Here's a practical, minimal guide for using GDB in Ubuntu terminal — from launching to setting breakpoints and navigating your code. 🧰 Step 1: Compile with Debug Symbols Use -g and disable optimizations ( -O0 preferred for debugging): bash Copy Edit g++ -g -O0 -o myprog myprog.cpp 🚀 Step 2: Launch GDB bash Copy Edit gdb ./myprog You'll see a (gdb) prompt. 🎯 Step 3: Set Breakpoints You can set breakpoints in three main ways : ✅ a. At a function gdb Copy Edit (gdb) break main ✅ b. At a specific file and line gdb Copy Edit (gdb) break myprog.cpp:42 ✅ c. At a method in a class gdb Copy Edit (gdb) break MyClass::doSomething If the symbol is mangled (C++), GDB usually demangles automatically, especially if compiled with -g . ▶️ Step 4: Run the Program gdb Copy Edit (gdb) run 🧠Step 5: Navigate Command Meaning next or n Step over current line step or s Step into function call finish Run until current function returns continue or c Continue until...
Query: In pgadmin foreign key defn wht is deferable, defered, validated, auto FK index, match (full/simple)? ----- ChatGpt response: When defining a foreign key (FK) in pgAdmin (or directly in PostgreSQL), the following options are available: 1. DEFERABLE & DEFERRED These options control when the foreign key constraint is checked during a transaction. DEFERRABLE: Allows the foreign key check to be deferred until the transaction ends . Useful for complex transactions where you might insert/update related rows before enforcing constraints. If not specified, the foreign key is NOT DEFERRABLE (checked immediately). DEFERRED: Applies only if the foreign key is DEFERRABLE . If set, the constraint is checked at the end of the transaction instead of immediately . 🔹 Example: sql Copy Edit ALTER TABLE orders ADD CONSTRAINT orders_customer_fk FOREIGN KEY (customer_id) REFERENCES customers (id) DEFERRABLE INITIALLY DEFERRED; This allows inserting an order referencing a customer_id ...