A database structure that can improve the speed of queries at the cost of disk space and slower inserts/updates. It stores a copy of one or more columns but structures the data differently to allow for faster access.
0
votes
0answers
6 views
SQL Server: Sync Indexes between two tables within Same database
I need to automate and Sync only indexes between two tables ( Primary and Stage_Table) within same database.
Tried using SSIS SQL Server Objects Task, but looks like it works only when we sync between ...
2
votes
1answer
43 views
SQl server indexes file damaged, was on ramdisk!
I have put some of my indexes into a file-group that contains one file, that file is on the ramdisk, the performance goes fire!! but the problem is that the file has deleted by wrong (The file ...
0
votes
1answer
22 views
Which text-index I should create for xooops engine to achieve better search results?
In one of projects we use xoops engine to manage content. In mysql slow query log most of queries are following :
SELECT p.uid,f.forum_id, p.topic_id, p.poster_name, p.post_time, f.forum_name, ...
0
votes
3answers
16 views
Mysql - How to optimize retrival time in a table
I have query like this! which has 200 million Records in a single table.. I am using BTree Indexes in my table...
mysql> select COUNT(DISTINCT id) from [tablename] where [columname] >=3;
...
2
votes
0answers
73 views
Why does CREATE INDEX … WITH ONLINE=ON block access to the table over a period of minutes?
I have an existing table:
CREATE TABLE dbo.ProofDetails
(
ProofDetailsID int NOT NULL
CONSTRAINT PK_ProofDetails
PRIMARY KEY CLUSTERED IDENTITY(1,1),
ProofID int NULL,
...
2
votes
2answers
101 views
Can I use a foreign key index as a shortcut to getting a row count in an INNODB table?
I have a table that has a large number of rows in it.
The primary key (an auto-incrementing integer) is, by default, indexed.
While waiting for a row count to be returned I did an EXPLAIN in another ...
0
votes
1answer
64 views
Mysql. Block/disconnect slow queries
I am experiencing issue.
Someone 'attacked' my server: simply by searching the same phrase with multiple requests.
As it is text search request and database indices are not used, the engine searches ...
6
votes
1answer
69 views
Minimizing Indexed Reads with Complex Criteria
I'm optimizing a Firebird 2.5 database of work tickets. They're stored in a table declared as such:
CREATE TABLE TICKETS (
TICKET_ID id PRIMARY KEY,
JOB_ID id,
ACTION_ID id,
STATUS str256 ...
1
vote
2answers
16 views
Why PostreSQL 9.2 does not use index scan if it can?
My PosgreSQL planner (9.2) does not pick index and rather choose to do seq scan.
Here is my table. The index I am talking about is name_left_prefix
cwu=# \d web_city;
...
1
vote
1answer
24 views
Rebuilding Unique Index with uniqueidentifier in SQL Azure never succeeds
We have a number of tables (~1M records) that have a column on them defined as: [GlobalID] [uniqueidentifier] NOT NULL that gets auto-populated with newid(). We use this ID for synchronizing data ...
6
votes
1answer
164 views
Landed as BI, but databases are a big WTF, what to do?
Maybe a duplicate, but I believe my case is a bit different. From one of the answers I got to this post on SQL Server Central that also comes handy too but is not quite the same scenario: 9 Things to ...
0
votes
0answers
13 views
MySQL (v5.6.11) InnoDB 5.6.11 restoring indexes during table copy
When i see the profile for my optimize table query here is what i see for the InnoDB storage engine 5.6.11:
+----------------------+------------+
| Status | Duration |
...
0
votes
2answers
76 views
How do you correct a corrupted index in Oracle?
I have this ORA error in our logs:
Caused by: java.sql.BatchUpdateException: ORA-01578: ORACLE data block corrupted (file # 8, block # 22921) ORA-01110: data file 8: ...
4
votes
3answers
105 views
Index before or after bulk load using load infile?
I have a database with over 1B rows and two columns that are indexed (in addition to the PK).
Is it better to have the index pre-defined in the table before the load infile or better to index after ...
0
votes
1answer
47 views
How do you correct a corrupted index in Oracle? [duplicate]
I have this ORA error in our logs:
Caused by: java.sql.BatchUpdateException: ORA-01578: ORACLE data block corrupted (file # 8, block # 22921)
ORA-01110: data file 8: ...
