Most users are satisfied
with the passage of shape files to the ArcGis geodatabase . However
, they notice a decrease in performance after editing heavy sessions.
Their issue is how to correctthis problem.
We will discuss in
article the concept of compacting a geodatabase
. As compression ( see with ArcGis 2- Geodabases Compression ),
compacting reduces the size of the ArcGIS geodatabase
order to speed up requests . However , compacting works
compared to compression.
loss compression, the compression, generally, erases
data byte from the geodatabase . It re-groups the data bytes
to the redundancy of information : if you have
ten lines with the value “8”, the compression will keep 10 (8)
instead of 8 8 8 8 8 8 8 8 8 8.
compacting, the process physically removes
cleans up the orphan (useless) records .
will show how to compact, but we must, firstly, understand
happens when editing the
When you delete
a record , obviously , you could think
that these records are,
and that the sequence of records in the table go is taken to the next level to
fill the hole . However , this is
not exactly what happens; these
the geodatabase . If it were necessary to
the records at each update the editing would take too much time.
is why the software only marks the records as
ignores these recordings in
future requests. So what happens
when you try to locate a record ?
program must browse all the
records and, if the record is
marked as erased it
advances to the next , otherwise it checks whether it matches the request or not .
they are deleted , they are ,
in a way , the reason for the slowing down of the query.
So how does the compacting
exactly work? As you
have, already, guessed , compacting performs
the removal of these recordings and
the others orphans who are not being used
by others objects . This is why
compacting speeds up geodatabases file and personal (access) queries.
It’s easy to compact a geodatabase file
access. It is recommended
to compact a geodatabase after a heavy
compact a geodatabase file or access,
perform the following steps:
1. Open ArcCatalog and select the
geodatabase to compact.
2. Right- click to open the
context menu , select Administration, then
click Compact Geodatabase
There are no counter indications for compacting .
It is somehow like the hard disk
defragmentation: it does not accelerate if it is
not necessary but it
does not slow down the processing.
more information, please visit the ArcGIs
In the following (and final) article
we will discuss how to perform the compacting and the geodatabases saving with
a single click
setting up a processing model with Model Builder.