Oracle create index

create table scott.idx_object_id on scott.test(object_id);

Now you need to scott.test Of object_id Create an index on the column , For example, there are 50GB

How can I check this process halfway , It should be Mr. Cheng as a temporary section , What about the size of this temporary segment ？

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Other answers 1：

If you are concerned about the progress of index creation , You can query v$session_longops View .

Other answers 2：

Hello! , I am not concerned about this progress , It's the size change of that temporary segment

Other answers 3：

You can try this , Just tested , Not bad .

select k.inst_id "INST_ID",
ktssoses "SADDR",
sid,
ktssosno "SERIAL#",
username "USERNAME",
osuser "OSUSER",
ktssosqlid "SQL_ID",
ktssotsn "TABLESPACE",
decode(ktssocnt, 0, 'PERMANENT', 1, 'TEMPORARY') "CONTENTS",
-- Pay attention to 12c Of v$sort_usage In the definition TABLESPACE and CONTENTS It has changed .
decode(ktssosegt, 1, 'SORT', 2, 'HASH', 3, 'DATA', 4, 'INDEX',
5, 'LOB_DATA', 6, 'LOB_INDEX' , 'UNDEFINED') "SEGTYPE",
ktssofno "SEGFILE#",
ktssobno "SEGBLK#",
ktssoexts "EXTENTS",
ktssoblks "BLOCKS",
round(ktssoblks*p.value/1024/1024, 2) "SIZE_MB",
ktssorfno "SEGRFNO#"
from x$ktsso k, v$session s,
(select value from v$parameter where name='db_block_size') p
where ktssoses = s.saddr
and ktssosno = s.serial#; 

Other answers 4：

Thank you two , Today's test has found a way , At the time of creation dba_segments.segment_type Would be TEMPORARY, Until the index is created , according to dba_segments Just count

Other answers 5：

When the index creation action is executed , You can query the following sql To monitor the progress of index creation ：

  

   select L.sid ssid, l.SERIAL#, l.START_TIME, substr(OPNAME, 1, 15) opname, target, trunc((sofar / totalwork) * 100) pct, to_char(60 * sofar * 8192 / (24 * 60 * (last_update_time - start_time)) / 1024 / 1024 / 60, '9999.0') Rate, elapsed_seconds / 60 es, time_remaining / 60 tr, PROGRAM, MACHINE from gv$session_longops L, gV$SESSION S where time_remaining > 0 AND L.SID = S.SID;
  

Index creation takes precedence by default PGA, When ALLOC GB exceed PGA Big hour , Will be used for temporary tablespaces , And the speed will be relatively slow , Therefore, it is necessary to monitor the use of temporary tables ：

  

   --  Temporary table space  sort segment  usage select tablespace_name,current_users,total_blocks,used_blocks,free_blocks,added_extents,extent_hits,freed_extents,free_requests,max_blocks,max_used_blocks,max_sort_blocks from gv$sort_segment;--  Session information of temporary table space select username,session_num,sql_id,tablespace,contents,segtype,segfile#,segblk#,extents,blocks from gv$tempseg_usage;--  Temporary table space usage select df.tablespace_name "Tablespace", df.totalspace "Total(MB)", nvl(FS.UsedSpace, 0) "Used(MB)", (df.totalspace - nvl(FS.UsedSpace, 0)) "Free(MB)", round(100 * (1-( nvl(fs.UsedSpace, 0) / df.totalspace)), 2) "Pct. Free(%)"FROM (SELECT tablespace_name, round(SUM(bytes) / 1048576) TotalSpace FROM dba_TEMP_files GROUP BY tablespace_name) df, (SELECT tablespace_name, ROUND(SUM(bytes_used) / 1024 / 1024) UsedSpace FROM gV$temp_extent_pool GROUP BY tablespace_name) fs WHERE df.tablespace_name = fs.tablespace_name(+);
  

Of course, it can also be used in advance dbms_space.create_index_cost To evaluate the size of the index ：, But the accuracy depends on whether the statistical information is accurate , For reference only ：

  

   set serveroutput onDECLARE used_bytes NUMBER; alloc_bytes NUMBER;BEGIN dbms_space.create_index_cost(' Create an index statement ', used_bytes, alloc_bytes); dbms_output.put_line('index used gb: ' || round(used_bytes/1024/1024/1024,2) || 'G; ' || 'index alloc gb: ' || round(alloc_bytes/1024/1024/1024,2) || 'G;');END;/
  

I hope I can help you ~

Other answers 6：

well , Thank you thank you , Collected