Result set differences in a SQL Server Compact database PC vs Mobile device
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Interesting problem: I have a SQL Server CE 3.5 database with some data in it. I run a query on the database, using a mobile device and obtain a result set.
This works fine 99% of the time, but on occasion I get records in the database where the query returns an empty result set.
If I take a copy of the same database file from my mobile device and connect to it with Query analyzer, then run the exact same query (as copied/pasted from the debugger), the query returns records. The query itself does a JOIN and GROUP BY on two tables by a referential identity key field.
Now if I make a clone the same records involved via a series of:
INSERT INTO MyTable (EntireFieldListExceptForIDKey)
SELECT
(EntireFieldListExceptForIDKey)
FROM
MyTable
WHERE
IDKey = Original
The query is now able to correctly assemble a result set on the cloned records on the mobile device.
Can anyone explain this, and possibly how to detect/overcome?
sql sql-server-ce
edited Nov 19 at 19:42
marc_s
569k12811001250
asked Nov 19 at 18:16
Dave Monkman
1
add a comment |
up vote
0
down vote
favorite
Interesting problem: I have a SQL Server CE 3.5 database with some data in it. I run a query on the database, using a mobile device and obtain a result set.
This works fine 99% of the time, but on occasion I get records in the database where the query returns an empty result set.
If I take a copy of the same database file from my mobile device and connect to it with Query analyzer, then run the exact same query (as copied/pasted from the debugger), the query returns records. The query itself does a JOIN and GROUP BY on two tables by a referential identity key field.
Now if I make a clone the same records involved via a series of:
INSERT INTO MyTable (EntireFieldListExceptForIDKey)
SELECT
(EntireFieldListExceptForIDKey)
FROM
MyTable
WHERE
IDKey = Original
The query is now able to correctly assemble a result set on the cloned records on the mobile device.
Can anyone explain this, and possibly how to detect/overcome?
sql sql-server-ce
edited Nov 19 at 19:42
marc_s
569k12811001250
asked Nov 19 at 18:16
Dave Monkman
1
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
Interesting problem: I have a SQL Server CE 3.5 database with some data in it. I run a query on the database, using a mobile device and obtain a result set.
This works fine 99% of the time, but on occasion I get records in the database where the query returns an empty result set.
If I take a copy of the same database file from my mobile device and connect to it with Query analyzer, then run the exact same query (as copied/pasted from the debugger), the query returns records. The query itself does a JOIN and GROUP BY on two tables by a referential identity key field.
Now if I make a clone the same records involved via a series of:
INSERT INTO MyTable (EntireFieldListExceptForIDKey)
SELECT
(EntireFieldListExceptForIDKey)
FROM
MyTable
WHERE
IDKey = Original
The query is now able to correctly assemble a result set on the cloned records on the mobile device.
Can anyone explain this, and possibly how to detect/overcome?
sql sql-server-ce
edited Nov 19 at 19:42
marc_s
569k12811001250
asked Nov 19 at 18:16
Dave Monkman
1
Interesting problem: I have a SQL Server CE 3.5 database with some data in it. I run a query on the database, using a mobile device and obtain a result set.
This works fine 99% of the time, but on occasion I get records in the database where the query returns an empty result set.
If I take a copy of the same database file from my mobile device and connect to it with Query analyzer, then run the exact same query (as copied/pasted from the debugger), the query returns records. The query itself does a JOIN and GROUP BY on two tables by a referential identity key field.
Now if I make a clone the same records involved via a series of:
INSERT INTO MyTable (EntireFieldListExceptForIDKey)
SELECT
(EntireFieldListExceptForIDKey)
FROM
MyTable
WHERE
IDKey = Original
The query is now able to correctly assemble a result set on the cloned records on the mobile device.
Can anyone explain this, and possibly how to detect/overcome?
sql sql-server-ce
sql sql-server-ce
edited Nov 19 at 19:42
marc_s
569k12811001250
asked Nov 19 at 18:16
Dave Monkman
1
edited Nov 19 at 19:42
marc_s
569k12811001250
asked Nov 19 at 18:16
Dave Monkman
1
edited Nov 19 at 19:42
marc_s
569k12811001250
edited Nov 19 at 19:42
marc_s
569k12811001250
edited Nov 19 at 19:42
marc_s
569k12811001250
569k12811001250
asked Nov 19 at 18:16
Dave Monkman
1
asked Nov 19 at 18:16
Dave Monkman
1
asked Nov 19 at 18:16
Dave Monkman
1
1
add a comment |
add a comment |
1 Answer
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This is most likely due to a corrupt index, as both copying the file to your desktop and creating a new table will cause an Index rebuild.
It is recommended to regularly Compact your database to prevent this - also make sure you are using the latest runtime binaries.
answered Nov 19 at 19:13
ErikEJ
30.9k24884
k gotcha, I open with a shrink, which I had assumed was sufficient.
– Dave Monkman
Nov 19 at 19:30
add a comment |
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1 Answer
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1 Answer
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active
oldest
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active
oldest
votes
active
oldest
votes
up vote
0
down vote
This is most likely due to a corrupt index, as both copying the file to your desktop and creating a new table will cause an Index rebuild.
It is recommended to regularly Compact your database to prevent this - also make sure you are using the latest runtime binaries.
answered Nov 19 at 19:13
ErikEJ
30.9k24884
k gotcha, I open with a shrink, which I had assumed was sufficient.
– Dave Monkman
Nov 19 at 19:30
add a comment |
up vote
0
down vote
This is most likely due to a corrupt index, as both copying the file to your desktop and creating a new table will cause an Index rebuild.
It is recommended to regularly Compact your database to prevent this - also make sure you are using the latest runtime binaries.
answered Nov 19 at 19:13
ErikEJ
30.9k24884
k gotcha, I open with a shrink, which I had assumed was sufficient.
– Dave Monkman
Nov 19 at 19:30
add a comment |
up vote
0
down vote
up vote
0
down vote
This is most likely due to a corrupt index, as both copying the file to your desktop and creating a new table will cause an Index rebuild.
It is recommended to regularly Compact your database to prevent this - also make sure you are using the latest runtime binaries.
answered Nov 19 at 19:13
ErikEJ
30.9k24884
This is most likely due to a corrupt index, as both copying the file to your desktop and creating a new table will cause an Index rebuild.
It is recommended to regularly Compact your database to prevent this - also make sure you are using the latest runtime binaries.
answered Nov 19 at 19:13
ErikEJ
30.9k24884
answered Nov 19 at 19:13
ErikEJ
30.9k24884
answered Nov 19 at 19:13
ErikEJ
30.9k24884
answered Nov 19 at 19:13
ErikEJ
30.9k24884
30.9k24884
k gotcha, I open with a shrink, which I had assumed was sufficient.
– Dave Monkman
Nov 19 at 19:30
add a comment |
k gotcha, I open with a shrink, which I had assumed was sufficient.
– Dave Monkman
Nov 19 at 19:30
k gotcha, I open with a shrink, which I had assumed was sufficient.
– Dave Monkman
Nov 19 at 19:30
k gotcha, I open with a shrink, which I had assumed was sufficient.
– Dave Monkman
Nov 19 at 19:30
add a comment |
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