Oracle

 Check the query is triggered from any procedure SELECT s.sql_id, s.sql_text FROM gv$sqlarea s JOIN dba_objects o ON s.program_id = o.object_id and o.object_name = ‘&procedure_name’

 Find top 10 Queries from high physical read SELECT schema, sql_text, disk_reads, round(cpu,2) FROM (SELECT s.parsing_schema_name schema, t.sql_id, t.sql_text, t.disk_reads, t.sorts, t.cpu_time/1000000 cpu, t.rows_processed, t.elapsed_time FROM v$sqlstats t join v$sql …

 Check the dataguard status for two Node RAC If you have 3 Node RAC then you can add more union clause and copy paste the select query from union clause …

 Error: ORA-00018 maximum number of sessions exceeded SQL> drop table test; drop table test * ERROR at line 1: ORA-00018: maximum number of sessions exceeded Cause: Maximum number of session …

 <aside> 💡 Steps to move the Oracle Grid Home location in Oracle Environment </aside> Login with root user, Stop CRS services. cd /u01/app/12.2.0/grid/bin ./crsctl stop crs ./crsctl stop cluster Login with …

 Error ORA-04031: unable to allocate nnn bytes of shared memory Solution Need to add more memory to the Shared pool area. Check the size of memory allocate to shared_pool_size, shared_pool_reserved_size …

 Check the Generated archive log in Primary Database –Run on Primary Server: select thread#, max(sequence#) “Last Primary Seq Generated” from v$archived_log val, v$database vdb where val.resetlogs_change# = vdb.resetlogs_change# group by …

 Enable DDL logging in Oracle can be done in several ways. Enable the parameter ENABLE_DDL_LOGGING in Oracle 12c Enable the audit of the database and enable DDL auditing on objects …

 What is Active DataGuard DML Redirection? Active Dataguard DML Redirection feature present in Oracle 19c. In this feature DML(insert/update/delete) operation can performed on Standby Database which redirected to Primary Database …

 Error: Following error occurred during insert/DML operation on the Standby side of Active Dataguard in Oracle. On Standby Database: [oracle@orcl19c ~]$ sqlplus / as sysdba SQL*Plus: Release 19.0.0.0.0 – Production …