Oracle8i Internal Services for Waits, Latches, Locks, and by Steve Adams

By Steve Adams

This concise booklet comprises distinctive information regarding Oracle internals -- info that isn't on hand to Oracle shoppers. It lays a beginning for complicated functionality tuning of the Oracle database. in response to Oracle8i unencumber 8.1, the booklet describes lots of the secrets and techniques of Oracle's inner prone: info constructions, algorithms, and undocumented Oracle procedure data. major themes comprise waits, latches, locks (including example locks, utilized in parallel server environments), and Oracle's use of reminiscence. Oracle8i inner companies is aimed specifically at directors and builders who desire certain inner info to do complex functionality tuning. The e-book will extend your repertoire of tuning ideas and troubleshooting ideas by way of explaining how one can use Oracle's hidden parameters and undocumented process records to most sensible virtue.

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Additional info for Oracle8i Internal Services for Waits, Latches, Locks, and Memory

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The ANSI committee called X3H2 had been charged with the task of proposing a relational language. The first standard was published in 1986; it was based essentially on IBM's version of SQL. Today, there are many implementations of SQL, but there are only a few that are t9tally compatible with the ANSI standard, including SQL/DS and DB2. In all that follows, we shall consider Oracle's implementation of that standard. So, each time that we mention SQL, this should be interpreted as Oracle's SQL. In this chapter we will give an example of a database that will be used in the subsequent chapters.

A database administrator may also grant a user the facility to connect himself directly without having to mention his password. The syntax is as follows: GRANT CONNECT TO OPS $ IDENTIFIED BY pass_word; The IDENTIFIED BY clause is only obligatory when a new user is created or to alter the password of an existing user. It is also possible to create or assign the same privileges to a set of users in one and the same command. 1 I) Creation of a new user ac1 with the password 'aclpwd' with the right of connection only.

This type defines a pseudo column (internal) that identifies a line in a table. The columns in a table may not be of this type • LONGRAW: like RAW. 1 The following command creates a table for the client entity in our basic example. We shall assume that the client number (clientid) is the entity identifier. For this reason, it is defined with the NOT NULL option. It should be noted that this single condition is insufficient to guarantee the uniquenes of clients (see creating an index). CREATE TABLE Client (clientid NUMBER(6) NOT NULL, 28 Oracle name CHAR(20), address CHAR(80), postcode CHAR(6), town CHAR(lO), tel NUMBER (10) , specterm CHAR(50)); Second form.

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