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21
votes
5answers
55k views

How to insert (file) data into a PostgreSQL bytea column?

This question is not about bytea v. oid v. blobs v. large objects, etc. I have a table containing a primary key integer field and a bytea field. I'd like to enter data into the bytea field. This ...
6
votes
4answers
3k views

Do I really need to keep .LDF files?

Each month we make an end of month snapshot of our production databse. These month end snapshots are strictly for reporting purposes, there are no inserts, updates or deletes ever done on them. Each ...
6
votes
1answer
7k views

Identify File Growth Events

I'm discovering a number of DBs in my portfolio that have been created with default autogrow settings (either 1 MB or 10% increments) that have expanded for an extended period of time. If I wanted to ...
5
votes
1answer
135 views

Find what data is placed in a datafile

I have a database with 5 .ndf (secondary) datafiles on SQL Server 2008 R2. (Each of these datafiles is assigned to a separate filegroup.) I want to know what data is there in those files. Is it ...
5
votes
2answers
2k views

Multiple SQL Server data files on same SAN disk

I'm currently in the process of creating a new database, and have previously only ever used a single data file and a single log file. I've done some research online regarding the benefits of multiple ...
5
votes
1answer
51 views

Why isn't transaction log free space always reused?

After monitoring the Transaction log files for a while I noticed that some of them sometimes behave in a way I did not expect. Here are two samples for comparison. All data is based on EXEC('DBCC ...
4
votes
4answers
14k views

What's better/faster? MySql or FileSystem?

Let's imagine a web site that is a directory of people. For each person there may be a profile photo and a biography. I'll admit my SQL queries could be better but in general what would be faster and ...
4
votes
2answers
6k views

Removing secondary data files. DBCC SHRINKFILE: Page could not be moved because it is a work table page

I have too many secondary data files (.ndf) created for tempdb. To remove the excess files, I need to empty the file (content will be moved to other files): DBCC SHRINKFILE('tempdbfile8', EMPTYFILE); ...
4
votes
1answer
605 views

Repair SQL Server Database [closed]

Can anyone give me a complete guide to verifying/repairing a SQL Server database? At the moment our backup is failing on the Solarwinds database saying the database NetPerfMon is corrupted (we are ...
4
votes
2answers
3k views

Splitting a large SQL Server MDF file

I have a large (1.2 terabyte) SQL Server database that I need to migrate to a new server. Most of the database lives on a single, 1.25 TB data file, and a little bit sits on a much-more-manageable 550 ...
4
votes
2answers
6k views

Shrinking the SYSTEM tablespace in Oracle

Our SYSTEM tablespace grew out of control because of the SYS.AUD$ table. We have truncated SYS.AUD$ but the datafile is still very big (~30G). Resize doesn't work because the file contains used data ...
3
votes
6answers
11k views

SQL Server split mdf into multiple files

I have a database called example.mdf with a total size of 1GB which suffers from performance issues. I checked the allocated hardware and it is higher than required, I double checked the design and ...
3
votes
2answers
7k views

Disk space full but logical space available in database

We have a fairly big MS SQL 2008R2 database that resides on a SSD drive. The drive itself only has ~110Gb of space, and the database files are the only files on the drive. The database is in "Simple" ...
3
votes
1answer
193 views

Difference in space used

When reviewing the space used by datafiles in SQL Server, there is a large difference betweens what SQL reports and Windows. How can this be explained?
3
votes
2answers
1k views

Autogrow. Primary vs additional data files

My databases all use autogrow, which grows the primary MDF file on a percentage. But one of the databases, from a third party application grows by adding additional .NDF files. Where is this option ...
3
votes
1answer
547 views

Tempdb data file disappearing

I recently moved my Temp database files onto a separate drive (I had two data files and one log file). However, after restarting the server, my second data file disappeared both from the file list on ...
3
votes
1answer
401 views

MariaDB ALTER TABLE produced a separate .ibd file, how can I re-integrate the data into the shared table space?

We have a multi-GB InnoDB MariaDB (recently switched from MySQL). For some reason, the value of innodb_file_per_table changed to ON (we wanted only one innodb data file explicitely). So when I ran an ...
3
votes
1answer
130 views

Should I align my SQL Server file and growth sizes with the block sizes on my SAN?

It was brought to my attention that our (Hitachi) SAN handles data in 42MB blocks. It is tiered storage so each block is evaluated when the director makes decisions as to when it should promote/demote ...
2
votes
1answer
1k views

Are multiple dbf files better than one?

Is it better to distribute a large database over several dbf files than over a single one?
2
votes
2answers
508 views

where is the index physically located in MySQL database

Just wondering where is the index info physically located in MySQL database if I have indexed a table with ALTER TABLE contacts ADD KEY (columnName); ? it will stay with that table and add a new ...
2
votes
1answer
190 views

SQL Server data files and RAID

I have a server with a RAID1 volume (OS + apps) and a RAID10 volume (database). The RAID10 volume has 6 physical disks. Should I split the SQL Server database into 6 datafiles (one for each physical ...
2
votes
1answer
305 views

Restore InnoDB tables / database using only data files

I have MySQL Server 5.1.51 installed on Windows Server 2003 as Operating System and using InnoDB as database engine. I have run DROP DATABASE dbName statement by mistake. I have no backup of that ...
2
votes
1answer
42 views

Pausing the import of an SQL file in Postgresql?

I am currently importing a large database (6 - 7 GB's) into my postgresql on Ubuntu. It's taking sometime to do. A problem has come up where I need to physically relocate the laptop the postgresql is ...
2
votes
1answer
127 views

How does subpartitioning actually work and what physical files are created?

I can't understand how the subpartitioning works in mysql. I am reading the following example: create table invoices ( customer_id int not null, product_id int not null, amount decimal ...
2
votes
2answers
850 views

Detached database file permissions

I have a script that detaches databases for archival when they meet certain criteria. The script is executed by SSIS under the local Administrator account by the Ghost of DBA Past. Per design it (by ...
2
votes
1answer
69 views

Adding specific information to a local file

I have several files on a webserver (not stored in the database). I'd like to store several information to this specific file. The user should be able to post comments about this file. My question ...
2
votes
0answers
127 views

SQL Server 2008 R2 - Two Files Stuck In Restoring Status

Background: SQL Server 2008 R2 mirrored and clustered. We recently failed over the databases via mirror and everything went smoothly. When it was time to do a differential backup, I got an error so I ...
2
votes
1answer
57 views

Database Size Troubleshooting

I have a SQL Server database and the .MDF file is almost 9GB in size. However, the data and indexes only seem to be taking up a little over 1GB. I've shrunk the database (with and without ...
1
vote
2answers
2k views

Oracle datafile extension .dat or .dbf

I have seen these 2 extensions used for datafiles, .dat and .dbf while creating and/or altering a tablespace. I'm not sure what the difference between the 2 extensions is, or if .dat is incorrect. ...
1
vote
1answer
184 views

Should database files be on different disk(s) than OS?

My very short overview SQL Server databases are installed as virtual machines on VMWare, there are plugged a few disk areas with the same (or very similair) parameters versions are SQL Server ...
1
vote
1answer
111 views

'Logical file name “MyDB” is already in use' Even though the database doesn't exist [closed]

I recently was given a SAN with a couple of RAID arrays to apply to my database server to increase performance. I have (and will only ever have) one user database called DDAS, in addition to the ...
1
vote
1answer
44 views

Post data deploy in SSDT

I need to create post deployment script which will upload data from .csv file to my database. But I can't understand how can I do this. When I tried to deploy my project on my server I receive this ...
1
vote
1answer
10k views

How to export an image column to files in SQL Server?

I will migrate from a database. There is one column of type image that I would like to export to binary files on the file system. One file for each record. How can I do this with SQL Server?
1
vote
1answer
79 views

1 time shrink of abused databse or restore from backup [duplicate]

I have a database that I have inherited which has been left for a long time to grow and grow. 95% of this growth is caused by 1 log table used by our application. The database is 120GB and in full ...
1
vote
1answer
471 views

file not found - how to remove its configuration?

I run oracle 10.2.0.5. I have the following: SQL> select file#, status, error, recover, tablespace_name, name 2 from v$datafile_header 3 where recover='YES' 4 or (RECOVER IS NULL AND ...
1
vote
1answer
29 views

Storing blobs outside the database

I had a PostgreSQL database with loads of scanned documents, as a document bytea column in the table scans, with hundreds of thousands of documents that was large and inconvenient to backup. Also, ...
1
vote
2answers
21 views

How to get readonly access to mysql files via g+w permission 750 or 640?

The data-dir itself has permissions 700 thereby limiting access to the mysql user. I want other folks who I add to the mysql group to be able to read binlogs and download the *.frm, *.MYI, *.MYD ...
1
vote
1answer
162 views

Reclaiming unused space from datafile in oracle

Tablespace Used MB Free MB Total MB ------------------------------ ---------- ---------- ---------- DATA_S1 686 295 981 We ...
1
vote
4answers
434 views

Script to merge-replicate two MDF database files?

I have a program on a computer and on a tablet. The program uses SQL Server Express to interact with a local database (the same information on both) from a .MDF file. So if I plug the tablet into the ...
1
vote
1answer
352 views

How can I set block size on Oracle 11 when creating a database instance

Is there any way to configure Oracle 11g's default block size on installation? I have tried Oracle 11g r2 and r3, during both installations block size is 8k and it is disabled (and can not be ...
1
vote
1answer
702 views

How many files should I create for one filegroup and 9 weekly partitions?

I have 9 weekly partitions on one filegroup. How many files do I need to create? There are 3 tables containing 46 million, 16 million and 10 million rows.
1
vote
1answer
120 views

MySQL Data Files Missing?

We are upgrading our website and I was checking on the size of the new database compared to the old one and was really surprised to find that in the /var/lib/mysql/ directory, the only files there ...
1
vote
0answers
51 views

Is there a program I can use to redistribute DB files across multiple volumes efficiently?

I'm working with a VLDB instance with over 60 DBs and close to 200 DB files, allocated over nearly 20 volumes. The instance is a Dev server getting periodic restores from a production instance with a ...
1
vote
1answer
2k views

RMAN rename datafile created in an archivelog

I'm trying to restore an Oracle database (11.2.0.4.0) to a test system with a different file layout. The production database is being backed up using RMAN, no catalog. We do a full backup of all the ...
0
votes
1answer
78 views

Are databases only growing in size?

Databases use the file system to store the data. As far as I know it is not possible to delete a record from a random access file. So does that mean that when we do a DELETE FROM TABLE the size of the ...
0
votes
1answer
495 views

How to copy tablespace from one database to another database in Oracle 11g

How to copy tablespace and datafiles from one database to another database in Oracle 11g in same server ?
0
votes
2answers
291 views

Discover the original OS of a datafile from a oracle backup

I have just been awarded with the task of recovering a oracle database with some given datafiles. However, nobody knows from which OS this backup comes from. I have an AIX box to make the recover. Is ...
0
votes
2answers
112 views

Where/how does innodb store tables in files?

I read somewhere that InnoDB can store all the tables in a single file or in separate files. Is this a configuration option? What is the default setting? A file for all tables or a file per table? ...
0
votes
1answer
2k views

Why is MySQL database data-files deployed under /var/lib/mysql?

I was wondering why do we deploy data files under /var/lib/mysql/. Is there a logical reason for that, or is that just a "traditional" place for the data? I will value more answers based on standards ...
0
votes
2answers
314 views

Drop datafile without dropping a tablespace in Oracle 11g

I was trying to take backup of database in Oracle 11g by using RMAN $ rman target / Recovery Manager: Release 11.2.0.1.0 - Production on Fri Sep 11 10:14:37 2015 Copyright (c) 1982, ...