| Merge multiple tables in a database Posted: 17 Aug 2013 07:50 PM PDT I have a MySQL database with table names like 1,2,3... upto 1000 Each tables have 2000 rows and has the same structure. This is how all my 2000 table's structure look like id,url,title,content
id has type int, primary key,auto increment.
Now I would like to create a new database with name merged. Also a table with name merged_table. Can someone tell me how to import all my tables in merged_table? My problem here is all my tables has id from 1 to 2000. So I have no idea how to import them. I would like to have unique ids from 1 to 2000000 in my new merged_table I'm using ubuntu. So if someone suggest me a terminal command, that would be awesome. |
| MYSQL 5.6.12 Lock wait timeout exceeded, yet no transactions\locks currently taking place? Posted: 17 Aug 2013 06:58 PM PDT On a development database with no other users other than myself, I'm getting the following error #1205 - Lock wait timeout exceeded; try restarting transaction when trying to run a simple alter statement. ALTER TABLE proposals ADD STATUS INT( 1 ) NULL AFTER propnum ;
if I run SHOW ENGINE INNODB STATUS I get the following. ===================================== 2013-08-17 20:51:54 fa8 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 46 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 935 srv_active, 0 srv_shutdown, 104952 srv_idle srv_master_thread log flush and writes: 105884 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 399 OS WAIT ARRAY INFO: signal count 408 Mutex spin waits 267, rounds 3238, OS waits 94 RW-shared spins 281, rounds 8430, OS waits 281 RW-excl spins 17, rounds 770, OS waits 23 Spin rounds per wait: 12.13 mutex, 30.00 RW-shared, 45.29 RW-excl ------------ TRANSACTIONS ------------ Trx id counter 29698 Purge done for trx's n:o < 29691 undo n:o < 0 state: running but idle History list length 1091 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 0, not started MySQL thread id 1278, OS thread handle 0xfa8, query id 9178 localhost ::1 david init SHOW ENGINE INNODB STATUS -------- FILE I/O -------- I/O thread 0 state: wait Windows aio (insert buffer thread) I/O thread 1 state: wait Windows aio (log thread) I/O thread 2 state: wait Windows aio (read thread) I/O thread 3 state: wait Windows aio (read thread) I/O thread 4 state: wait Windows aio (read thread) I/O thread 5 state: wait Windows aio (read thread) I/O thread 6 state: wait Windows aio (write thread) I/O thread 7 state: wait Windows aio (write thread) I/O thread 8 state: wait Windows aio (write thread) I/O thread 9 state: wait Windows aio (write thread) Pending normal aio reads: 0 [0, 0, 0, 0] , aio writes: 0 [0, 0, 0, 0] , ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0 Pending flushes (fsync) log: 0; buffer pool: 0 501 OS file reads, 3733 OS file writes, 1948 OS fsyncs 0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s ------------------------------------- INSERT BUFFER AND ADAPTIVE HASH INDEX ------------------------------------- Ibuf: size 1, free list len 0, seg size 2, 0 merges merged operations: insert 0, delete mark 0, delete 0 discarded operations: insert 0, delete mark 0, delete 0 Hash table size 591553, node heap has 2 buffer(s) 0.00 hash searches/s, 0.00 non-hash searches/s --- LOG --- Log sequence number 13235364 Log flushed up to 13235364 Pages flushed up to 13235364 Last checkpoint at 13235364 0 pending log writes, 0 pending chkp writes 1045 log i/o's done, 0.00 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total memory allocated 305856512; in additional pool allocated 0 Dictionary memory allocated 113054 Buffer pool size 18240 Free buffers 17691 Database pages 547 Old database pages 209 Modified db pages 0 Pending reads 0 Pending writes: LRU 0, flush list 0, single page 0 Pages made young 0, not young 0 0.00 youngs/s, 0.00 non-youngs/s Pages read 450, created 97, written 2355 0.00 reads/s, 0.00 creates/s, 0.00 writes/s Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000 Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s LRU len: 547, unzip_LRU len: 0 I/O sum[0]:cur[0], unzip sum[0]:cur[0] -------------- ROW OPERATIONS -------------- 0 queries inside InnoDB, 0 queries in queue 0 read views open inside InnoDB Main thread id 1404, state: sleeping Number of rows inserted 298, updated 336, deleted 9, read 136560 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================
To my limited knowledge, I don't see any pending transactions. If I stop\restart the MySql service, I can run the statement, but this is the 3rd time such an error has occurred and I would like to get to the bottom of it so I can learn what is going wrong, if that's possible. Is this a known issue or should I just restart the service every time this happens and move on? |
| Why are some aggregates treated differently in the RHS of a rule in the model clause? Posted: 17 Aug 2013 12:23 PM PDT With my limited understanding of the model clause, I'd expected the following three queries to return the same results because there are no nulls in the data, and the functions are equivalent: select * from (select level k, 100 v from dual connect by level<=2) model return updated rows dimension by (k) measures (v, 0 shr) rules ( shr[any] = v[cv()]/sum(v)[any] ); --plain sum /* K V SHR ---------- ---------- ---------- 1 100 0.5 2 100 0.5 */ select * from (select level k, 100 v from dual connect by level<=2) model return updated rows dimension by (k) measures (v, 0 shr) rules ( shr[any] = v[cv()]/nullif(sum(v)[any],0) ); --with nullif /* K V SHR ---------- ---------- ---------- 1 100 0.25 <------\___ why? 2 100 0.25 <------/ */ select * from (select level k, 100 v from dual connect by level<=2) model return updated rows dimension by (k) measures (v, 0 shr) rules ( shr[any] = v[cv()]/decode(sum(v)[any],0,null,sum(v)[any]) ); -- with decode /* K V SHR ---------- ---------- ---------- 1 100 0.5 2 100 0.5 */
What am I missing about the processing of rules that explains this behaviour? SQLFiddle here |
| My log file is large, what should I do? [duplicate] Posted: 17 Aug 2013 06:14 PM PDT This question already has an answer here: My transaction log is larger than I'd like it to be, and I want to know how I can fix that. |
| How to get SQL Server 2012 to use the invariant culture in format()? Posted: 17 Aug 2013 03:12 PM PDT I'm trying to get the built-in format() function in SQL Server 2012 to use the invariant culture. It is said in the documentation that the function accepts a .NET culture identifier as the third parameter. The identifier for the invariant culture is a blank string: You specify the invariant culture by name by using an empty string ("") in the call to a CultureInfo instantiation method. That does not work with SQL Server however: select format(getdate(), N'g', '');
Msg 9818, Level 16, State 1, Line 1
The culture parameter '' provided in the function call is not supported. It is also documented that the invariant culture is associated with the English language, but not with any country/region. One would think this allows to pass 'en' as the identifier, but then, in .NET, CultureInfo.InvariantCulture.Equals(CultureInfo.GetCultureInfo("")) yields true, but CultureInfo.InvariantCulture.Equals(CultureInfo.GetCultureInfo("en")) gives false, so they aren't really the same. So how do I make SQL Server to use the invariant culture? (Note: I'm interested in making the built-in thing to work. I already have my own CLR functions to do this, I was going to remove them in favor of the now-built-in functionality). Microsoft SQL Server 2012 (SP1) - 11.0.3128.0 (X64)
Dec 28 2012 20:23:12
Copyright (c) Microsoft Corporation
Business Intelligence Edition (64-bit) on Windows NT 6.0 (Build 6002: Service Pack 2) (Hypervisor) |
| Query approval/workflow for ad-hoc user direct access Posted: 17 Aug 2013 09:52 AM PDT I am coming into a project late, where non-IT users are being granted access to run ad-hoc read-only/SELECT-only queries against an Oracle database. The users will have Oracle accounts and connect directly with TOAD. Automated reports are created for common reporting and presented to end users through Cognos. However, based upon these basic reports, a select group of individuals will be given the ability to then connect directly against the database to run ad-hoc queries to do additional research/data mining. In order to control this activity, they are trying to implement a business process where the exact queries run or at least the general form will be preapproved (creating a whitelist) and then the logs will be reviewed to ensure that only the whitelisted queries were run; any other queries would be subject to investigation. I am not very happy with this setup for a risk control standpoint, because while the log review may be a suitable detective control and could be performed manually (less than 100 queries are expected to be run this way per work day), I would prefer that the end users not even have the ability to do something malicious (e.g., dump the whole database) in the first place, as this could cause some serious liability/risk based on the data held in the database. I have suggested that they develop the queries in a test environment on dummy data, modify, and then have them used in production through a DBA or some other automated process to prevent a non-whitelisted query from being run in the first place. They also claim that the queries would vary greatly, so they can't use some type of form-based app that just changes the key search terms and conditions. My thought would be to create some type of app with a workflow where Alice would enter a query to run and Bob would have to then approve it before it was actually executed. I was told there is no budget or time to create something like this. So I was wondering if there is any built in functionality or tools that would provide some similar type of approve-before-execute flow. I would also be open to other suggestion that fit the parameters I am forced to deal with (business users must be able to submit ad-hoc queries to be run in a reasonable time frame after creation and a custom app cannot be written to manage the workflow). |
| Whether or not to create separate tables Posted: 17 Aug 2013 10:46 AM PDT I am working on a project, where I need to store the information related to A and B, the A and B both have identical columns.There might be thousands of As and Bs. Should I use "type" column to differentiate between these two ? Is there any performance issue because each time it will require a full table search ? I have 3 tables that are having similar structure for A and B. |
| Error in running SQL Server script Posted: 17 Aug 2013 10:12 AM PDT I copied oldDatabase as newDatabase. Modified newDatabase's schema.
Meanwhile, oldDatabase's data are processing and updating. I want to copy oldDatabase's data to newDatabase. What I have done is: - Clean the data of
newDatabase - Generate data only script of
oldDatabase - Run this script in
newDatabase. And I got a lot of error messages like: Cannot insert explicit value for identity column in table 'MyTableName' when IDENTITY_INSERT is set to OFF. Invalid column name 'MyColumnName'. Violation of PRIMARY KEY constraint 'PK_MyTableName'. Cannot insert duplicate key in object 'dbo.MyTableName'.
Some tables and rows data are affected. But, tables with above error are not affected. How can I fix it? Is there a best way to make this stuff? PS I run my script using this command , sqlcmd -S myServerName -U userName -P passowrd -i PathOfMyScriptFile
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| Which one should i use Triggers OR Events for my criteria? Posted: 17 Aug 2013 03:46 AM PDT I have tables in mysql database like 1) absentees 2) Fee Collection 3) Sales 4) Purchases If some entries inserted into these tables i want to save my custom details in another table 5) Events. Example : Suppose if attendance table has data inserted on today. I want to take the count of absentees and insert the count value into Events Table. I want to do this task on 05:30 PM in the evening whenever the insertions/updates made to above 4 tables. could any one please tell me how to achieve this.?? |
| How to loop through AS400 table with cursor Posted: 17 Aug 2013 10:06 AM PDT I have a AS400 table that contains multiple rows per person. Each row contains data concerning a transaction by the person including points assigned to each transaction. I read through all rows for one person ordered by the points. The first row with the highest points, I leave alone. On subsequent rows the point values are cut in half and I do an update. I am currently using a cursor to open the table and doing a Loop to read through the rows. I am getting an -508 error stating : An UPDATE or DELETE statement with a WHERE CURRENT OF CL was attempted, but the cursor is not positioned on a row or is positioned on a row, but the row is not locked because a COMMIT HOLD or ROLLBACK HOLD statement released the lock on the row. A FETCH statement must be issued to position the cursor on a row and lock the row. Recovery . . . : Issue a FETCH statement to position the cursor on a row and lock the row; then, try the request again. Part of my code is below: DECLARE V_LNAME CHAR ( 30 ) ; DECLARE V_LNAMEHOLD CHAR ( 30 ) ; DECLARE V_FNAME CHAR ( 15 ) ; DECLARE V_FNAMEHOLD CHAR ( 15 ) ; DECLARE V_DOB DATE ; DECLARE V_DOBHOLD DATE ; DECLARE V_TRANSNMBR CHAR ( 9 ) ; DECLARE V_TRANSNMBRHOLD CHAR ( 9 ) ; DECLARE V_POINTS NUMERIC ( 5 ) ; DECLARE V_POINTSHOLD NUMERIC ( 5 ) ; DECLARE V_POINTSEQ NUMERIC ( 5 ) ; DECLARE FIRSTRECORD CHAR ( 1 ) ; DECLARE CL CURSOR FOR SELECT LNAME , FNAME , DOB , TRANSNCNMBR , TOPOINTS FROM DB_TRANSDATA ORDER BY LNAME ASC , FNAME ASC , DOB ASC , TOPOINTS DESC ; DECLARE CLHLD CURSOR FOR SELECT LNAME , FNAME , DOB , TRANSNCNMBR , TOPOINTS FROM DB_TRANSDATA ORDER BY LNAME ASC , FNAME ASC , DOB ASC , TOPOINTS DESC ; OPEN CLHLD ; FETCH CLHLD INTO V_LNAMEHOLD , V_FNAMEHOLD , V_DOBHOLD , V_TRANSNMBRHOLD ; close clhld; OPEN CL ; SET FIRSTRECORD = 'Y' ; LOOP FETCH CL INTO V_LNAME , V_FNAME , V_DOB , V_TRANSNMBR , V_POINTS , V_POINTSEQ ; IF TRIM ( CHAR ( V_LNAME ) ) = TRIM ( CHAR ( V_LNAMEHOLD ) ) AND TRIM ( CHAR ( V_FNAME ) ) = TRIM ( CHAR ( V_FNAMEHOLD ) ) AND V_DOB = V_DOBHOLD AND V_TRANSNMBR = V_TRANSNMBRHOLD AND FIRSTRECORD = 'N' THEN SET V_POINTSEQ = V_POINTS * .5 ; UPDATE DB_TRANSDATA SET POINTSEQ = V_POINTSEQ WHERE CURRENT OF CL ; SET V_LNAMEHOLD = V_LNAME ; SET V_FNAMEHOLD = V_FNAME ; SET V_DOBHOLD = V_DOB ; SET V_TRANSNMBRHOLD = V_TRANSNMBR ; ELSE UPDATE DB_TRANSDATA SET POINTSEQ = V_POINTS WHERE CURRENT OF CL ; SET V_LNAMEHOLD = V_LNAME ; SET V_FNAMEHOLD = V_FNAME ; SET V_DOBHOLD = V_DOB ; SET V_TRANSNMBRHOLD = V_TRANSNMBR ; SET FIRSTRECORD = 'N' ; END IF ; END LOOP ; CLOSE CL; END ;
|
| Bulk insert with format file: 0 rows affected Posted: 17 Aug 2013 12:06 PM PDT When using the BULK INSERT command in SQL Server 2008 it returns: (0 row(s) affected)
I am using this command to carry out the bulk insert: BULK INSERT Test FROM 'C:\DataFiles\Tests.dat' WITH (FORMATFILE = 'C:\DataFiles\FormatFiles\TestFormat.Fmt'); GO
Tests.dat contains: b00d23fe-580e-42dc-abd4-e8a054395126,48dd5dd6e3a144f7a817f234dd51469c,452eb8ce-6ae2-4e7a-a389-1097882c83ab,,, ,,,,Aria,,,160,,,86400,,2004-04-03 23:23:00.000,,2012-07-06 13:26:31.633,2012-07-06 13:27:44.650,3,,,,51B7A831-4731-4E2E-ACEC-06636ADC7AD3,,0,,0,,Field Name 1,,Field Name 2,,Field Name 3,,Field Name 4, and the format file TestFormat.fmt contains: 9.0 39 1 SQLCHAR 0 37 "," 1 Key "" 2 SQLCHAR 0 37 "," 2 TestType "" 3 SQLCHAR 0 37 "," 3 CaseKey "" 4 SQLCHAR 0 30 "," 4 Height "" 5 SQLCHAR 0 30 "," 5 Weight "" 6 SQLCHAR 0 128 "," 6 PacemakerType Latin1_General_CI_AI 7 SQLCHAR 0 0 "," 7 Diary Latin1_General_CI_AI 8 SQLCHAR 0 0 "," 8 Indication Latin1_General_CI_AI 9 SQLCHAR 0 0 "," 9 Medication Latin1_General_CI_AI 10 SQLCHAR 0 37 "," 10 RecorderType "" 11 SQLCHAR 0 100 "," 11 RecorderSerial Latin1_General_CI_AI 12 SQLCHAR 0 0 "," 12 Comments Latin1_General_CI_AI 13 SQLCHAR 0 12 "," 13 Status "" 14 SQLCHAR 0 0 "," 14 AdditionalData Latin1_General_CI_AI 15 SQLCHAR 0 37 "," 15 OrderKey "" 16 SQLCHAR 0 12 "," 16 Duration "" 17 SQLCHAR 0 12 "," 17 Age "" 18 SQLCHAR 0 24 "," 18 RecordingStartDateTime "" 19 SQLCHAR 0 128 "," 19 Ward Latin1_General_CI_AI 20 SQLCHAR 0 24 "," 20 CreatedDateTime "" 21 SQLCHAR 0 24 "," 21 UpdatedDateTime "" 22 SQLCHAR 0 21 "," 22 UserGroupBits "" 23 SQLCHAR 0 24 "," 23 LastArchive "" 24 SQLCHAR 0 128 "," 24 PointOfCare Latin1_General_CI_AI 25 SQLCHAR 0 128 "," 25 Bed Latin1_General_CI_AI 26 SQLCHAR 0 37 "," 26 DownloadFacilityKey "" 27 SQLCHAR 0 37 "," 27 AnalysisFacilityKey "" 28 SQLCHAR 0 12 "," 28 Priority "" 29 SQLCHAR 0 37 "," 29 FacilityKey "" 30 SQLCHAR 0 12 "," 30 PacemakerTypeStandard "" 31 SQLCHAR 0 128 "," 31 TestTypeName Latin1_General_CI_AI 32 SQLCHAR 0 128 "," 32 UserDefined1Name Latin1_General_CI_AI 33 SQLCHAR 0 128 "," 33 UserDefined1Value Latin1_General_CI_AI 34 SQLCHAR 0 128 "," 34 UserDefined2Name Latin1_General_CI_AI 35 SQLCHAR 0 128 "," 35 UserDefined2Value Latin1_General_CI_AI 36 SQLCHAR 0 128 "," 36 UserDefined3Name Latin1_General_CI_AI 37 SQLCHAR 0 128 "," 37 UserDefined3Value Latin1_General_CI_AI 38 SQLCHAR 0 128 "," 38 UserDefined4Name Latin1_General_CI_AI 39 SQLCHAR 0 128 "\r\n" 39 UserDefined4Value Latin1_General_CI_AI
I cannot figure out why this isn't working. Other people have had similar problems because they had more fields than actual columns in their database. Or using .csv files which are not supported apparently. This works fine on every other table in the database I am importing with no errors so I can't understand why it doesn't work here. |
| Does openquery use distributed transactions? Posted: 17 Aug 2013 06:06 AM PDT Does openquery in SQL Server 2005 use distributed transactions? If so, in which cases does it? |
| Strange Locking issues while playing back logs via percona playback Posted: 17 Aug 2013 09:06 AM PDT Problem while replaying logs I am in the process of benchmarking a new DB node (specs at the end) and have run across some strange behavior: As described here i: - Created a dump (innobackupex ftw)
- I logged all my queries for an hour
- Setup my new db (same my.cnf as the live db only with a higher innodb_buffer_pool_size)
- Started the replay of my slow query log
As per the documentation: percona-playback --mysql-host=127.0.0.1\ --mysql-user=root --mysql-schema=my_db\ --query-log-file=slow.log
This works fine for about 15 minutes, then I start getting strange locking problems: Error during query: Lock wait timeout exceeded; try restarting transaction, number of tries 0
I started debugging my current load on the db and found that only one single query was running: (taken from innodb status) ---TRANSACTION 1C5264768, ACTIVE 44 sec inserting mysql tables in use 1, locked 1 LOCK WAIT 2 lock struct(s), heap size 376, 1 row lock(s) MySQL thread id 4289, OS thread handle 0x7f7fb0779700, query id 77515 localhost 127.0.0.1 root update insert into sessions (a, b, c, d, e, e, f, g, h, i, j, k, l, m, n, o, p, q) values (0, 682, ------- TRX HAS BEEN WAITING 44 SEC FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 4549 page no 7875876 n bits 104 index `PRIMARY` of table `production`.`sessions` trx id 1C5264768 lock_mode X insert intention waiting ------------------ TABLE LOCK table `production`.`sessions` trx id 1C5264768 lock mode IX RECORD LOCKS space id 4549 page no 7875876 n bits 104 index `PRIMARY` of table `production`.`sessions` trx id 1C5264768 lock_mode X insert intention waiting ---TRANSACTION 1C526475D, ACTIVE (PREPARED) 452 sec 2 lock struct(s), heap size 376, 1 row lock(s) MySQL thread id 1722, OS thread handle 0x7f7fb083d700, query id 77311 localhost 127.0.0.1 root Trx read view will not see trx with id >= 1C526475E, sees < 1C525BA04 TABLE LOCK table `production`.`sessions` trx id 1C526475D lock mode IX RECORD LOCKS space id 4549 page no 7875876 n bits 104 index `PRIMARY` of table `production`.`sessions` trx id 1C526475D lock_mode X ---------------------------- END OF INNODB MONITOR OUTPUT
And only one table open: mysql> SHOW OPEN TABLES from production where In_use != 0; +----------------------+--------------+--------+-------------+ | Database | Table | In_use | Name_locked | +----------------------+--------------+--------+-------------+ | production | sessions | 1 | 0 | +----------------------+--------------+--------+-------------+ 1 row in set (0.00 sec)
This situation stays like this for about 3-4 minutes and then suddenly playback continues. These issues do not happen on the live db: we have some issues with locking but we have never exceeded the innodb_lock_wait_timeout value. I am most likely missing something obvious but for the life of me i can't figure it out, but why would the replay hang like that or better yet why would mysql remain in this lock state? The relevant entries in the slow log are from our jee server: XA START 0xbe681101606ce8d1676630322c7365727665722c5035313337,0x676630322c7365727665722c50353133372c00,0x4a5453; insert into sessions (a, b, c, d, e, e, f, g, h, i, j, k, l, m, n, o, p, q) values (0, 682, ...); XA END 0xbe681101606ce8d1676630322c7365727665722c5035313337,0x676630322c7365727665722c50353133372c00,0x4a5453;
Does hibernate's transaction handling have anything to do with the way the lock is generated and not closed? Server Specs - Ubuntu 12.04.2 LTS
- percona-server-server-5.5 version 5.5.32-rel31.0-549.precise
Relavent config: max_connections = 1500 sort_buffer_size = 1M thread_cache_size = 1000 max_heap_table_size = 512M tmp_table_size = 512M join_buffer_size = 67108864 expand_fast_index_creation = ON open_files_limit = 65535 table_definition_cache = 4096 table_open_cache = 262144 max_allowed_packet = 16M thread_stack = 192K query_cache_limit = 1M query_cache_size = 512M thread_concurrency = 8 query_cache_type = 1 long_query_time = 2 log_slave_updates = 1 expire_logs_days = 10 max_binlog_size = 100M
Innodb config: default_storage_engine = InnoDB innodb_file_per_table = 1 innodb_old_blocks_time = 1000 innodb_buffer_pool_size = 163456M innodb_log_file_size = 256M innodb_flush_method = O_DIRECT innodb_read_io_threads = 4 innodb_write_io_threads = 4 innodb_doublewrite = FALSE innodb_flush_log_at_trx_commit = 2
Thanks for any help or experience in this area! Edit I have been playing with some of the innodb variables and with the help of innodb_show_verbose_locks have been able to determine a bit more. In this example: ---TRANSACTION 1C52D8AB4, ACTIVE 49 sec inserting mysql tables in use 1, locked 1 LOCK WAIT 2 lock struct(s), heap size 376, 1 row lock(s) MySQL thread id 18602, OS thread handle 0x7f007a4a0700, query id 624263 localhost 127.0.0.1 root update INSERT INTO `images` (A,B,C...) VALUES (....) ------- TRX HAS BEEN WAITING 49 SEC FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 51 page no 16791 n bits 152 index `PRIMARY` of table `production`.`images` trx id 1C52D8AB4 lock_mode X insert intention waiting Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0 0: len 8; hex 73757072656d756d; asc supremum;; ------------------ TABLE LOCK table `production`.`images` trx id 1C52D8AB4 lock mode IX RECORD LOCKS space id 51 page no 16791 n bits 152 index `PRIMARY` of table `production`.`images` trx id 1C52D8AB4 lock_mode X insert intention waiting Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0 0: len 8; hex 73757072656d756d; asc supremum;; ---TRANSACTION 1C52D8AA9, ACTIVE 151 sec 2 lock struct(s), heap size 376, 1 row lock(s) MySQL thread id 18460, OS thread handle 0x7f007454e700, query id 624243 localhost 127.0.0.1 root TABLE LOCK table `production`.`images` trx id 1C52D8AA9 lock mode IX RECORD LOCKS space id 51 page no 16791 n bits 152 index `PRIMARY` of table `production`.`images` trx id 1C52D8AA9 lock_mode X Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0 0: len 8; hex 73757072656d756d; asc supremum;;
Both transaction 1C52D8AA9 and 1C52D8AB4 have an IX lock on address 73757072656d756d which is fine as i gather from this post since innodb uses MGL locking. However the Followup X Locking (seen here: "id 1C52D8AB4 lock_mode X insert intention waiting") is missing. |
| Greyed out menu options, broken activity monitor Posted: 17 Aug 2013 10:05 AM PDT I recently installed SP1 on my 2012 SQL Server. Ever since then SSMS has behaved a little weirdly when I connect from my pc rather than from the local server itself. I no longer see the green "running" icons on the server and on the agent, and several menu options are greyed out (Start/Stop/Restart on server menu and agent menu). 
Also, when I try to access the Activity Monitor, I get the following error: 
Error Detail I found the following article about the Activity Monitor. I followed the steps there (although I am a local admin on the sql server and should have had all of those permissions already) to no avail. The server is running Windows 2008 R2 Datacenter SP1. When I remote desktop to the server itself and use SSMS directly I have none of these issues, and when a domain admin connects to the server through SSMS remotely everything also works for him. Any ideas? |
| How to change a column type from SET to an ENUM Posted: 17 Aug 2013 11:06 AM PDT I have a table with a SET column type that need to be changed to ENUM type. Can I do it with a simple ALTER or will this mess up my data? NB: there are no multiple values (a,b,c) in the table. |
| Create a trigger to update table data on another Server's database Posted: 17 Aug 2013 08:07 PM PDT I am creating a trigger in MySQL and I need a little help. I have 2 websites, 2 databases (same name) on 2 different web servers, S1 & S2. These databases have the same tables names. I want both the user data on both the websites to be the same. So if one user registers on S1, then that user registration information should be passed to S2. If a user registration information is updated on S1, the same information should be updated on S2. And the same applies for S2. How can I create a trigger so that every time there is an insert / update / delete in database on S1, then the user table on S2 also gets automatically updated. And every time there is an insert / update / delete in database on S2, then the user table on S1 also get automatically updated. Is this possible? Could you provide some examples? |
| Tool to export data with all relational data? Posted: 17 Aug 2013 06:19 PM PDT Is there a tool to export data from selected rows in a table with all data stored in other tables in other tables linked by relational design? The purpose is to ease migrations of bits of data between servers for adhoc migrations. I am looking specifically for a tool for MySQL InnoDB with defined foreign keys. |
| MySQL Full Text search increase relevance for exact matches? Posted: 17 Aug 2013 01:07 PM PDT I have a MySQL database of ~10,000 organisation names that I want to be able to search. I would like to use a full text search because this would enable me to find "institute of doobry" by searching "doobry institute" etc. The problem I have is that I have lots of entries like "institute of doobry canteen" and "institute of doobry alumni association". MATCH (names) AGAINST ("doobry institute")
will return all of these records and will not score institute of doobry higher than the canteen. I'd sort of like to say: score it higher if the word count is similar. Is there any way to achieve this? |
| mysql: need help to optimize my query/table Posted: 17 Aug 2013 02:07 PM PDT I'm wondering if someone could help me optimize my tables/query to speed up a query. It is currently running ridiculously slow. I think a well-thought out index could help me. Any help would be really appreciated Tables URLS and TAGS mentioned below are 2 and 20 million rows respectively (will probably end up having 10x). A query like the one below already takes 10 seconds to run. An Example: http://whatrethebest.com/php+tutorials Tables CREATE TABLE IF NOT EXISTS `TAGS` ( `hash` varchar(255) NOT NULL, `tag` varchar(255) NOT NULL, UNIQUE KEY `my_unique_key` (`hash`,`tag`), KEY `tag` (`tag`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
and CREATE TABLE IF NOT EXISTS `URLS` ( `url` text NOT NULL, `domain` text, `title` text NOT NULL, `description` text, `numsaves` int(11) NOT NULL, `firstsaved` varchar(256) DEFAULT NULL, `md5` varchar(255) NOT NULL DEFAULT '', PRIMARY KEY (`md5`), UNIQUE KEY `md5` (`md5`), KEY `numsaves` (`numsaves`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
QUERY SELECT urls.md5, urls.url, urls.title, urls.numsaves FROM urls JOIN tags ON urls.md5 = tags.hash WHERE tags.tag IN ( 'php', 'tutorials' ) GROUP BY urls.md5 HAVING COUNT( * ) =2 ORDER BY urls.numsaves DESC LIMIT 20
EXPLAIN I'm not sure what this shows id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE tags range my_unique_key,tag tag 767 NULL 230946 Using where; Using index; Using temporary; Using filesort 1 SIMPLE urls eq_ref PRIMARY,md5 PRIMARY 767 jcooper_whatrethebest_urls.tags.hash 1
So I think the problem is: certain tags like 'php have 34,000 entries, most of which only have under 5 saves. But in order to get the 20 most saved it is having to sort them all.Right? I can't really create a 'numsaves' column in TAGS and index on that because that number will be changing up and down, and that wouldnt make sense. Is it possible to create a cross-table index between urls.numsaves and tags.tag? Or a third table to use in my query somehow? Would this solve my problem? I know almost nothing about indexing. Any help would be really appreciated!
EDITS BELOW RESPONSE TO YperCube: Thank you, Thank you, your suggestions have sped up my queries by a factor of 10-20X . This is an immense improvement. I can't thank you enough. I'm posting my current queries and tables with execution times in case you or anyone else has any more optimization suggestions. I am worried that as my table grows I may not be able to keep my search times under 3 seconds, which would be a killer. New Query Example 1 SELECT u.id, u.url, u.title, u.numsaves FROM urls AS u JOIN tags AS t1 ON t1.url_id = u.id AND t1.tag = 'programming' JOIN tags AS t2 ON t2.url_id = u.id AND t2.tag = 'language' ORDER BY u.numsaves DESC LIMIT 20 Showing rows 20 - 19 ( 20 total, Query took 0.2009 sec) id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ref tag_id tag_id 767 const 53820 Using where; Using index; Using temporary; Using filesort 1 SIMPLE t1 ref tag_id tag_id 772 const,jcooper_whatrethebest_urls.t2.url_id 1 Using where; Using index 1 SIMPLE u eq_ref PRIMARY,id_numsaves_IX PRIMARY 4 jcooper_whatrethebest_urls.t2.url_id 1
Neq Query Example 2 (seems to be slower) SELECT u.id, u.url, u.title, u.numsaves FROM urls AS u JOIN ( SELECT ui.id, ui.numsaves FROM urls AS ui JOIN tags AS t1 ON t1.url_id = ui.id AND t1.tag = 'programming' JOIN tags AS t2 ON t2.url_id = ui.id AND t2.tag = 'language' ORDER BY ui.numsaves DESC LIMIT 20 ) AS ulim ON ulim.id = u.id ORDER BY ulim.numsaves DESC ; Showing rows 0 - 29 ( 2,794,577 total, Query took 0.4633 sec) id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 20 Using filesort 1 PRIMARY u eq_ref PRIMARY,id_numsaves_IX PRIMARY 4 ulim.id 1 2 DERIVED t2 ref tag_id tag_id 767 53820 Using where; Using index; Using temporary; Using filesort 2 DERIVED t1 ref tag_id tag_id 772 jcooper_whatrethebest_urls.t2.url_id 1 Using where; Using index 2 DERIVED ui eq_ref PRIMARY,id_numsaves_IX PRIMARY 4 jcooper_whatrethebest_urls.t2.url_id 1
Using Query Example on a Single Tag (slower by a lot) SELECT u.id, u.url, u.title, u.numsaves FROM urls AS u JOIN tags AS t1 ON t1.url_id = u.id AND t1.tag = 'programming' ORDER BY u.numsaves DESC LIMIT 20 Showing rows 20 - 19 ( 20 total, Query took 3.7395 sec) id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref tag_id tag_id 767 const 200576 Using where; Using index; Using temporary; Using filesort 1 SIMPLE u eq_ref PRIMARY,id_numsaves_IX PRIMARY 4 jcooper_whatrethebest_urls.t1.url_id 1
I'm not sure why this one is so much slower? Do you have any ideas of a query to optimize for querying a single tag? My Current Tables CREATE TABLE `urls` ( `id` int(11) NOT NULL AUTO_INCREMENT, `url` text NOT NULL, `domain` text, `title` text NOT NULL, `description` text, `numsaves` int(11) NOT NULL, `firstsaved` varchar(256) DEFAULT NULL, `md5` varchar(255) NOT NULL DEFAULT '', PRIMARY KEY (`id`), UNIQUE KEY `md5` (`md5`), KEY `id_numsaves_IX` (`id`,`numsaves`) ) ENGINE=InnoDB AUTO_INCREMENT=2958560 DEFAULT CHARSET=utf8 CREATE TABLE `tags` ( `url_id` int(11) DEFAULT NULL, `hash` varchar(255) NOT NULL, `tag` varchar(255) NOT NULL, UNIQUE KEY `tag_id` (`tag`,`url_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8
Thank you again |
| MySQL replication using a lot of IO Posted: 17 Aug 2013 04:06 AM PDT I'm having big troubles on a database pool I've setup recently. There is a master, and 4 slaves replicating one DB. All using MyISAM engine. Thing is, during the replication period (when the slave is not up to date), the IO% showing in iotop is equal to 99% for mysqld. Besides, I'm having a big latency when connecting a web application to any of these databases (master included). All these servers are virtual machines running Ubuntu 12.04, having 4vcpu each and 12GB RAM. If you need more information about the config (system/mysql), please tell me, I'll update my post. Thing is, I need some hint about where to search, because for now I was not able to identify the problem. EDIT: I'm adding the conf files for the master and for a replica : master configuration file replica configuration file |
| Replication on MySQL server Posted: 17 Aug 2013 04:07 PM PDT I had to stop the slave server to test something. After I started the server again there is a problem with replication on MySQL server On the problematic server mysql> SHOW SLAVE STATUS\G *************************** 1. row *************************** Slave_IO_State: Connecting to master Master_Host: servera Master_User: replica Master_Port: 3306 Connect_Retry: 60 Master_Log_File: servera-bin.000024 Read_Master_Log_Pos: 808459481 Relay_Log_File: serverb-relay-bin.000071 Relay_Log_Pos: 4 Relay_Master_Log_File: servera-bin.000024 Slave_IO_Running: No Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 808459481 Relay_Log_Space: 106 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 1129 Last_IO_Error: error connecting to master 'replica@servera:3306' - retry-time: 60 retries: 86400 Last_SQL_Errno: 0 Last_SQL_Error:
on the problematic server: SELECT user, host FROM mysql.user WHERE Repl_slave_priv = 'Y'; +---------+-----------+ | user | host | +---------+-----------+ | root | localhost | | root | serverb | | root | 127.0.0.1 | | replica | servera | | replica | serverb | +---------+-----------+
on the main server: SELECT user, host FROM mysql.user WHERE Repl_slave_priv = 'Y'; +---------+-----------+ | user | host | +---------+-----------+ | root | localhost | | root | servera | | root | 127.0.0.1 | | replica | servera | | replica | serverb | +---------+-----------+
according to what I've read, there is a need to execute the following command om the main server: mysql> FLUSH HOSTS;
What will happen then? if there is any application connected to it - will it disconnect it also? |
| Merge Replication identity field issues Posted: 17 Aug 2013 03:07 PM PDT One of our clients is using our software with merge replication of a database on a SQL Server 2008 R2 machine. There are two production environments in separate geographical locations only one of which is live at any one time, so basically one and live one on standby. Only the live database is updated by teh applications. Every couple of months they failover between the datacentres and the standby environment become the live centre. There is an instance of SQL Server 2008 in each datacentre and merge replication is used to keep them in sync. This was all working ok until the beginning of the year when we started getting replication errors with some lTID columns in various tables that have the Identity property set. The errors were like this one: The insert failed. It conflicted with an identity range check constraint in database 'GateMain', replicated table 'dbo.tGateCalcsLog', column 'lTID'. If the identity column is automatically managed by replication, update the range as follows: for the Publisher, execute sp_adjustpublisheridentityrange; for the Subscriber, run the Distribution Agent or the Merge Agent. Then after the last failover we noticed we had an issue with the lTID values in one specific table. Our application relies on the lTID value always having incremented in order such that the highest lTID value is always the newest entry in the table. We've found that due to how the identity ranges are being managed by replication that when the system is failed over that the lTID range of the now live database server may have a range of values that are lower than those already present in the table. Is there a way to manage this in merge replication so we can guarantee that the next identity value allocated to the lTID column in greater than any lTID currently in the table? Or do we need to use a different type of replication or possibly mirroring? |
| How can I replicate some tables without transferring the entire log? Posted: 17 Aug 2013 05:06 AM PDT I have a mysql database that contains some tables with private information, and some tables with public information. I would like to replicate only the tables containing public information from one database to another, making sure that NO confidential information ever gets stored on the slave. I know I can use the replicate-do-table to specify that only some tables are replicated, but my understanding is that the entire bin log is transferred to the slave. Is there a way to ensure that only the public information is transferred to the slave? |
| MySQL Slaves lag behind master Posted: 17 Aug 2013 05:07 PM PDT I have one master and four slaves. Sometimes all my slaves lag behind the master. I have implemented the heartbeat for monitoring replication lag. Now I am trying to find why the slaves are lagging behind the master. I saw the slow queries (for today) on the master and I found that the slowest query (DML) was taking 138 seconds. But the slaves were lagging about 1400 seconds and there were also no slow queries on the slaves for DML (update, delete, insert, etc.). Points to be taken into consideration: - All tables are InnoDB.
- 68 GB of RAM (Master as well as slaves).
- Data size about 1 TB.
- Master and slave are running from a long.
What may be the reason for lag? |
| content types of insertion Posted: 17 Aug 2013 02:06 AM PDT I have a CSV file that contains a lot of integer values. Is it better to insert these individual values in bulk as in a full transaction or should I be inserting the CSV file itself into the MySQL? |
| Indexing a longtext field Posted: 17 Aug 2013 03:06 AM PDT I would like to run an index on a longtext field using: CREATE INDEX post_meta ON wp_postmeta (meta_value(8)); There are currently ~1 million records. Questions: - Will creating this index affect the data in any way whatsover? Drop leading 0's or anyhting like that?
- Is there any reason NOT to do this? There are many rows with content greater than 8 characters, but I frequently query on a type of entry that is 8 or less.
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| Why Does the Transaction Log Keep Growing or Run Out of Space? Posted: 17 Aug 2013 06:22 PM PDT This one seems to be a common question in most forums and all over the web, it is asked here in many formats that typically sound like this: In SQL Server - - What are some reasons the transaction log grows so large?
- Why is my log file so big?
- What are some ways to prevent this problem from occurring?
- What do I do when I get myself on track with the underlying cause and want to put my transaction log file to a healthy size?
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| Partitioning a table will boost the performance? Posted: 17 Aug 2013 10:37 AM PDT I have a very large table approx 28GB and that is continually increasing. I am thinking about partitioning my table. The table is InnoDB and The File Per Table is enabled I have a field name created which is an integer field and stores the timestamp so I was thinking about creating the table like this: ALTER TABLE TABLE_NAME PARTITION BY RANGE (created) ( PARTITION p0 VALUES LESS THAN (1325356200) ENGINE = InnoDB, # Data before 2012 PARTITION p1 VALUES LESS THAN (1333218600) ENGINE = InnoDB, # Data for JAN,FEB,MARCH YEAR 2012 PARTITION p2 VALUES LESS THAN (1341081000) ENGINE = InnoDB, # NEXT THREE MONTH DATA FOR YEAR 2012 PARTITION p3 VALUES LESS THAN (1349029800) ENGINE = InnoDB, # NEXT THREE MONTH DATA FOR YEAR 2012 PARTITION p4 VALUES LESS THAN (1356978600) ENGINE = InnoDB, # NEXT THREE MONTH DATA FOR YEAR 2012 PARTITION p5 VALUES LESS THAN MAXVALUE # DATA for Next years ) ;
I have partitioned the year 2012 in Quarters(As it is our requirement) and will also do the same for year 2013 but not done here. Questions: - Does partitioning boost INSERTs and SELECTs Performance
- How much time the ALTER take as it is a huge amount of Data(Any way to minimize the Alter time)?
- Do I need to use the field created in the queries so that the optimizer can use the partition?
- Are there any limitation's or risks by partioning this table?
- Is there any way to ALTER the table without downtime?
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