Physical Backups in MySQL (Article -20). In this article we can cover Physical backups in MySQL. Physical backups consist of raw copies of the directories and files that store database contents. This type of backup is suitable for large, important databases that need to be… Read More
PYTHON VIMEO LINKS. S.NO CLASS DATE VIMEO LINK PASSWORD TOPIC DESCRIPTION 1 11-30-2018 https://vimeo.com/304073630 python demo 2 12-05-2018 https://vimeo.com/304664589 python introduction to python 3 12-06-2018 https://vimeo.com/304876280 python applications of python and Environment setup,variables. 4 12-07-2018 https://vimeo.com/305098826 python installation of python software, how to develope… Read More
BASIC SQL CLASS (Vimeo Links). S.no Video Vimeo Link Password Topic Description 1 Class-1 https://vimeo.com/285140850 sql Introduction to DBMS. What is SQL? History of SQL? Features of SQL? What are Codd Rules? 2 Class-2 https://vimeo.com/285330531 sql Oracle installation on windows platform. Explanation about codd rules.… Read More
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MAKING RAW MyISAM BACKUP IN MySQL (Article -19). MyISAM was the default storage engine for the MySQL relational database management system versions prior to 5.5 released in December 2009. it is based on the older ISAM code. Filesystem Each MyISAM table is stored on disk in three files (if it is not partitioned).… Read More
MySQL Master-Slave Replication on different AWS instances. In this article i want show how to configure master-slave replication in two different machines. What is Replication ? Replication is the continuous copying of data changes from one database (MASTER) to another database (SLAVE ). The two… Read More
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/********************************************************************** * File: sqlhistory.sql * Type: SQL*Plus script * Author: Tim Gorman (Evergreen Database Technologies, Inc.) * Date: 29sep08 * * Description: * SQL*Plus script to query the "history" of a specified SQL * statement, using its "SQL ID" across all database instances * in a database, using the AWR repository. This report is useful * for obtaining an hourly perspective on SQL statements seen in * more aggregated reports. * * Modifications: * TGorman 29sep08 adapted from the earlier STATSPACK-based * "sphistory.sql" script *********************************************************************/ set echo off set feedback off timing off verify off pagesize 100 linesize 130 recsep off set serveroutput on size 1000000 format wrapped trimout on trimspool on col phv heading "Plan|Hash Value" col snap_time format a12 truncate heading "Snapshot|Time" col execs format 999,990 heading "Execs" col lio_per_exec format 999,999,999,990.00 heading "Avg LIO|Per Exec" col pio_per_exec format 999,999,999,990.00 heading "Avg PIO|Per Exec" col cpu_per_exec format 999,999,999,990.00 heading "Avg|CPU (secs)|Per Exec" col ela_per_exec format 999,999,999,990.00 heading "Avg|Elapsed (secs)|Per Exec" col sql_text format a64 heading "Text of SQL statement" clear breaks computes ttitle off btitle off accept V_SQL_ID prompt "Enter the SQL_ID: " accept V_NBR_DAYS prompt "Enter number of days (backwards from this hour) to report (default: ALL): " variable v_nbr_days number spool sqlhistory_&&V_SQL_ID declare cursor get_phv(in_sql_id in varchar2, in_days in integer) is select ss.plan_hash_value, min(s.begin_interval_time) min_time, max(s.begin_interval_time) max_time, min(s.snap_id) min_snap, max(s.snap_id) max_snap, sum(ss.executions_delta) sum_execs, sum(ss.disk_reads_delta) sum_disk_reads, sum(ss.buffer_gets_delta) sum_buffer_gets, sum(ss.cpu_time_delta)/1000000 sum_cpu_time, sum(ss.elapsed_time_delta)/1000000 sum_elapsed_time from dba_hist_sqlstat ss, dba_hist_snapshot s where ss.dbid = s.dbid and ss.instance_number = s.instance_number and ss.snap_id = s.snap_id and ss.sql_id = in_sql_id and ss.executions_delta > 0 and s.begin_interval_time >= sysdate-in_days group by ss.plan_hash_value order by sum_elapsed_time desc; -- cursor get_xplan(in_sql_id in varchar2, in_phv in number) is select plan_table_output from table(dbms_xplan.display_awr(in_sql_id, in_phv, null, 'ALL -ALIAS')); -- v_prev_plan_hash_value number := -1; v_text_lines number := 0; v_errcontext varchar2(100); v_errmsg varchar2(100); v_display_sql_text boolean; -- begin -- v_errcontext := 'query NBR_DAYS from DUAL'; select decode('&&V_NBR_DAYS','',10,to_number(nvl('&&V_NBR_DAYS','10'))) into :v_nbr_days from dual; -- v_errcontext := 'open/fetch get_phv'; for phv in get_phv('&&V_SQL_ID', :v_nbr_days) loop -- if get_phv%rowcount = 1 then -- dbms_output.put_line('+'|| rpad('-',12,'-')|| rpad('-',10,'-')|| rpad('-',10,'-')|| rpad('-',12,'-')|| rpad('-',15,'-')|| rpad('-',15,'-')|| rpad('-',12,'-')|| rpad('-',12,'-')||'+'); dbms_output.put_line('|'|| rpad('Plan HV',12,' ')|| rpad('Min Snap',10,' ')|| rpad('Max Snap',10,' ')|| rpad('Execs',12,' ')|| rpad('LIO',15,' ')|| rpad('PIO',15,' ')|| rpad('CPU',12,' ')|| rpad('Elapsed',12,' ')||'|'); dbms_output.put_line('+'|| rpad('-',12,'-')|| rpad('-',10,'-')|| rpad('-',10,'-')|| rpad('-',12,'-')|| rpad('-',15,'-')|| rpad('-',15,'-')|| rpad('-',12,'-')|| rpad('-',12,'-')||'+'); -- end if; -- dbms_output.put_line('|'|| rpad(trim(to_char(phv.plan_hash_value)),12,' ')|| rpad(trim(to_char(phv.min_snap)),10,' ')|| rpad(trim(to_char(phv.max_snap)),10,' ')|| rpad(trim(to_char(phv.sum_execs,'999,999,990')),12,' ')|| rpad(trim(to_char(phv.sum_buffer_gets,'999,999,999,990')),15,' ')|| rpad(trim(to_char(phv.sum_disk_reads,'999,999,999,990')),15,' ')|| rpad(trim(to_char(phv.sum_cpu_time,'999,990.00')),12,' ')|| rpad(trim(to_char(phv.sum_elapsed_time,'999,990.00')),12,' ')||'|'); -- v_errcontext := 'fetch/close get_phv'; -- end loop; dbms_output.put_line('+'|| rpad('-',12,'-')|| rpad('-',10,'-')|| rpad('-',10,'-')|| rpad('-',12,'-')|| rpad('-',15,'-')|| rpad('-',15,'-')|| rpad('-',12,'-')|| rpad('-',12,'-')||'+'); -- v_errcontext := 'open/fetch get_phv'; for phv in get_phv('&&V_SQL_ID', :v_nbr_days) loop -- if v_prev_plan_hash_value <> phv.plan_hash_value then -- v_prev_plan_hash_value := phv.plan_hash_value; v_display_sql_text := FALSE; -- v_text_lines := 0; v_errcontext := 'open/fetch get_xplan'; for s in get_xplan('&&V_SQL_ID', phv.plan_hash_value) loop -- if v_text_lines = 0 then dbms_output.put_line('.'); dbms_output.put_line('========== PHV = ' || phv.plan_hash_value || '=========='); dbms_output.put_line('First seen from "'|| to_char(phv.min_time,'MM/DD/YY HH24:MI:SS') || '" (snap #'||phv.min_snap||')'); dbms_output.put_line('Last seen from "'|| to_char(phv.max_time,'MM/DD/YY HH24:MI:SS') || '" (snap #'||phv.max_snap||')'); dbms_output.put_line('.'); dbms_output.put_line( rpad('Execs',15,' ')|| rpad('LIO',15,' ')|| rpad('PIO',15,' ')|| rpad('CPU',15,' ')|| rpad('Elapsed',15,' ')); dbms_output.put_line( rpad('=====',15,' ')|| rpad('===',15,' ')|| rpad('===',15,' ')|| rpad('===',15,' ')|| rpad('=======',15,' ')); dbms_output.put_line( rpad(trim(to_char(phv.sum_execs,'999,999,999,990')),15,' ')|| rpad(trim(to_char(phv.sum_disk_reads,'999,999,999,990')),15,' ')|| rpad(trim(to_char(phv.sum_buffer_gets,'999,999,999,990')),15,' ')|| rpad(trim(to_char(phv.sum_cpu_time,'999,999,990.00')),15,' ')|| rpad(trim(to_char(phv.sum_elapsed_time,'999,999,990.00')),15,' ')); dbms_output.put_line('.'); end if; -- if v_display_sql_text = FALSE and s.plan_table_output like 'Plan hash value: %' then -- v_display_sql_text := TRUE; -- end if; -- if v_display_sql_text = TRUE then -- dbms_output.put_line(s.plan_table_output); -- end if; -- v_text_lines := v_text_lines + 1; -- end loop; -- end if; -- v_errcontext := 'fetch/close get_phv'; -- end loop; -- exception when others then v_errmsg := sqlerrm; raise_application_error(-20000, v_errcontext || ': ' || v_errmsg); end; / break on report compute sum of execs on report compute avg of lio_per_exec on report compute avg of pio_per_exec on report compute avg of cpu_per_exec on report compute avg of ela_per_exec on report ttitle center 'Summary Execution Statistics Over Time' select to_char(s.begin_interval_time, 'DD-MON HH24:MI') snap_time, ss.executions_delta execs, ss.buffer_gets_delta/decode(ss.executions_delta,0,1,ss.executions_delta) lio_per_exec, ss.disk_reads_delta/decode(ss.executions_delta,0,1,ss.executions_delta) pio_per_exec, (ss.cpu_time_delta/1000000)/decode(ss.executions_delta,0,1,ss.executions_delta) cpu_per_exec, (ss.elapsed_time_delta/1000000)/decode(ss.executions_delta,0,1,ss.executions_delta) ela_per_exec from dba_hist_snapshot s, dba_hist_sqlstat ss where ss.dbid = s.dbid and ss.instance_number = s.instance_number and ss.snap_id = s.snap_id and ss.sql_id = '&&V_SQL_ID' and ss.executions_delta > 0 and s.begin_interval_time >= sysdate - :v_nbr_days order by s.snap_id; clear breaks computes break on phv skip 1 on report compute sum of execs on phv compute avg of lio_per_exec on phv compute avg of pio_per_exec on phv compute avg of cpu_per_exec on phv compute avg of ela_per_exec on phv ttitle center 'Per-Plan Execution Statistics Over Time' select ss.plan_hash_value phv, to_char(s.begin_interval_time, 'DD-MON HH24:MI') snap_time, ss.executions_delta execs, ss.buffer_gets_delta/decode(ss.executions_delta,0,1,ss.executions_delta) lio_per_exec, ss.disk_reads_delta/decode(ss.executions_delta,0,1,ss.executions_delta) pio_per_exec, (ss.cpu_time_delta/1000000)/decode(ss.executions_delta,0,1,ss.executions_delta) cpu_per_exec, (ss.elapsed_time_delta/1000000)/decode(ss.executions_delta,0,1,ss.executions_delta) ela_per_exec from dba_hist_snapshot s, dba_hist_sqlstat ss where ss.dbid = s.dbid and ss.instance_number = s.instance_number and ss.snap_id = s.snap_id and ss.sql_id = '&&V_SQL_ID' and ss.executions_delta > 0 and s.begin_interval_time >= sysdate - :v_nbr_days order by ss.plan_hash_value, s.snap_id; clear breaks computes spool off set verify on echo on feedback on ttitle off |
