbo_ggs_Linux_x64_shiphome will create. Step4:  Enable GUI by issuing x host + command in root user. and keep open this root terminal.   Step5:  Enable GUI by issuing x host + command in oracle user.   Move to software path   execute ./runInstaller and select database version. Selected 12c version for my environment. and click Next     provide GG home, oracle home and port number and click Next.     After verifying paths and information, Click Install       Click Close.     Step6: run ggsci from GG_HOME to check GG status. Got libnnz12.so librar
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Oracle 12c 2-node RAC setup in VMware Player 15 -- Part01

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Tried to install Oracle 12c 2-node RAC for testing purpose but due to low Hardware configuration, ended up with Single Node RAC. I got lot of issues during Installation and tried to resolve them with my best knowledge. Please find below installation steps and troubleshooting. Main issues started from Step90. you can go through quickly. Requirements Most of the times, bridge option in VMWARE will not connect with host machine. I tried below option to use internet connection from host machine. We need to cross verify vmnet8 is NAT or not. Installation Steps Step1 launch VMware and click on New Virtual Machine Step2   select OEL iso Image Step3 Provide New Virtual Machine Name Step4 Provide HDD size and select single virtual disk. Step5  Select host setting for monitor and Network as NAT Step6 New Virtual Machine is ready for launch. Step7 OEL Installation starts automatically. Press Enter Step8 Skip Disk Checking
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Execution_Explain Plan

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Whenever we get request for application slowness or sql query then we need to identify sql_id and to analyze sql_id, we need to check SQL execution/explain plan. 1. EXECUTION_PLAN: select id,plan_hash_value,operation, options,object_name,cardinality,cost,bytes,cpu_cost,io_cost,time,partition_start,partition_stop, object_node,other_tag,qblock_name,other_xml from dba_hist_sql_plan where sql_id='<SQL_ID>'; or select * from table(dbms_xplan.display_awr('<SQL_ID>')); EXPLAIN_PLAN: explain plan for <SQL_QUERY>; select * from table(dbms_xplan.display);
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Oracle to Postgres

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  Round 1: Created metadata for tables, sequences, packages Round 2: Created indexes Round 3: freeze column name to freezes to_date function updated GEOMETRY datatype , installed POSTGIS package to support this datatype Round 4: created triggers created Functions Migration: bash-4.2$ pwd /usr/edb/migrationtoolkit/etc bash-4.2$ cat toolkit.properties SRC_DB_URL=jdbc:oracle:thin:@localhost:1521:orcl SRC_DB_USER=hr SRC_DB_PASSWORD=hr TARGET_DB_URL=jdbc:edb://postoffline:5444/dev TARGET_DB_USER=enterprisedb TARGET_DB_PASSWORD=password bash-4.2$  -bash-4.2$ pwd /usr/edb/migrationtoolkit/bin -bash-4.2$ ls -lrt total 724 -rwxr-xr-x. 1 root root   2439 Dec 11 13:29 runJavaApplication.sh -rwxr-xr-x. 1 root root    544 Dec 11 13:33 runMTK.sh -rwxr-xr-x. 1 root root 729258 Dec 11 13:33 edb-migrationtoolkit.jar -bash-4.2$  ./runMTK.sh HR OUTPUT: Running EnterpriseDB Migration Toolkit (Build 55.7.0) ... Source database connectivity info... conn =jdbc:oracle:thin:@oel712c:1521/ORCLPDB user =HR passw
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Active Session History Analysis

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ASH  analysis is important for  Oracle DBA on Daily issues or P1/P2 issues time. Below some of the main events we general look to figure out issue. RAC / Cloud RDS: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Redo Generation: 14. 15.
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General Queries

                                                                              Tablespace growth Size We can use view to check tablespace size greater than 80% RAC / NON-RAC / Cloud RDS: SELECT tbm.TABLESPACE_NAME,   round(tbm.USED_SPACE * tb.BLOCK_SIZE /(1024*1024*1024),2) as USED_SPACE_GB,   round(tbm.TABLESPACE_SIZE * tb.BLOCK_SIZE /(1024*1024*1024),2) as TBS_SIZE_GB,   round((tbm.TABLESPACE_SIZE - tbm.USED_SPACE) * tb.BLOCK_SIZE /(1024*1024*1024),2) as TBS_FREE_SIZE_GB,   round(tbm.USED_PERCENT) as PERCENT_USEDFROM dba_tablespace_usage_metrics tbm      join dba_tablespaces tb on tb.TABLESPACE_NAME = tbm.TABLESPACE_NAME where round(tbm.USED_PERCENT) > 80;"; SQL monitoring We can use to check current executing SQL's. RAC / Cloud RDS: select inst_id,status,round(elapsed_time/1000000,2) as duration_secs,sql_id,sql_plan_hash_value,username, px_maxdop as degree_of_parallelism, px_maxdop_instances as instances_used, px_is_cross_instance as cross_instance,user_io_wait_time,clust
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Fragmentation & Re-organisation

Total  Savings: set verify off column file_name format a50 word_wrapped column smallest format 999,990 heading "Smallest|Size|Poss." column currsize format 999,990 heading "Current|Size" column savings format 999,990 heading "Poss.|Savings" break on report compute sum of savings on report column value new_val blksize select value from v$parameter where name = 'db_block_size' / select file_name, ceil( (nvl(hwm,1)*&amp;&amp;blksize)/1024/1024 ) smallest, ceil( blocks*&amp;&amp;blksize/1024/1024) currsize, ceil( blocks*&amp;&amp;blksize/1024/1024) - ceil( (nvl(hwm,1)*&amp;&amp;blksize)/1024/1024 ) savings from dba_data_files a, ( select file_id, max(block_id+blocks-1) hwm from dba_extents group by file_id ) b where a.file_id = b.file_id(+) order by savings desc / HWM query for all datafiles: col data_file_name for a50 col tablespace_name for a20 set lines 300 select tablespace_name, file_id, file_name DATA_FILE_NAME, Al
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Postgresql installation offline using NGINX

  [root@localhost yumdownloaddir]# sudo  yum -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm Loaded plugins: langpacks, ulninfo epel-release-latest-7.noarch.rpm                                                                                                                                                            |  15 kB  00:00:00      Examining /var/tmp/yum-root-dewJ5H/epel-release-latest-7.noarch.rpm: epel-release-7-14.noarch Marking /var/tmp/yum-root-dewJ5H/epel-release-latest-7.noarch.rpm to be installed Resolving Dependencies --> Running transaction check ---> Package epel-release.noarch 0:7-14 will be installed --> Finished Dependency Resolution https://username@gmail.com:password@yum.enterprisedb.com/edb/redhat/rhel-7Server-x86_64/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found Trying other mirror. enterprisedb-enterprise/x86_64/signature                                                                                     
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OEM patches & vulnerabilities

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  Tools: Agent: agentpatcher OMS: omspatcher coherence/weblogic: optach 1. Agent JDK update. please refer the below oracle reference page Supported Java SE Downloads on MOS (oracle.com) 2. Removing log4j-core-2.8.2.jar validate jar file exist cd $OEM_BASE/gc_inst/user_projects/domains/GCDomain/servers/EMGC_OMS1/tmp/_WL_user/emdb/1danf1/database/jet/emsaasui/emcdbms-ui/ear/APP-INF/lib $OEM_BASE/agent_13.5.0.0.0/oracle_common/jdk/bin/jar tvf log4j-core-2.8.2.jar | grep JndiLookup.class output 2974 Sun Apr 02 15:24:22 AEST 2017 org/apache/logging/log4j/core/lookup/JndiLookup.class stop OMS  $OEM_BASE/middleware/bin/emctl status oms -details  $OEM_BASE/middleware/bin/emctl stop oms -all remove log4j zip -q -d log4j-core-2.8.2.jar org/apache/logging/log4j/core/lookup/JndiLookup.class validate jar file exist $OEM_BASE/agent_13.5.0.0.0/oracle_common/jdk/bin/jar tvf log4j-core-2.8.2.jar | grep JndiLookup.class start OMS  $OEM_BASE/middleware/bin/emctl status oms -details  $OEM_BASE/middleware/
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