How to drop all tables in mysql database using a single command

Command:-
mysqldump -u[user] -p[password] --add-drop-table --no-data [DATABASE] | grep ^DROP | mysql -u[user] -p[password] [DATABASE]

Here test is the database name. I'm going to drop all the tables from this database.
Example:-
mysqldump -uroot -predhat --add-drop-table --no-data test | grep ^DROP | mysql -uroot -predhat test

Know How To Resolve SQL Server Error 3271?

When a user is backing up a database or restoration procedure is in process, most of the SQL users faces an error i.e. SQL error 3271. This a type of error encounters when a system is performing an I/O operation.

The main reason behind this error message is related to I/O operation that displays a message of nonrecoverable I/O error. Therefore, in this article, we have discussed the all the major causes of occurrence of this error and what all are the possible solution to fix this error.

Causes of Microsoft SQL Server Error 3271

There are various major causes that are responsible for this error. Therefore, in this section, all the major reasons of occurrence of this error are discussed:

  • Lack of Storage Space
  • The error occurs mainly because of unavailability of space in the storage media. Therefore, it is impossible to fit backup created on the disk. This error message also has some additional text that determines the storage device memory is full, which leads to this I/O error like:

    “A nonrecoverable I/O error occurred on file ‘%ab:’ %ab”

  • VSS Writer of SQL Server
  • The another major reason of the error is an issue with VSS. Volume Shadow Copy Snapshot (VSS) is a replica that is backed up via Window server. Therefore, it can also be possible that an error encountered due to any of the VSS writer that results in failure of the backup operation and further leads to entire backup process failure. Moreover, any error any problem, which is created by VSS writer results an SQL server error 3271.

  • SQL Database Corruption
  • One of the reasons that cause the error is corruption in the SQL database for which user was trying to create a backup. If the user tries to backup the corrupted SQL database then it is more likely to be possible that an I/O error occurs that further leads to error 3271.

A user must run a check through the SQL error logs to determine the exact reason of the error. After identifying the exact reason, a correct measure or solution can be used to fix the error message and prevent the SQL database from this error in future.

How To Fix SQL Server Error 3271?

If the reason of the error message is one of the above mentioned, then a user must follow the measures discussed below:

  • Increase Space On Disk
    1. If the reason of the error is a lack of storage space, then first, a user needs to check the amount of storage space available on the disk on which backup needs to be created.
    2. If there is no space available, first a user needs to free up some space on the storage disk or can use some external storage to save the created backup.
  • Resolve VSS Writer Issue
    1. If the reason of Microsoft SQL error 3271 is VSS writer then, a user must review the instances by running the SQL instance check because the error is due to problematic SQL instance that prevents from taking a snapshot of the database.
    2. After identifying the instance, a user needs to stop that instance and run the backup process without that instance.
    3. If the backup process is completed successfully then it is clear that this particular instance is responsible the error. A user can again check SQL error log to determines the reason behind the inappropriate functionality of that particular instance.
    4. If the user is not able to identify the instance that causing problem on a server, then one needs to stop all the instances on the server to run the backup process.

Note: When you stop all the available instances then, always keep in mind SQL VSS writer is not in use while taking backup.

With the help of these above mentioned manual procedures, a user is able to avoid and fix the error and run the backup process successfully.

Conclusion

While taking backup of SQL database, a user faces an I/O error generally known as Microsoft SQL Server error 3271. Therefore, all the causes of this error need to determined first, then depending upon the cause of error a respective measure should be taken to resolve it. Hence, in this post manual solutions to resolve these issues are discussed with respect to the cause of the error that a user can use to overcome this issue. However, if the error message occurs while restoring backup then there may be possibility of backup file corruption. In such situation you can take the help of third party SQL backup recovery tool to repair corrupt SQL backup file and fix the error message.

Steps to Rename Physical Database Files in SQL Server

The users can manually rename the physical files according to choice using the Transact-SQL commands in the following manner:

Firstly, we will create a database “new_db” using SQL query. Naturally, the physical files will be named as “new_db.mdf”. Our main aim is to rename SQL Server physical files from “new_db.mdf” to “old_db.mdf”. Follow the below mentioned steps to manually rename the files:

  1. Firstly, run the following command to create a new database with name ”new_db”.
  2. CREATE DATABASE [new_db]
    CONTAINMENT = NONE
    ON PRIMARY
    ( NAME = 'name', FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\new_db.mdf',SIZE = 5MB , MAXSIZE = UNLIMITED, FILEGROWTH = 10MB )

    Thus, a new database is created with physical file “new_db”. The following steps can be used to rename SQL Server physical files name.

  3. Now, locate the physical location of file on your system using the following command:
  4. USE new_db
    GO
    SELECT file_id, name as [logical_file_name], physical_name
    FROM sys.database_files
  5. Also, the database should be brought to OFFLINE state because the files cannot be renamed in the online mode. Run the following command to bring database to offline state:
  6. USE [master];
    GO
    --Disconnect all existing session.
    ALTER DATABASE new_db SET SINGLE_USER WITH ROLLBACK IMMEDIATE
    GO
    --Change database in to OFFLINE mode.
    ALTER DATABASE new_db SET OFFLINE
  7. Since the database is offline now, so browse to the location of the file as found from Step(1). Rename the file to desired name e.g., old_db.mdf.
  8. Now, update the system catalog for updating the new name of the physical file.
  9. ALTER DATABASE new_db MODIFY FILE (Name='new_db', FILENAME='C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\old_db.mdf') GO

    This updates the physical file name in system catalog file.

  10. Run the following command to bring the database in ONLINE mode:
  11. ALTER DATABASE new_db SET ONLINE
    Go
    ALTER DATABASE new_db SET MULTI_USER
    Go

    So, the database physical file name has been renamed to “old_db.mdf” and the database is also in the Online mode. The users can now work normally on the database to perform any operation.

Conclusion

The user may feel it necessary to rename physical file name in SQL Server due to any reason. However, to avoid confusion between the physical files and database, the users are always advised to rename SQL Server physical database files using T-SQL. All the detailed steps have been mentioned in the above section.

Queries regarding Mysql Proceduers


To find out all the procedures of a database:-

SHOW PROCEDURE STATUS WHERE Db = 'thirstydb';


To set a new definer:-
mysql> UPDATE `mysql`.`proc` p SET definer = 'thirstydev@%' WHERE definer='thirstylive@localhost' AND db='devthirstydb';
Query OK, 0 rows affected (0.02 sec)
Rows matched: 0  Changed: 0  Warnings: 0

mysql> UPDATE `mysql`.`proc` p SET definer = 'thirstydev@%' WHERE definer='thirstylive@%' AND db='devthirstydb';
Query OK, 85 rows affected (0.04 sec)
Rows matched: 85  Changed: 85  Warnings: 0

To select all the procdure of a particular db:-
select name FROM mysql.proc WHERE db = 'devthirstydb' AND type = 'PROCEDURE';

select name FROM mysql.proc WHERE db = 'devthirstydb' AND type = 'FUNCTION';


To delete all the procdure of a particular db:-
DELETE FROM mysql.proc WHERE db = 'devthirstydb' AND type = 'PROCEDURE';

DELETE FROM mysql.proc WHERE db = 'devthirstydb' AND type = 'FUNCTION';




Mysql procedures:-

To find out all the procedures:-

mysql> show procedure status;
+--------------+---------------------------------------+-----------+---------------+---------------------+---------------------+---------------+---------+----------------------+----------------------+--------------------+
| Db           | Name                                  | Type      | Definer       | Modified            | Created             | Security_type | Comment | character_set_client | collation_connection | Database Collation |
+--------------+---------------------------------------+-----------+---------------+---------------------+---------------------+---------------+---------+----------------------+----------------------+--------------------+
| thirstydb    | advanced_vendor_filtering             | PROCEDURE | thirstylive@% | 2016-08-12 05:13:27 | 2016-08-12 05:13:27 | DEFINER       |         | utf8                 | utf8_general_ci      | latin1_swedish_ci  |
| thirstydb    | advanced_vendor_filtering_my_bookings | PROCEDURE | thirstylive@% | 2016-08-12 05:22:29 | 2016-08-12 05:22:29 | DEFINER       |         | utf8                 | utf8_general_ci      | latin1_swedish_ci  |
| thirstydb    | advanced_vendor_filtering_temp        | PROCEDURE | thirstylive@% | 2016-08-08 08:29:11 | 2016-08-08 08:29:11 | DEFINER       |         | utf8                 | utf8_general_ci      | latin1_swedish_ci  |
| thirstydb    | all_food_categories                   | PROCEDURE | thirstylive@% | 2016-08-08 08:29:20 | 2016-08-08 08:29:20 | DEFINER       |         | utf8                 | utf8_general_ci      | latin1_swedish_ci  |
| thirstydb    | apikeyValidity                        | PROCEDURE | thirstylive@% | 2016-08-08 08:29:29 | 2016-08-08 08:29:29 | DEFINER       |         | utf8                 | utf8_general_ci      | latin1_swedish_ci  |
| thirstydb    | apikeyValidity_vendor                 | PROCEDURE | thirstylive@% | 2016-08-08 08:29:41 | 2016-08-08 08:29:41 | DEFINER       |         | utf8                 | utf8_general_ci      | latin1_swedish_ci  |
| thirstydb    | directory                             | PROCEDURE | thirstylive@% | 2016-08-19 03:00:51 | 2016-08-19 03:00:51 | DEFINER       |         | utf8


To find out a procedure by a certain definer name and dbname:-
mysq> use mysql
mysql> select name from  proc where definer = 'thirstydev@%' AND db='devthirstydb';

+---------------------------------------+
| name                                  |
+---------------------------------------+
| advanced_vendor_filtering             |
| advanced_vendor_filtering_my_bookings |
| advanced_vendor_filtering_temp        |
| all_food_categories                   |
| apikeyValidity                        |
| apikeyValidity_vendor                 |
| base_url                              |
| directory                             |
| facebook_login  


To call a procedure:-
mysql> call search_result(1);
Empty set (0.02 sec)

Query OK, 0 rows affected (0.02 sec)


To view a procedure:-

mysql> show create procedure user_login;
+------------+----------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+--------------------+
| Procedure  | sql_mode | Create Procedure                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | character_set_client | collation_connection | Database Collation |
+------------+----------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+----------------------+--------------------+
| user_login |          | CREATE DEFINER=`thirstylive`@`%` PROCEDURE `user_login`(email_in VARCHAR(255), password_in VARCHAR(255),
api_key_in VARCHAR(50), base_url_in TEXT)
BEGIN

        DECLARE email_verified_declared INT(2);
        DECLARE user_id_declared BIGINT;

        SELECT email_verified INTO email_verified_declared FROM user_profile WHERE email = email_in AND `password` = password_in;
        SELECT user_id INTO user_id_declared FROM user_profile WHERE email = email_in AND `password` = password_in;

        IF email_verified_declared = 0 THEN

                SELECT 'unverified_email' AS  col_name;

        ELSEIF user_id_declared IS NULL THEN

                SELECT 'invalid_credentials' AS col_name;

        ELSE

                UPDATE user_profile SET api_key = api_key_in WHERE user_id = user_id_declared;
                CALL user_profile(user_id_declared, base_url_in);

        END IF;


END | utf8                 | utf8_general_ci      | latin1_swedish_ci  |
+------------+----------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+----------------------+-------------------

How to find out highest table size in sql server 2014 ?

SELECT
    t.NAME AS TableName,
    i.name as indexName,
    sum(p.rows) as RowCounts,
    sum(a.total_pages) as TotalPages,
    sum(a.used_pages) as UsedPages,
    sum(a.data_pages) as DataPages,
    (sum(a.total_pages) * 8) / 1024 as TotalSpaceMB,
    (sum(a.used_pages) * 8) / 1024 as UsedSpaceMB,
    (sum(a.data_pages) * 8) / 1024 as DataSpaceMB
FROM
    sys.tables t
INNER JOIN    
    sys.indexes i ON t.OBJECT_ID = i.object_id
INNER JOIN
    sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id
INNER JOIN
    sys.allocation_units a ON p.partition_id = a.container_id
WHERE
    t.NAME NOT LIKE 'dt%' AND
    i.OBJECT_ID > 255 AND  
    i.index_id <= 1
GROUP BY
    t.NAME, i.object_id, i.index_id, i.name
ORDER BY
    TotalSpaceMB desc

Mysql error-log monitoring using Shell script with mail alert

#!/bin/bash
SERNAME=xyz.kmi.com
SERPUBIP=192.168.72.50
SERVER=`hostname`
WEEKDAY=`date '+%w%H%M'`
DATE_VAR=`date '+%Y_%m_%d'`

Error_log_loc=/var/log
egrep 'Error' $Error_log_loc/mysqld.log |sort -u > $Error_log_loc/mysqld_ALERTLOG.txt
cat $Error_log_loc/mysqld.log >> $Error_log_loc/mysqld_archived.log

cat /dev/null > $Error_log_loc/mysqld.log

if [ -s "$Error_log_loc/mysqld.log" ] ; then
cat $Error_log_loc/mysqld_ALERTLOG.txt | mail -s "URGENT -ERROR in Oracle Alert Log File for $SERNAME ($SERPUBIP) at `date` " ssdas@gmail.com
fi

# Weekly alert log datestamp and compress (Sunday 00:15)

sysdate=`date | awk '{ print $3}'`
if [[ $sysdate -eq 4 || $sysdate -eq 11 || $sysdate -eq 18 || $sysdate -eq 25 ]] ; then
mv $Error_log_loc/mysqld_archived.log $Error_log_loc/mysqld_archived_ALERTLOG_${DATE_VAR}.log
gzip $Error_log_loc/mysqld_archived_ALERTLOG_${DATE_VAR}.log
fi
exit 0

Batch script to take database users backup in sql server

SQL Server Version:- SQL 2014

Create a batch file which will be scheduled on task scheduler.

set backuplogfilename=%date:~-7,2%-%date:~-10,2%-%date:~-4,4%-0%time:~1,1%%time:~3,2%%time:~6,2%
SQLCMD.EXE -S localhost -U sa -P "sa@123" -i "E:\users.sql"  >> "E:\users_%backuplogfilename%.log"
-- save and exit

Now schedule the above .bat file in task scheduler


Create a sql file lets say users.sql
Content of users.sql

USE master
GO
IF OBJECT_ID ('sp_hexadecimal') IS NOT NULL
  DROP PROCEDURE sp_hexadecimal
GO
CREATE PROCEDURE sp_hexadecimal
    @binvalue varbinary(256),
    @hexvalue varchar (514) OUTPUT
AS
DECLARE @charvalue varchar (514)
DECLARE @i int
DECLARE @length int
DECLARE @hexstring char(16)
SELECT @charvalue = '0x'
SELECT @i = 1
SELECT @length = DATALENGTH (@binvalue)
SELECT @hexstring = '0123456789ABCDEF'
WHILE (@i <= @length)
BEGIN
  DECLARE @tempint int
  DECLARE @firstint int
  DECLARE @secondint int
  SELECT @tempint = CONVERT(int, SUBSTRING(@binvalue,@i,1))
  SELECT @firstint = FLOOR(@tempint/16)
  SELECT @secondint = @tempint - (@firstint*16)
  SELECT @charvalue = @charvalue +
    SUBSTRING(@hexstring, @firstint+1, 1) +
    SUBSTRING(@hexstring, @secondint+1, 1)
  SELECT @i = @i + 1
END

SELECT @hexvalue = @charvalue
GO

IF OBJECT_ID ('sp_help_revlogin') IS NOT NULL
  DROP PROCEDURE sp_help_revlogin
GO
CREATE PROCEDURE sp_help_revlogin @login_name sysname = NULL AS
DECLARE @name sysname
DECLARE @type varchar (1)
DECLARE @hasaccess int
DECLARE @denylogin int
DECLARE @is_disabled int
DECLARE @PWD_varbinary  varbinary (256)
DECLARE @PWD_string  varchar (514)
DECLARE @SID_varbinary varbinary (85)
DECLARE @SID_string varchar (514)
DECLARE @tmpstr  varchar (1024)
DECLARE @is_policy_checked varchar (3)
DECLARE @is_expiration_checked varchar (3)

DECLARE @defaultdb sysname

IF (@login_name IS NULL)
  DECLARE login_curs CURSOR FOR

      SELECT p.sid, p.name, p.type, p.is_disabled, p.default_database_name, l.hasaccess, l.denylogin FROM
sys.server_principals p LEFT JOIN sys.syslogins l
      ON ( l.name = p.name ) WHERE p.type IN ( 'S', 'G', 'U' ) AND p.name <> 'sa'
ELSE
  DECLARE login_curs CURSOR FOR


      SELECT p.sid, p.name, p.type, p.is_disabled, p.default_database_name, l.hasaccess, l.denylogin FROM
sys.server_principals p LEFT JOIN sys.syslogins l
      ON ( l.name = p.name ) WHERE p.type IN ( 'S', 'G', 'U' ) AND p.name = @login_name
OPEN login_curs

FETCH NEXT FROM login_curs INTO @SID_varbinary, @name, @type, @is_disabled, @defaultdb, @hasaccess, @denylogin
IF (@@fetch_status = -1)
BEGIN
  PRINT 'No login(s) found.'
  CLOSE login_curs
  DEALLOCATE login_curs
  RETURN -1
END
SET @tmpstr = '/* sp_help_revlogin script '
PRINT @tmpstr
SET @tmpstr = '** Generated ' + CONVERT (varchar, GETDATE()) + ' on ' + @@SERVERNAME + ' */'
PRINT @tmpstr
PRINT ''
WHILE (@@fetch_status <> -1)
BEGIN
  IF (@@fetch_status <> -2)
  BEGIN
    PRINT ''
    SET @tmpstr = '-- Login: ' + @name
    PRINT @tmpstr
    IF (@type IN ( 'G', 'U'))
    BEGIN -- NT authenticated account/group

      SET @tmpstr = 'CREATE LOGIN ' + QUOTENAME( @name ) + ' FROM WINDOWS WITH DEFAULT_DATABASE = [' + @defaultdb + ']'
    END
    ELSE BEGIN -- SQL Server authentication
        -- obtain password and sid
            SET @PWD_varbinary = CAST( LOGINPROPERTY( @name, 'PasswordHash' ) AS varbinary (256) )
        EXEC sp_hexadecimal @PWD_varbinary, @PWD_string OUT
        EXEC sp_hexadecimal @SID_varbinary,@SID_string OUT

        -- obtain password policy state
        SELECT @is_policy_checked = CASE is_policy_checked WHEN 1 THEN 'ON' WHEN 0 THEN 'OFF' ELSE NULL END FROM sys.sql_logins WHERE name = @name
        SELECT @is_expiration_checked = CASE is_expiration_checked WHEN 1 THEN 'ON' WHEN 0 THEN 'OFF' ELSE NULL END FROM sys.sql_logins WHERE name = @name

            SET @tmpstr = 'CREATE LOGIN ' + QUOTENAME( @name ) + ' WITH PASSWORD = ' + @PWD_string + ' HASHED, SID = ' + @SID_string + ', DEFAULT_DATABASE = [' + @defaultdb + ']'

        IF ( @is_policy_checked IS NOT NULL )
        BEGIN
          SET @tmpstr = @tmpstr + ', CHECK_POLICY = ' + @is_policy_checked
        END
        IF ( @is_expiration_checked IS NOT NULL )
        BEGIN
          SET @tmpstr = @tmpstr + ', CHECK_EXPIRATION = ' + @is_expiration_checked
        END
    END
    IF (@denylogin = 1)
    BEGIN -- login is denied access
      SET @tmpstr = @tmpstr + '; DENY CONNECT SQL TO ' + QUOTENAME( @name )
    END
    ELSE IF (@hasaccess = 0)
    BEGIN -- login exists but does not have access
      SET @tmpstr = @tmpstr + '; REVOKE CONNECT SQL TO ' + QUOTENAME( @name )
    END
    IF (@is_disabled = 1)
    BEGIN -- login is disabled
      SET @tmpstr = @tmpstr + '; ALTER LOGIN ' + QUOTENAME( @name ) + ' DISABLE'
    END
    PRINT @tmpstr
  END

  FETCH NEXT FROM login_curs INTO @SID_varbinary, @name, @type, @is_disabled, @defaultdb, @hasaccess, @denylogin
   END
CLOSE login_curs
DEALLOCATE login_curs
RETURN 0
GO

exec dbo.sp_help_revlogin
go

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