capture oracle bind_variable value_string null

Hello,

How can I capture bind variable for sql_id. I have tested the following script but the value_string is null and the sattistics level is typical.

select  sql_id,  t.sql_text SQL_TEXT,  b.name BIND_NAME,  b.value_string BIND_STRING
from  v$sql t  join DBA_HIST_SQLBIND b  using (sql_id)
where  b.value_string is not null  and sql_id='d4yj18kvu48j2'
/

Thanks
bibi92Asked:
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slightwv (䄆 Netminder) Commented:
I've not used DBA_HIST_SQLBIND.

Whenever I've looked up bind variables I've used v$sql_bind_capture
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sdstuberCommented:
dba_hist_sqlbind isn't exhaustive.  It's only captures snapshots - as represented by the SNAP_ID column.

You can try to look in v$sql_bind_capture if you ran your query recently but even that isn't guaranteed.

There's even a column for that "WAS_CAPTURED" which, if NO, means it wasn't captured
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sdstuberCommented:
If you want to be sure to capture all binds ever used then trace your session with bind capture on then run your query and check the file.

obviously, this isn't something you'd have turned on all the time.
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sdstuberCommented:
A split is probably in order here.

slightwv also posted  v$sql_bind_capture, but before me
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