Types of locking in sql server
Types of locking Locking is the way that SQL Server manages transaction concurrency for multi-user environment. A lock as an in-memory structure is 96 bytes in size. How to check locking or DMV for...
Category: performance tuning
What is Blocking
Blocking occurs when one or more sessions request a lock on a same resource, such as a row, page, or table. when one connection holds a lock and another second connection also requires a...
Lock Escalation for Sql Server
Lock escalation is the process of converting many fine-grained locks (such as row or page locks) into table locks. When many locks created on the same table’s row in Same session the Sql Server...
SQL Server – Lock Timeout
Lock Timeout event indicates that a request for a lock on a resource, such as a page, has timed out because another transaction is holding a blocking lock on the required resource. Time-out is...
Transaction Isolation Levels
1. Dirty Read: when uncommitted data reads. Let’s say tran-1 updates a row within transaction but it’s not committed and another tran-2 reads the updated row after that tran-1 rollback but tran-2 already...
Transactions
Transactions are set of tasks for single execution, it have has only two way success or failure and If any of the tasks fail, then transaction will fail else success. Transaction has two action...
ACID Properties in SQL Server
Atomicity: In Simple word say in side transaction’s all operation (insert, update, delete) is either successfully committed or rolled back, it is never allow to some transaction committed and rollback. Consistency: it is provide...
Window Functions
What is Window Functions In simple terms window or ranking functions execute on set of rows and return a single aggregated value for each row. Window functions using an OVER() clause but OVER() optional...
Data Partitioning
Partitioning is a techniques where we can divided any database object into multiple parts like Table, Index etc. What is a table partitioning? Table Partitioning is a way where very large table divided into...
Table Variables
What is Table Variables Table variables like variable, its creating as variable like DECLARE statement. Table variable table’s schema create in tempdb database and data store in Memory and its name start with hash...
Local temp table and Global temp table
What is Local temp table and Global temp table Temp tables are like a physical table but it’s always creating in tempdb database and its name start with hash (#), It’s automatically drop when...
Common table Expression (CTE)
What is Common table Expression Common table expression (CTE) is a temporary result set and store the result set like normal view that can be use within a SELECT, INSERT, UPDATE, or DELETE statement....
Table Type and Table Valued Parameters
What is User-Defined Table Types User-Defined Table Types (UDTTs) is a kind of user defined data type its can be pass as a parameter in procedure where we need to pass multiple rows and...
Correlated and Subqueries
What is SQL Query SQL is a Standard Query Language for storing, manipulating and retrieving data in databases. SQL is a programming language(Query programing language) like PHP, Java, .net etc language use for application...
Derived Tables – Sql server
Derived Tables are similar to table variables it’s exist in memory only many deferent is table variable need to declare and derived table always create within a select statements, its also called to Subsquery....
Merge Statement
MERGE statement generally used in warehouse ETL process where we need to perform multiple operations like insert, update and delete data in target table based source table. MERGE statement joins target to source by...
Auto Increment Functions
we have mainly 4 ways for get last identity (auto increment) values after an INSERT, SELECT INTO, or bulk copy operation. Like @@identity, scope_identity, ident_current and identity but there are a few differences between...
About Author
MM (Mishri Mal) Gehlot MM Gehlot is a technology expert and working as a database engineer since 10+ years that revolve managing very large Database’s locking, blocking, performance issue,indexes analysis & optimization using data...
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