Questions tagged [temporary-tables]

The use of temporary table objects (not table variables) including semantics, design, performance optimization, and indexing. See also [table-variable].

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Oracle Global Temp table - data is truncated but the table remains in the DB ! is this an expected behavior or a configuration?

We are trying to create global temp table using Create global Temporary table t1 ( id NUMBER, description VARCHAR2(20) ) ON COMMIT Delete Rows; and trying to drop it at the end manually but ...
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Query to filter a table based on a comparison applied to the same table?

Case & Problem: Consider a corporate building with some rooms and departments that need authorization to enter. Employees have to scan their badges to be authorized. If the employee is inside (...
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Allocating Hours From Operations Table to Available Hours in Availability Table

I have a scheduling problem… The database is SQL Server 2017. The data comes from one Table and one View… Operations_TBL Operation_ID Resource_ID_Link Operation_Start_By_Date ...
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MySQL - Can we use the same temporary table name in different stored procedure?

In our database, we generate statistics by periodically calling a large number of stored procedures in the event. Considering there are two SP auto_update_daily_users auto_update_daily_orders Is ...
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Allocating Rows From One Table to Available Date Range in Second Table

I designed a Shop Floor Scheduling System and it’s been running well for years, but the managers are now asking for something more precise and what they are asking for puts me outside my comfort zone. ...
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Use Common Table Expression (CTE) to reduce locks (max_locks_per_transaction)

I am getting "ERROR: out of shared memory" presumably because my plpgsql function drops/creates a lot of temporary tables. Searching for a solution to the issue, I found this answer that says: ...
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1answer
45 views

Why can't temporary tables reference regular (non-temp) tables in PostgreSQL?

Why can't temporary tables references non-temp tables in PostgreSQL? When I run the following CREATE TABLE foo ( a int PRIMARY KEY ); CREATE TEMP TABLE bar ( a int REFERENCES foo ); I get, ERROR:...
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55 views

What types of locks are held on global temporary tables?

I am wondering if: the isolation level is Read Committed data is inserted or deleted or read are the same locks (shared for reading and exclusive for insert/delete) used for global temporary table ...
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Using `min_active_rowversion` for global temporary tables

I use global temporary tables for easy integration testing of my SQL Server backed application. But the function min_active_rowversion does not seem to include global temporary tables, like seen ...
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1answer
159 views

How to create and fill multiple session temp tables with dynamic SQL?

I have a column that holds JSON data. The table can be filtered for sets of similar JSON data that will have mostly identical JSON keys in the JSON column. I can dynamically collect the set of JSON ...
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283 views

logical reads on global temp table, but not on session-level temp table

Consider the following simple MCVE: SET STATISTICS IO, TIME OFF; USE tempdb; IF OBJECT_ID(N'tempdb..#t1', N'U') IS NOT NULL DROP TABLE #t1; CREATE TABLE #t1 ( r int NOT NULL ); IF OBJECT_ID(N'...
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Safe to use the same temporary table name in parallel transactons?

Using postgreSQL 10 or 11, would it be safe creating temporary tables with the same name, each carrying different data? I do not intend to share the data between any sessions/connection/transactions. ...
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117 views

executing SQL query with temp tables using 1.6jdk

I created a batch to run a query that has temp tables as the below example IF OBJECT_ID ('tempdb..#TEMP1') IS NOT NULL DROP TABLE #TEMP1 select * into #TEMP1 from cutomer IF OBJECT_ID ('tempdb..#...
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1answer
380 views

How to clear temp database content in SQL Server?

As the title implies, I am going to clear the content of my temp database in SQL Server. SolarWinds is generating a critical alert and I want to clear the tempdb workfiles and worktables. How can I ...
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How to inspect global temp table from outside the transaction it is created in

To help debugging a batch of SQL (that is run inside a transaction), inside the transaction I dump some data into a global temporary table. The global temporary table is created inside the transaction ...
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PostgreSQL Optimize bulk values CTE and SELECT INTO TEMP TABLE to prevent OOM kills

Recently we moved some code from Rails way to raw SQL for performance reasons. We have some jobs which fetch some data from APIs, data can be in 100K+ rows of count sometimes. This data needs to be ...
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MariaDB Spider Engine UDF spider_bg_direct_sql can't find TEMPORARY table

I am testing the Spider engine in MariaDB. In version mariadb-10.1.12-linux-x86_64 the UDF works, but there are some issues so I want to upgrade to a newer version. However, mariadb-10.2.18-linux-...
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642 views

Does LocalDB support temporary tables?

Are SQL Server temporary tables (prefixed with #) supported in LocalDB instances?
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MySQL 8 using the wrong tmp directory

I have a query like so... INSERT INTO table3 SELECT DISTINCT * FROM table1 LEFT JOIN table2 on ... And it uses a temp table. The query runs for about 60 seconds, then starts filling /tmp even ...
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INNER JOIN is extremly slow on some rows and create temp table

The MySQL query SELECT `p`.*, `p.Author`.* FROM `post` AS `p` INNER JOIN `user` AS `p.Author` ON `p`.`userid` = `p.Author`.`userid` WHERE ( ( `p`.`threadid` = 29780 ) AND ( `...
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1answer
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Temp tables not being created in SQL Server Azure [duplicate]

I have created a stored procedure that creates multiple temp tables for use in the sproc and then drops them at the end of the sproc. The problem I am encountering is I can execute the stored ...
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“The transaction log for database 'tempdb' is full due to 'ACTIVE_TRANSACTION'.” after adding indexes to temp tables

Recently, I added some indexes on temp tables to procedures which prepare data for data warehouse. On a testing db, tests of these procedures worked fine but when running on client's server it failed ...
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1answer
887 views

Performance difference between Text and Varchar in Mysql

I was experimenting with text and varchars in mysql 5.7. I create a simple mysql table as below CREATE TABLE small_table ( pk int(11) NOT NULL AUTO_INCREMENT, varc varchar(255) DEFAULT NULL, txt ...
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1answer
41 views

Finding temporary table name in MariaDB

As I reported some days ago to MariaDB bug tracker the following bug: https://jira.mariadb.org/browse/MDEV-17420, slave replicas with version 10.2.x are leaking temporary tables on MyISAM files. Our ...
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2answers
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mysql - calculate traffic for tmp tables

I'm thinking of placing tmpdir to SSD - to increase speed of working with sorting data in tmp tables on disk. Our base creates a lot temporary tables on disk during sorting, merging, joining an so on. ...
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1answer
15 views

Dropping rows based on the previous selection statmnet

I have a database with following tables: temp_1, temp_2.... and cached_tbl. Inside cached_tbl I have column table_name and in corresponding rows I store all the temp table names I mentioned above. SO ...
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1answer
280 views

Truncating TEMP table before insert leads to big amount of logical reads on TEMP TABLE

Setup: We have a complex set of queries, that runs quite often (about 3000 times per hour) for different users. At the start of the process, .NET application creates a set of temp tables during the ...
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1answer
239 views

Why do LocalTemp table showing with lengthy underscore under Temporary Tables of tempdb in SSMS 2017 Express Edition? [duplicate]

In my Microsoft SQL Server 2017 Express Edition, I have created a local temp table using below create statement, create table #localtemptable (tempid int,tempname varchar(20) ) After creating #table,...
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1answer
120 views

Reasons for not Globally enabling Trace Flag 2453 - Cardinality on Table Variables

I've been doing some reading on the improvements that Trace Flag 2453 can give on the performance of Table Variables by maintaining statistics and was wondering what would be the reasons you would ...
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2answers
123 views

Temp Table Filtered Index Creation is Blocked When Stored Procedure is Run Multiple Times Concurrently

Are there any known blocking issues in SQL Server 2014 that are specific to creating one or more filtered indexes on a temp table after the initial table creation? (i.e. not an inline index creation) ...
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Why does the Select statement stalls when executed directly in sequence?

When executing the following in workbench or in code, the Drop table/Create Table works ok. The Select statement stalls when executed in one go. If the table is MyIsam, it works ok. If executed [...
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1answer
2k views

MS SQL Server: Do multiple queries in a batch ever execute in parallel and if so what happens when the second query is dependent on the first?

If I have a batch of two different SELECT statements, is it possible for them to be executed in parallel (if the SQL Optimizer deems it to be the most efficient execution method)? If the first SELECT ...
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1answer
34 views

How to get the consolidated ServiceID with the sum of File Size associated with over an year

Can anyone please help me on below to get the consolidated ServiceID with the sum of File Size associated with it over an year. Complete Code (For reference) If(OBJECT_ID('tempdb..#temp1') Is Not ...
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761 views

Where is `pg_temp` documented in the PG manual?

I have tried various ways to search for pg_temp in the manual, but could not find it. Is it documented in the manual?
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2answers
323 views

How to get around not being able to use Temp Tables in Functions?

So, to get straight to the point. A Client wants to be able to view all of their staff of a certain position are going to be available to perform a set of shifts between 2 dates. Seems simple, have a ...
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1answer
663 views

mysql memory temp table creation SLOW

I'm trying to get to the bottom of what I'm thinking is a performance issue when creating in memory temporary tables. The underlying query I have looks to me to be pretty well optimized. The explain ...
5
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1answer
614 views

Why is it not possible to create indexes on temp tables in SNAPSHOT isolation?

When I try to create indexes on a temporary table in SQL Server when using the SNAPSHOT transaction isolation, I get this error: Transaction failed because this DDL statement is not allowed inside ...
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2answers
2k views

Can multiple instance of procedure create same #Temp simultaneously?

I have a procedure which is inserting data into #temp table. After performing certain manipulations to the data, it store data from #temp table to some other table. I cannot run multiple instance of ...
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1answer
148 views

Tempdb size strategy

I've recently started my role as a DBA and my initial task has been to take ownership and redeploy a database provided by a 3rd party to help us conform to GDPR legislation. As a consequence, I've ...
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Temporary tablespace size in 12C

I have installed 12C and importing data through sqlldr , but it increases the temporary tablespace size tremendously which causing the oracle shutdown. Please help and guide me what to do to get rid ...
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1answer
512 views

How to find index details on Temporary tables in SYBASE

I am a layman in SYBASE world. In order to improve performance, I am creating indexes after data load of temporary tables in many stored procedures. Say, one proc A has an insert into temporary ...
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3answers
481 views

I ran MySQLTuner and wondered if anyone would go over the results with me, specifically query cache and temporary tables

Here are the results of MySQLTuner: [--] Skipped version check for MySQLTuner script [OK] Logged in using credentials from debian maintenance account. [OK] Currently running supported MySQL version 5....
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2answers
639 views

Issue while trying to insert the values into a temp table from a query

Please help me on below . I am trying to insert values into a temp table using the sql query. But I am facing below errors . Please help me understand the mistakes. Errors I am facing : Database ...
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1answer
52 views

New Analyst SQL Optimization - Multiple Spools

Unfortunately my ability to Query has outgrown my knowledge of SQL Optimization, so i am hoping someone would help a young analyst by looking at this atrocious execution plan and provide some wisdom ...
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1answer
294 views

How to check if a PostgreSQL table is temporary?

How can I write a query to check if a PostgreSQL (10.x) table is a temporary table? I looked at the pg_class system table, but couldn't find any column about whether the relation is temporary. ...
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664 views

How to put an execution time limit for MySQL Temporary table creation

We can use SET MAX_EXECUTION_TIME=10; statement to stop the execution of a SELECT statement, if it took more than 10 milliseconds to execute the query. But the same wont work for other statements like ...
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1answer
114 views

INSERT MASTER.sys.sysdatabases result into a temporary table

I have this query that iterate all databases on my SQL Server DECLARE @DB_Name varchar(100) DECLARE @Command nvarchar(200) DECLARE database_cursor CURSOR FOR SELECT name FROM MASTER.sys....
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274 views

DELETE … IN hangs after deleting half of a large table (even for deleting 10 rows)

I'm having trouble with a DELETE hanging, even for a small number of rows (10) in a large MariaDB InnoDB table. Background I had a large table (~400,000,000 rows) that needed to have rows archived ...
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1answer
567 views

MEMORY_OPTIMIZED table as replacement for temporary tables

I use temporary tables for complex processing which is done in several "child" procedures. These procedures are working in the same session, so the temp tables are accessible for them. Is there a ...