SQLiteDebug.java revision c3849200fa60b22ea583ba2a6f902d6a632a5e7e
1/* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.database.sqlite; 18 19import java.util.ArrayList; 20 21import android.util.Log; 22 23/** 24 * Provides debugging info about all SQLite databases running in the current process. 25 * 26 * {@hide} 27 */ 28public final class SQLiteDebug { 29 /** 30 * Controls the printing of SQL statements as they are executed. 31 */ 32 public static final boolean DEBUG_SQL_STATEMENTS = 33 Log.isLoggable("SQLiteStatements", Log.VERBOSE); 34 35 /** 36 * Controls the printing of wall-clock time taken to execute SQL statements 37 * as they are executed. 38 */ 39 public static final boolean DEBUG_SQL_TIME = 40 Log.isLoggable("SQLiteTime", Log.VERBOSE); 41 42 /** 43 * Controls the printing of compiled-sql-statement cache stats. 44 */ 45 public static final boolean DEBUG_SQL_CACHE = 46 Log.isLoggable("SQLiteCompiledSql", Log.VERBOSE); 47 48 /** 49 * Controls the stack trace reporting of active cursors being 50 * finalized. 51 */ 52 public static final boolean DEBUG_ACTIVE_CURSOR_FINALIZATION = 53 Log.isLoggable("SQLiteCursorClosing", Log.VERBOSE); 54 55 /** 56 * Controls the tracking of time spent holding the database lock. 57 */ 58 public static final boolean DEBUG_LOCK_TIME_TRACKING = 59 Log.isLoggable("SQLiteLockTime", Log.VERBOSE); 60 61 /** 62 * Controls the printing of stack traces when tracking the time spent holding the database lock. 63 */ 64 public static final boolean DEBUG_LOCK_TIME_TRACKING_STACK_TRACE = 65 Log.isLoggable("SQLiteLockStackTrace", Log.VERBOSE); 66 67 /** 68 * Contains statistics about the active pagers in the current process. 69 * 70 * @see #getPagerStats(PagerStats) 71 */ 72 public static class PagerStats { 73 /** The total number of bytes in all pagers in the current process 74 * @deprecated not used any longer 75 */ 76 @Deprecated 77 public long totalBytes; 78 /** The number of bytes in referenced pages in all pagers in the current process 79 * @deprecated not used any longer 80 * */ 81 @Deprecated 82 public long referencedBytes; 83 /** The number of bytes in all database files opened in the current process 84 * @deprecated not used any longer 85 */ 86 @Deprecated 87 public long databaseBytes; 88 /** The number of pagers opened in the current process 89 * @deprecated not used any longer 90 */ 91 @Deprecated 92 public int numPagers; 93 94 /** the current amount of memory checked out by sqlite using sqlite3_malloc(). 95 * documented at http://www.sqlite.org/c3ref/c_status_malloc_size.html 96 */ 97 public int memoryUsed; 98 99 /** the number of bytes of page cache allocation which could not be sattisfied by the 100 * SQLITE_CONFIG_PAGECACHE buffer and where forced to overflow to sqlite3_malloc(). 101 * The returned value includes allocations that overflowed because they where too large 102 * (they were larger than the "sz" parameter to SQLITE_CONFIG_PAGECACHE) and allocations 103 * that overflowed because no space was left in the page cache. 104 * documented at http://www.sqlite.org/c3ref/c_status_malloc_size.html 105 */ 106 public int pageCacheOverflo; 107 108 /** records the largest memory allocation request handed to sqlite3. 109 * documented at http://www.sqlite.org/c3ref/c_status_malloc_size.html 110 */ 111 public int largestMemAlloc; 112 113 /** a list of {@link DbStats} - one for each main database opened by the applications 114 * running on the android device 115 */ 116 public ArrayList<DbStats> dbStats; 117 } 118 119 /** 120 * contains statistics about a database 121 * @author vnori@google.com (Your Name Here) 122 * 123 */ 124 public static class DbStats { 125 /** name of the database */ 126 public String dbName; 127 128 /** the page size for the database */ 129 public long pageSize; 130 131 /** the database size */ 132 public long dbSize; 133 134 /** documented here http://www.sqlite.org/c3ref/c_dbstatus_lookaside_used.html */ 135 public int lookaside; 136 137 public DbStats(String dbName, long pageCount, long pageSize, int lookaside) { 138 this.dbName = dbName; 139 this.pageSize = pageSize; 140 dbSize = (pageCount * pageSize) / 1024; 141 this.lookaside = lookaside; 142 } 143 } 144 145 /** 146 * return all pager and database stats for the current process. 147 * @return {@link PagerStats} 148 */ 149 public static PagerStats getDatabaseInfo() { 150 PagerStats stats = new PagerStats(); 151 getPagerStats(stats); 152 stats.dbStats = SQLiteDatabase.getDbStats(); 153 return stats; 154 } 155 156 /** 157 * Gathers statistics about all pagers in the current process. 158 */ 159 public static native void getPagerStats(PagerStats stats); 160 161 /** 162 * Returns the size of the SQLite heap. 163 * @return The size of the SQLite heap in bytes. 164 */ 165 public static native long getHeapSize(); 166 167 /** 168 * Returns the amount of allocated memory in the SQLite heap. 169 * @return The allocated size in bytes. 170 */ 171 public static native long getHeapAllocatedSize(); 172 173 /** 174 * Returns the amount of free memory in the SQLite heap. 175 * @return The freed size in bytes. 176 */ 177 public static native long getHeapFreeSize(); 178 179 /** 180 * Determines the number of dirty belonging to the SQLite 181 * heap segments of this process. pages[0] returns the number of 182 * shared pages, pages[1] returns the number of private pages 183 */ 184 public static native void getHeapDirtyPages(int[] pages); 185 186 private static int sNumActiveCursorsFinalized = 0; 187 188 /** 189 * Returns the number of active cursors that have been finalized. This depends on the GC having 190 * run but is still useful for tests. 191 */ 192 public static int getNumActiveCursorsFinalized() { 193 return sNumActiveCursorsFinalized; 194 } 195 196 static synchronized void notifyActiveCursorFinalized() { 197 sNumActiveCursorsFinalized++; 198 } 199} 200