# ERASED TEST, YOU MAY BE INTERESTED ON maths

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maths Description: miscellanous grab-bag Author: noob saibot Other tests from this author Creation Date: 14/09/2024 Category: Computers Number of questions: 6 |

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define the stages of 2-phase locking growth shrinkage. match pushdown automata and finite state machine pushdown automata FSM. how to tell if the determinant of a 4 x 4 matrix is 0 hint: If two rows of a matrix are equal, its determinant is zero. This is because of property 2, the exchange rule. On the one hand, ex changing the two identical rows does not change also, If a matrix contains either a row of zeros or a column of zeros, the determinant equals zero. If 2 rows or columns are the same, the determinant also equals zero A- the matrix has two proportional rows B- the product of the elements of the main diagonal is equal to zero C- the 1st row of the matrix is formed by consecutive integers D- the product of the elements of the 1st row is equal to the product of the elements of the 4th column. Indicate the correct statement regarding Jacobi's rule. This is related to the properties of determinants. Specifically, adding or subtracting a multiple of one row or column to another row or column does not change the determinant of the matrix. A-Jacobi's Rule states that a matrix will be symmetric when all elements diametrically opposed by the main diagonal are equal. B- Jacobi's Rule states that when a matrix is multiplied by a scalar (any real number), its determinant will be multiplied following the rule. C- Jacobi's Rule states that an inverse matrix has all elements of the main diagonal equal to 1 and all elements outside the main diagonal equal to 0. D- Jacobi's Rule states that the determinant does not change when a change is made to the matrix, such that a row or column is added or subtracted from any other row or column of the matrix. E- Jacobi's Rule states that the inverse matrix of a square matrix A is one that, when multiplied by matrix A in any order, produces the identity matrix. tell me about the following terms to mitigate deadlock in dbms: shared lock exclusive lock 2-phase commit 3-phase commit. match up. note: Dirty Reads allow transactions to read uncommitted changes, whereas Non-Repeatable Reads occur after a committed change by another transaction. Phantom Reads happen when the set of rows a query returns changes due to inserts or deletes by another transaction, while Non-Repeatable Reads involve changes to the same rows. Lost Updates occur when concurrent transactions overwrite each other's changes, while Incorrect Summary arises from issues with aggregate operations during concurrent modifications. Phantom Reads dirty reads lost update Non-Repeatable Reads Incorrect Summary. |

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