What Does Internal sql 'KSXM:TAKE_SNPSHOT' With SQLID 3wh9htctp7199 During Insert...' Do and Does It Have Performance Impact?
(Doc ID 2435833.1)
Last updated on JUNE 04, 2023
Applies to:
Oracle Database - Enterprise Edition - Version 12.2.0.1 and laterInformation in this document applies to any platform.
Goal
What is the following internal sql do and does it have a performance impact:
insert /* KSXM:TAKE_SNPSHOT */ into sys.optstat_snapshot$ (obj#, inserts, updates, deletes, timestamp, flags) (select m.obj#, m.inserts, m.updates, m.deletes, systimestamp, dbms_stats_advisor.compute_volatile_flag( m.obj#, m.flags, :flags, m.inserts, m.updates, m.deletes, s.inserts, s.updates, s.deletes, null, nvl(to_number(p.valchar), :global_stale_pcnt), s.gather) flags from sys.mon_mods_all$ m, (select si.obj#, max(si.inserts) inserts, max(si.updates) updates, max(si.deletes) deletes, decode(bitand(max(si.flags), :gather_flag), 0, 'NO_GATHER', 'GATHER') gather, max(si.timestamp) timestamp from sys.optstat_snapshot$ si, (select obj#, max(timestamp) ts from sys.optstat_snapshot$ group by obj#) sm where si.obj# = sm.obj# and si.timestamp = sm.ts group by si.obj#) s, sys.optstat_user_prefs$ p where m.obj# = s.obj#(+) and m.obj# = p.obj#(+) and pname(+) = 'STALE_PERCENT' and m.obj# = :objn).
insert /* KSXM:TAKE_SNPSHOT */ into sys.optstat_snapshot$ (obj#, inserts, updates, deletes, timestamp, flags) (select m.obj#, m.inserts, m.updates, m.deletes, systimestamp, dbms_stats_advisor.compute_volatile_flag( m.obj#, m.flags, :flags, m.inserts, m.updates, m.deletes, s.inserts, s.updates, s.deletes, null, nvl(to_number(p.valchar), :global_stale_pcnt), s.gather) flags from sys.mon_mods_all$ m, (select si.obj#, max(si.inserts) inserts, max(si.updates) updates, max(si.deletes) deletes, decode(bitand(max(si.flags), :gather_flag), 0, 'NO_GATHER', 'GATHER') gather, max(si.timestamp) timestamp from sys.optstat_snapshot$ si, (select obj#, max(timestamp) ts from sys.optstat_snapshot$ group by obj#) sm where si.obj# = sm.obj# and si.timestamp = sm.ts group by si.obj#) s, sys.optstat_user_prefs$ p where m.obj# = s.obj#(+) and m.obj# = p.obj#(+) and pname(+) = 'STALE_PERCENT' and m.obj# = :objn).
Solution
To view full details, sign in with your My Oracle Support account. |
|
Don't have a My Oracle Support account? Click to get started! |
In this Document
| Goal |
| Solution |
| References |