Hi,
I have a real basic table index question. If I have a clustered index as follows:
CREATE CLUSTERED INDEX [IX_HF1] ON [dbo].[Table1]([Column1],[Column2]) ON [PRIMARY]
and I am querying just on Column2, would it be more efficient and faster, in terms of the query, for me to also have a nonclustered index with just Column2 (as in example below) ?
CREATE INDEX [IX_HF2] ON [dbo].[Table1]([Column2]) ON [PRIMARY]
Thanks,
Jeff
Hi,
I'm running a merge replication on a sql2k machine to 6 sql2k subscribers.
Since a few day's only one of the merge agents fail's with the following error:
The merge process could not retrieve generation information at the 'Subscriber'.
The index entry for row ID was not found in index ID 3, of table 357576312, in database 'PBB006'.
All DBCC CHECKDB command's return 0 errors :confused:
I'm not sure if the table that's referred to in the message is on the distribution side or the subscribers side? A select * from sysobjects where id=357576312 gives different results on both sides . .
Any ideas as to what is causing this error?
Hi everyone,
When we create a clustered index firstly, and then is it advantageous to create another index which is nonclustered ??
In my opinion, yes it is. Because, since we use clustered index first, our rows are sorted and so while using nonclustered index on this data file, finding adress of the record on this sorted data is really easier than finding adress of the record on unsorted data, is not it ??
Thanks
I'm a horrible noob everyone, so my apologies come up front.
I know Oracle allows me to just do an
INSERT INTO table
SELECT column1, column2
FROM table2
But I cannot get this to work in MS SQL 2000. (See question #3)
Here's my script that I'm trying to execute from Enterprise Manager:
From this table:
CREATE TABLE ISIS_DATA
(ISIS_STATUS_ID VARCHAR(15) CONSTRAINT ISIS_DATA_ISIS_ID_PK PRIMARY KEY,
ISIS_NAME VARCHAR(50),
ISIS_CLASS_EXPIR_DAT VARCHAR(20),
ISIS_SEX_BD_CAT_SCHL VARCHAR(20))
Where this is a sample row of data:
A123456789 THOMAS, CHARLES B. 009/11/01 M05/04/511G
I want to run that data through some substrings etc. and dump it into another table like this:
//THIS TABLE WILL BE WHERE WE PUT THE RESULTING DATA FROM
//EXECUTING THE SUBSTRs AND OTHER FUNCTIONS TO PREP THE DATA FOR BASIS.
CREATE TABLE ISIS_DATA_PREP
(ISIS_STATUS_ID VARCHAR(15),
STATUS VARCHAR(5),
STUDENT_ID NUMERIC(15) CONSTRAINT ISIS_DATA_PREP_STUDENT_ID_PK PRIMARY KEY,
LAST_NAME VARCHAR(25),
FIRST_NAME VARCHAR(20),
MID_INIT CHAR(1),
CLASS NUMERIC(2),
EXPIR_DATE VARCHAR(10),
SEX CHAR(1),
BIRTHDAY VARCHAR(10),
CAT NUMERIC(3),
SCHOOL VARCHAR(5))
Using this script so far:
INSERT INTO ISIS_DATA_PREP
SELECT B.STATUS, B.STUDENT_ID, B.LAST_NAME, B.FIRST_NAME, B.MID_INIT,
B.CLASS, B.EXPIR_DATE,
B.SEX, B.BIRTHDAY, B.CAT, B.SCHOOL, A.ISIS_STATUS_ID
FROM ISIS_DATA A,
(SELECT SUBSTRING(ISIS_STATUS_ID, 1, 1) STATUS, SUBSTRING(ISIS_STATUS_ID, 2, 9) STUDENT_ID,
ISIS_NAME LAST_NAME, SUBSTRING(ISIS_NAME, 5, 1) FIRST_NAME, SUBSTRING(ISIS_NAME, 5, 1) MID_INIT,
SUBSTRING(ISIS_CLASS_EXPIR_DAT, 1, 1) CLASS, SUBSTRING(ISIS_CLASS_EXPIR_DAT, 2, 8) EXPIR_DATE,
SUBSTRING(ISIS_SEX_BD_CAT_SCHL, 1,1) SEX, SUBSTRING(ISIS_SEX_BD_CAT_SCHL, 2, 8) BIRTHDAY,
SUBSTRING(ISIS_SEX_BD_CAT_SCHL, 10, 1) CAT, SUBSTRING(ISIS_SEX_BD_CAT_SCHL, 11, 2) SCHOOL,
ISIS_STATUS_ID
FROM ISIS_DATA) B
WHERE A.ISIS_STATUS_ID = B.ISIS_STATUS_ID
I keep getting this error:
Server: Msg 8114, Level 16, State 5, Line 1
Error converting data type varchar to numeric.
QUESTION #1 - Is there an equivalent in MS SQL 2000 to Oracle's TONUM function?
So, to get around this I change all the fields in the receiving table (ISIS_DATA_PREP) to a varchar so there is no conversion necessary at this time.
Now I get this message:
Server: Msg 8152, Level 16, State 9, Line 1
String or binary data would be truncated.
The statement has been terminated.
I look up this error on MS's knowledge base and get something along these lines:
...Because the truncated string is shorter than the maximum length, the char column that does not allow a null value and the char variable is padded with trailing blanks while the varchar column will not store trailing blanks....
QUESTION #2 -
What am I doing wrong on the field structure on the receiving table of the input command? I experimented by setting all fields to VARCHAR(25) so it would accept more data and not truncate, but still get the same message.
QUESTION #3 -
My main question was for the syntax for INSERTing into a table from another table the rows in MS SQL. Basically copying the data. I have it for Oracle, but MS SQL doesn't seem to take it in that format.
Sorry for the absolutely massive post. : ) And thanks for any feedback.
Lance
Hi,
we have records with login.out of employees.
i.e.
this is a set of login/out for an employee for 1 day (but the actual data shows 2 dates )
login 1/1/2005 15:00
logout 1/1/2005 16:00
login 1/1/2005 17:00
logout 1/1/2005 18:00
login 1/1/2005 23:00
logout 1/2/2005 1:00
login 1/2/2005 2:00 <-----------this is the reason why we need a new table called schedules
logout 1/2/2005 3:00 some employee goes over the next day to finish their shift
I think in order to get the proper Start Time and Stop time we need a new table called schedules.
schedules will contain employee work schedules, kindly help me design how to accomplish this.
question is, will it be for each day?
so I'll have 365 record per employee?
help me design the columns
employeeID, startTime,stopTime, workdate -do I need only four?
Thanks.
I'm new to SQL server. I want to add or append a unique set of rows to a destination table from a source table, they are essentially the same table by definition. The source table is updated every hour via DTS, all rows deleted and new set added. Both tables have the same primary key. Approximately 40 unique rows are created each hour and I would think the best approach would be to append the new rows to the destination table. I think an Append query will run into a primary key conflict.
In Access, I did this within VB by checking the max value of the primary key and then running the append for any values greater than that.
In SQL, I'm not sure if this should be done as a stored procedure or if there is an easier approach altogether.
Let's say you have a Users table, which simply contains a collection of people. Each person has attributes like their password, first and last name, username, etc. It would be useful to track changes to that table over time, so that if an entry is changed, you can simply look at a history table and see which changes occured, and when.
An INSERT/UPDATE trigger works well for this sort of thing, where the trigger inserts all of the 'INSERTED' values into a history table that has basically the same table definition as the Users table. But it gets tricky when considering Deletes.
If my History table entries reference back to the User in the Users table, this means that if I ever want to delete the user, I need to delete all their History first. This means I can't keep records of user deletions, which is significant. The other approach is not to have a foreign key reference in the History table, so that if a user is deleted, I can still keep my History about that user. Including deletes.
I have been timid about doing it this way, since I felt it broke the idea of a well structured database. Is there a better way to approach this? Is there a standard way to set up triggered history to track changes, including deletions, from a table?
Thanks,
-Dan
Code Snippet
Hi there,
I'm struggeling for more than a week now with this problem, without a finding the solution.
I have two databases, MS Access and SQL Server 2005 Express Edition
Using a procedure in Visual Studio i would like to copy all the records from one table in MS Access into an existing table in SQL Server (the tables have the same name and the same layout)
I tried to prepare one Dataset to copy from Access into SQL Server but when i run the command 'DaSQL.Update(DsSQL, "Tabella") nothing happens (not even an exeption has been raised), looking during debug, the DataSet seems filled though...
Please could anyone explain what's wrong and / or is there a more quicker way to copy data from a table to another?
Note i woul have as a final goal to get data from an AS400 database by ODBC, manage it, and put it on SQL Server for a 'data mining' scope (eliminating the use of MS Access, not suited for FE-BE).
the procedure goes like this;
' Create a connection to the MS Access Database
Dim connectionToAccess As New OleDbConnection(DBConnectionAccString)
strsql = "SELECT * FROM [TABELLA]"
connectionToAccess.Open()
Dim DaAccess As New OleDbDataAdapter(strsql, connectionToAccess)
Dim DsAccess As New DataSet("ACCESS")
DaAccess.FillSchema(DsAccess, SchemaType.Source, "Tabella")
DaAccess.Fill(DsAccess, "Tabella")
' Create a connection to the SQL Database
Dim connectionToSQL As New SqlConnection(DBConnectionSQLString)
connectionToSQL.Open()
Dim DaSQL As New SqlDataAdapter(strsql, connectionToSQL)
Dim DsSQL As New DataSet("SQL")
DaSQL.FillSchema(DsSQL, SchemaType.Source, "Tabella")
DaSQL.Fill(DsAccess, "Tabella")
DaSQL.Update(DsSQL, "Tabella")
Note I tried also the following, withou a result;
DsSQL = DsAccess.Copy
DaSQL.Update(DsSQL, "Tabella")
Please is there someone who could respond !!???
please explain the differences btween this logical & phisicall operations that we can see therir graphical icons in execution plan tab in Management Studio
thank you in advance
Hi all,
my stored procedure have one table variable (@t_Replenishment_Rpt).I want to create an Index on this table variable.please advise any of them in this loop...
below is my table variable and I need to create 3 indexes on this...
DECLARE @t_Replenishment_Rpt TABLE
(
Item_Nbr varchar(25) NULL,
Item_Desc varchar(255) NULL,
Trx_Date datetime NULL,
Balance int NULL,
Trx_Type char(10) NULL,
Issue_Type char(10) NULL,
Location char(25) NULL,
Min_Stock int NULL,
Order_Qty int NULL,
Unit char(10) NULL,
Issue_Qty int NULL,
Vendor varchar(10) NULL,
WO_Nbr varchar(10) NULL,
Lead_Time int NULL,
PO_Nbr char(10) NULL,
PO_Status char(10) NULL,
Currency char(10) NULL,
Last_Cost money NULL,
Dept_No varchar(20) NULL,
MSDSNbr varchar(10) NULL,
VendorName varchar(50) NULL,
Reviewed varchar(20) NULL
)
I tryed all below senarios...it is giving error...
--Indexing the @t_Replenishment_Rpt table on the column Names Item Number, Vender , Department Number
--EXEC sp_executesql(CREATE UNIQUE CLUSTERED INDEX Replenishment_index ON @t_Replenishment_Rpt (Item_Nbr))
--CREATE UNIQUE CLUSTERED INDEX Idx1 ON @t_Replenishment_Rpt.Item_Nbr
INDEX_COL ( '@t_Replenishment_Rpt' , ind_Replenishment_id , Item_Nbr )
--EXEC sp_executesql('SELECT INDEXPROPERTY('+ '@t_Replenishment_Rpt' + ', ' + 'Item_Nbr' + ',' + 'IsPadIndex' + ')')
--EXEC sp_executesql(SELECT INDEXPROPERTY('@t_Replenishment_Rpt', 'Vendor','IsPadIndex'))
--EXEC sp_executesql(SELECT INDEXPROPERTY('@t_Replenishment_Rpt', 'Dept_No','IsPadIndex'))
Hey,
what is the difference between Table Scan und Index Scan?
I find no difitions in the internet
Finchen
Hi,
I want to know wht is a
TABLE SCAN
INDEX SCAN
INDEX SEEKand When they are used, Wht is the difference between all these.????
I am new to this type of programming and and have read all articles on adding an image to the database and it seems they all use sql queries to add an image but I want to add an image at design time. I am using Visual Basic 2005. I am also using Visual Basic 2005 Express Edition to try the same thing. I am trying to build a Translator program for english to Brazilian Portuguese and the reason I want to add the images is so that when I translate the word cat from english to Portuguese, I can also show an image of a cat. Can anyone please help me
View 3 Replies View RelatedHow to add a index to a table or to multiple tables but there are no primary keys on them
Thanks
Karen
I have setup a DTS job that performs the following steps once a week.
1. Truncate a User Table called Sales
2. Import 750,000 new sales records from a semi-colon delimited text file.
3. Execute an update query that adds a SalesID field to each record. (this is a concatenation of several columns for each record and may not be unique)
This whole process takes about 2 minutes.
Here is my question: all querys and views against this Sales table use the SalesId field to identify a result set. Therefore my thought is that I need Clustered index on the SalesID field in the sales table.
What is the right way to handle this:
1. Leave the table as is and do not add an index to the SalesID field. (All queries would rely on file scan of the table)
2. Add a permenat Index to the SalesID field. Which will probably cause the truncate and Import to run more slowly.
3. Do option 2 but drop the index before truncating the table and add the Index back to the SalesId field as the last step in the DTS job.
Any idea what would provide the best performance? If I missed any options please let me know, thank you for any help!
When do you index a table and when do you not?.
View 1 Replies View RelatedWhen considering locks caused by a table, would it be better to have more rows in a table
than less? For example, I can design the table to hold 1 million rows that have 300,000 rows that are
updated frequently or I can take out 700,000 rows and place them in another table and have
the 300,000 rows that remain take a severe beating. Would I have less locking problems and
deadlocks if I take out the non-updating rows or would it be more likely to deadlock because
of a higher chance of a lock being held on the same page?
Thanks,
Mike
I have a tmp table created as
select row_number() over ( order by duedate) as row ,
duedate as date, ...
into #fronta
from oitb with(nolock)
where ....
order by duedate
The table is filled correctly with about 30k records. Now in next step I want to work with this tmp table I created, but I have problem, when I use query like this
select * from #fronta where row < 500
When the operator is = or <>, the query is quick, but when I use < or >, the query takes about 10 minutes.
I tried to add to this tmp table index on field named row, but with no succes.
Have anyone idea how to improve the speed?
thanks a lot
Vendor software does not supply primary keys on tables
There is a table
EMPLOYEE
Empl_ID This has create unique, and index selected.
As this is unique is this ok to set create as clustered so i get primary key defined.
How to change automatically on all tables that have this set.
Thanks
Hello,
I have a table as so:
ID
Field1
Field2
Field3
My ID field is an identity field (unique). It is the primary key. I also want to add an index/unique key so that a combination of Field1 and Field2 can not be duplicated. How do I do this?
Many thanks in advance!
Mark
Hi I'm issuing a SELECT on a field with the SUM on SQL Server 7. I have an index on the field in the WHERE clause but upon analysis, the Query Optimizer always uses a Full Table Scan. Can anyone explain why and is there a way to use the index.
HEre's the structure:
SELECT SUM(colA)
FROM TABLE tblB
GROUP BY colC
An index exists on column colC.
Thanks
Hi all,
Is it possible to get the name and size of each index in a table? Please let me know.
Thanks in advance,
Praveena
Hi all,
Is it possible to get the name and size of each index in a table? Please let me know. In sql 7, we could do this using EM but, in sql 2000, I'm not sure how to do this.
Thanks in advance,
Praveena
I am creating a table variable (@tblBin) to temporarily store a set of data. Later in my sproc, I am doing a JOIN from @tblBin to a persistent table. In order to improve performance, I was thinking of adding an index to the columns of the @tblBin (indexes already exist on the persistent table). Using standard CREATE INDEX syntax(*), I am getting a compile error. Can this be done?
(*)CREATE NONCLUSTERED INDEX IX_tblBin_shortname ON @tblBin(shortname)
TIA ...
Regards,
~DLDay
I already posted this over on sqlteam so don't peek there if you haven't seen that post yet. :)
So now to the question:
Anyone care to guess how long it took me to build a clustered index on a table with 900 million rows? This is the largest amount of data in a single table I have had to work with thus far in my career! It's sorta fun to work with such large datasets. :)
Some details:
1. running sql 2005 on a dual proc 32bit server, 8gb ram, hyperthreaded, 3ghz clock. disk is a decent SAN, not sure of the specs though.
2. ddl for table:
CREATE TABLE [dbo].[fld](
[id] [bigint] NOT NULL,
[id2] [tinyint] NOT NULL,
[extid] [bigint] NOT NULL,
[dd] [bit] NOT NULL,
[mp] [tinyint] NOT NULL,
[ss] [tinyint] NOT NULL,
[cc] [datetime] NOT NULL,
[ff] [tinyint] NOT NULL,
[mm] [smallint] NOT NULL,
[ds] [smallint] NOT NULL
)
3. ddl for index (this is the only index on the table):
CREATE CLUSTERED INDEX [CIfld]
ON [dbo].[fld]
(
extid asc
)WITH (FILLFACTOR=100, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF)
4. extid column was not sorted to begin with. ordering was completely random.
Note that I have changed the column names, etc, to protect the innocent. I can't go into details about what it's for or I'd be violating NDA type stuff.
I need to read a db Table but sorted by index - is there a generic "select * from tableA sorted by index" where it just uses whatever index it finds (main index) or do i have to name the index?
View 2 Replies View RelatedI have a table that has thousands of rows inserted daily (rows are seldom updated or deleted)
The table is also involved in frequent non-simple select statements. It currently has about a million rows.
Out of the 15 odd columns in the table, I can see about 6 that would benefit being indexed to speed up the select statements.
Before I do this, I was wondering if people think that perhaps I should create an indexed view that all select statements use, rather than adding indexes directly to the table.
Can anyone advise me the performance benefits/disadvantages of indexed views over indexed tables?
Thanks
What is the correct syntax to add an index to a table?
Example: tableA with fieldB- create an index on fieldB
On one of those common interview question lists, there is the question:
How do you know which index a table is using?
The two answers that I've found are:
SELECT * FROM user_constraints
--and
SELECT TableName,IndexName FROM user_constraints
Both of these return the error:
Server: Msg 208, Level 16, State 1, Line 1
Invalid object name 'user_constraints'.
Is this because I'm using the free version of 2000(MSDE)?
If so, what is the right answer for this version?
-Thanks
Hi
i am new to using this sql server 2000....this is a very simple question to all u guys.....i am just in a learning stage...so any help from u guys is really appreciable....
i need to create a table customers with the following columns...
identity column to self-populate as the primary key,
joindate, leavedate, custcode, empID.
This is the one i tried:
create table customers (id int primary key identity (1,1) not null,
joindate smalldatetime null,
leavedate smalldatetime null,
custcode varchar (10) not null,
empid int not null
)
is tht code correct only???
and i also want the below one :
Create indexes on the leavedate, custcode and empid columns.
how to create these indexes???
and wht happens when i create them(like is thr any advantage of creating indexes???)
thanks......
Hi,I've got 2 table variables inside of an SQL 2000 function:@tmpBigList(BItemID, BRank)@tmpSmallList (ItemID, Rank)The following UPDATE statement can run for a long time if @TmpTable1has 500 rows and @TmpTable2 has 35,000 rows.UDPATE @tmpBigListSET BRank = t.RankFROM @tmpBigListJOIN @tmpSmallList t on t.ItemID = BItemIDLooking at the Query Plan, you see that the INNER JOIN Of @tmpBigListto @TmpSmallList results in 500 * 35,000 = 17,500,000 rows beingreturned from @TmpSmallList. That takes a long time.An index would help, but it appears that you can't add an index to atable variable.Changing to a temp table does not work since it's in a function.Thanks,Joe Landes
View 1 Replies View RelatedWe had data in tables for multiple users (Logins) .Each user data is identified by a one column named €œUSER€?. No user has direct access to tables and only through views .we have created views and stored proc .Views will perform DML operations on tables using condition WHERE USER=SUSER_SNAME() (i.e Logged in user).So no point of getting others user data.
Each table has a column USER and we are queering data based on login user .this is the foreign key of USER table. Each view contains user column in where clause .So for every query we are searching all records .instead of that is there any way to get data with out searching all records.
I heard about table Partitioning, index Partitioning, view Partitioning. Are they helpful to boost my query performance?
And also let me know is there any good way of designing apart from above options
In the table that i will insert rows, there are columns:
Col1 Col2 Col3 Col4 Col5
an there's an index for (Col2,Col3,Col4)
So,
Col1 Col2 Col3 Col4 Col5
---------- ------------------- ------------- ---------- -----------------
0 30082006 'TERM1' 1 7
1 30082006 'TERM1' 1 7
this is not allowed because of the index for (Col2,Col3,Col4).Col4 must be different from 1.
I can see only one way to insert into this table..
SELECT @max_col4= max(Col4) FROM TABLEXXX WHERE Col2=30082006 AND Col3='TERM1'
INSERT INTO TABLEA(Col2,Col3,Col4,Col5) VALUES (30082006,'TERM1',(@max_col4+1),7)
this is right with only one client....but if there are more than one,possibly two clients can try to insert to the table.When one of them gets the max_Col4,lets say it got 89.At the same time,another client started the process and it got 89,too..but after the first client inserted the row, then max_Col4 will be 89.However the second client will still try to insert with Col4 as 89......namely, it will boom...
There must be another method to achieve that job..but what is it...???
I wish I could be able to explain my problem....
Thanks in advance..