[mso] Re: Access Index
- From: chizotz@xxxxxxxxx
- To: mso@xxxxxxxxxxxxx
- Date: Wed, 11 Aug 2004 16:25:17 +0000
You can create indexes on tables through SQL. The syntax is
CREATE [UNIQUE] INDEX indexName
ON tableName (column1Name [,column2Name,...])
[WITH [PRIMARY | DISALLOW NULL | IGNORE NULL]
examples:
CREATE INDEX idx_acct_nbr
ON tblCustomers (acct_nbr)
WITH PRIMARY;
Would create a primary key (no duplicates, no nulls) index on the acct_nbr
field in the tblCustomers table.
CREATE UNIQUE INDEX idx_ssn
ON tblCustomers (ssn)
WITH DISALLOW NULL;
would create an index on the ssn field in tblCustomers, no duplicates and no
nulls but does not make it a primary key.
CREATE INDEX idx_zip
ON tblCustomers (zip);
would simply create a non-unique index on the zip field.
You can include multiple column indexes by including them in the field list
seperated by commas. Experiment with your data to get the indexes you need
working. This will be better that the append method you describe in that the
deleting and appending of records will cause your file size to grow and more
quickly require compaction, while adding indexes to existing tables will only
increase the file size by the size of the index and won't directly cause the
need for more frequent compactions.
HTH,
Ron
> Hi All.
> I get new tables every morning for a database. The tables are not
> indexed. Indexing makes a huge difference in processing speed when
> running queries so I manually index the tables. The tables always have
> the same name. Is there a way to make the desired indexes happen by
> default? Or can some process be written the sets the indexes?
>
> The only thing I've been able to think of is to create duplicate tables
> with the index set then use append queries to post the new daily data
> and run all queries, etc off the indexed tables. The process would be
>
> delete data from indexed tables
> run append queries on new tables to post fresh data to indexed tables
>
> does this make sense? is there a better way?
>
> thanks. /g
>
>
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